A "Drawing Board"

I came up with an idea! There should be a place on the site called the "drawing board" in which you could sketch out ideas using your mouse and save them as a JPG. You could incorporate this into drawing plans and designs for your instructable! It could be a cool feature for everyone, but for pro membership you could have extra things (e.g. rainbow colors, a ruler, paint brush mode). I think this would be a cool addition to the website.

Topic by Jessie Marie   |  last reply


What is the best tutorial on making a drawing board?

I want to make a drawing board, but I don't know how. Where can I find an instruction on how to make a (professional) drawing board.

Question by DaTomassinoInc   |  last reply


what is the price of a digital drawing board/tablet/pad...?

I'm planning to buy one, =) can someone suggest me a good one?

Question by N.Khan   |  last reply


Drafting ruler.

I'm from estonia.  Local stores don't sell much different items as in bigger countries. So i'm missing many good things to DIY.   I need drafting board with straight  up and down movable ruler. 100% straight lines can't be done only by hand and ruler.  I have particle board and some L and U brackets.  Idea is do make drafting board  like this http://i.ebayimg.com/00/s/MTA1NFgxNjAw/z/0dEAAOxyeR9TF7AP/$_57.JPG Problem is ruler. I haven't found right ruler mechanism from stores. I think I need to make mechanism for ruler. How? With  fishing line like this http://ep.yimg.com/ay/draftingsteals-store/para-liner-delux-parallel-straightedges-by-alvin-3.gif I have also seen rollers and fishing line on ruler.  Fishing line under the board is way more better than on the board.  

Topic by DeathSuperMario   |  last reply


Help with CNC Control Board (HobbyCNC EZ Driver Board)

I purchased a HobbyCNC EZ Driver Board from hobbycnc.com and I have some questions on how to use it. The instructions say that I need to use a power supply that can provide 50% of the TOTAL current draw of the steppers. It also says that a 2.5A stepper will draw 5 amps. So if I have 3 steppers that say 1.3A on them does that mean I need a power supply that can provide at least 7.8 amps or? And finally, it says I have to adjust the current coming from the board to each stepper. It gives the equation: desired amps times (X) .14= Vref. So since I have steppers that say 1.3A on them do I use that for desired amps or am I supposed to use double that?????? Anyone who has used the HobbyCNC EZ Driver Board, PLEASE help I am very confused.

Question by Electronics Man   |  last reply


Printer Board is a CNC controller. ?

Can anyone pls show me link to subjects on this matter with minimum need for programming langauge ? my perception is that if we can make printer draw a picture without waiting for ink signal; then cartridge can easily be replaced with a curring blade, torch or drill...is it possible to pinpoint the pin that sends ink OK back to printer and connect it direct to +VE so that it give ink available always. please help me work on this project. Again if possible with min or no programming... thanks

Question by goldenshuttle   |  last reply


DIY foam board to build castles. Needc help for drawings.

Hi. Long time ago, I used to make rooms for playing games (like space hulk :) ) using foam board. Foam board is just styrofoam with paper glued on it. So, if we hade a PDF file that we could print and glue on styrofoam, we would have easy something that is very cheap, and we'd just to cut and put a little bit of adhesive tape to make nice looking things. This could include : -Castles (every body like castles) -Making a small version of your own home -Making some real-life map of doom (code is open now, I hope textures are too). Is someone interesting in making some plans with me, and helping for the texture, so we could make an instructable ? Regards, tReg.

Topic by treg   |  last reply


My RC car circuit board

Hi, i need some help. A few weeks ago i took apart a RC (remote controlled) car circuit board but some of the cables couldn't hold and just broke off so i'd be so thankful if one of you smart people out there could tell me (or draw on the picture) where everything is supposed to go (including the antenna :-) and the forwart and backward motor. thanks Kacper

Topic by kacper00100   |  last reply


How to make a circuit board?

I have bought an assortment of resistors and capacitors and circuit board s, but how to make Circuit board I need to make a circuit board for a project. It is all 12vdc, I have a 1a fan and a 6a thermoelectric device one setting 1, plus another 6a on setting 2, and a 3rd on setting 3 So 1 is 7a 2 is 13a 3 is 19a How to make the board. . Also a second device has the 1a fan plus a 4watt element, plus another 4w on setting 2, plus another 4w on setting 3 So 1 is 1a and I think 0.4a= 1.4a 2 is 1.8a 3  is 2.2a. I think I need to know what components to use, Right now I have each portion wired directly to the switch which is directly wired to the battery. I have burned out one of the 4watt units (I assumed it would just draw the power it needed) so I don't want anything else to burn out. Eventually I wanted to have a rotary multiple switch controlling both sets with a neutral in the middle (if I can find it) Printing a circuit board is next to learn,  but I already bought several boards and various assortment of components, just don't know which ones to use Also where to buy this.       12vdc 20a 7 position off in center rotary multiple switch for sale

Question by Johnieahenderson   |  last reply


18650 protection board limitations

Hi ThereI've been lucky enough to stumble across a large quantity of brand new 2600 - 3300mAh 18650 cells and I'm wanting to find some DYI projects to put them to good use. 200W flash light, electric Go Kart or a basic power wall comes to mind. However first things first Ill be needing to build them into a packs and connect them to protection modules but Ive got a few questions:Protection modules come in so many flavors. 2S - 3S - 4S - 5S - 5S5P and bigger.. Do you choose the module based on how many cells you have in total and then just use a DC-DC converter to get the required voltage? Or do you try to get as close as possible to the voltage needed in series first and then find a module that suits? What is the most versatile configuration?Can I connect 5S5P pack to a 5S module? Can I keep increasing in parallel with no consequences? Like for example can I connect a 5S15P pack to a 5S model and expect the module to be able to balance and charge the pack back up? I understand there are Amp draw limits to watch out for too. The module I was looking at is below.https://www.ebay.com/itm/191978019369Also this module requires a charge voltage of 21 volts at no more than 5Amps. Where would I be able to find a charger like that? A laptop power brick maybe?Any guidance would be great as I'm keen to learn as much as possible!Thanks in advanced!

Question by Plangy 


Motor triggered by a vibration sensor

Hi, my project consists of a vibration sensor that, when enabled, will trigger a motor which will function for a certain amount of time, then stop, and stay in this position as long as the sensor is detecting vibrations. When the vibrations stop, I need the motor to reverse polarity and function in the opposite direction,for the same amount of time as before then stop, and repeat... I'm a first year electrical engineer so please consider me a rookie in this field. If someone could provide me with a suitable electrical circuit, with names and values for the part, i think i might be able to draw the corresponding board. Thanks

Topic by julienfhd   |  last reply


can someone draw a thru hole board for RGB 10w LED with 12v input? Answered

12v input from car battery to power this LED   something swimilar to these 1 2 3 but cheap and simple cos i dont wanna use SMD some info   on LED and board

Question by turbiny   |  last reply


Some basic Power LED question for building a simple LED board Answered

This question is coming from a total rookie in the field of electronics, please keep that in mind :) I need to build a simple multi-LED board, but I lack some essential knowledge about electronics. The LEDs I need to use are 5W IR High Power LEDs: DC Forward Voltage (VF): 1.4V DC Forward Current (IF): 1400mA Maximum Pulse Voltage: 1.7V Maximum Pulse Current: 2000mA I would like to build on the board three pieces of this LED, with a momentary switch. And I just realised I will probably need some kind of "driver" circuit - whatever it is - to use the Power LEDs. I'd rather buy one from eBay, than make myself one :) Just need to know what type I need. The input voltage is a 12V DC battery. So long story short: could someone help me out with this simple LED board? How many "mAh" should the battery have  to power these three power LEDs for about 1,5 - 2 hours? I am aware of a 5W probably need some cooling, I will use a heatsink. If someone could draw me a circuit for this project I would be amazed :)

Question by arraxis   |  last reply


How would this schematic look on a circuit board?

I currently have this schematic for solar powering my Arduino board. I got this schematic directly off the instructable: https://www.instructables.com/id/Self-Sufficient-Arduino-Board/   I am a newbie to this kind of stuff and understand how circuit boards work but have spent hours trying to figure out how to correctly draw it like it was on a circuit board. I made a final attempt and drew it on a PCB circuit board template shown below. The components used are annotate with their polarity (the switch isn't cause it can go either way) and the red lines indicate the soldered connection. If someone could just check it out and make sure all the parts are right, it would be greatly appreciated. The main problem I have with it is the junction where the battery positive, switch and Arduino positive all meet. All help is greatly appreciated Thank you, Connor

Question by cobrien2115   |  last reply


EG7500 Inverter Drive Board Testing and Query?

Specification EG7500 Inverter Drive Board. PWM freq 40kHz. Overvoltage shutdown 15V +-0.5V. Low voltage buzzer beep 10.5 +-0.5. Undervoltage shutdown 9.5 +-0.5. Overcurrent shutdown 48mV. 1A Output current drive. Carry out a test by varying DC between 9V to 15V. Resulted: 1. At 10V to 10.5V buzzer beep. "OK" 2. At 9V to 9.5V or below 9V the unit shutdown. "OK" 3. At 13V to 13.5V ran into off and trying to restart the unit (Board marked A). "NG" 4. At 14.5V to 15V ran into off and trying to restart the unit (Board marked B). "OK" Refer to above test how to improve "Board Marked A" overvoltage shutdown?  Which part of the schematic to begin troubleshoot. What component I needs to change or improve?  Once power up. This unit draw ~0.5A on standby. How do I minimize the standby current? There are no temperature control since P3 "S8550" was not on board. Can I just put "S8550" on board and use PTC for temperature control? As proposed by schematic online, pin 4 fan control feet to ad 100uF to ground. How do I change this part to enable fan control once the temperature rise? How many FET this unit can drive with 1A at 40kHz? How to test the overcurrent shutdown? Thank you

Question by GearUp   |  last reply


How can a make a giant check? Answered

 I want to make a giant check to display in my room. I plan to use foam core board for the check. My problem is adding the graphics, lettering, ect. I dont want to hand draw it but I dont have photoshop. How can I design the face of it? I have paint.net as my photo edititing.

Question by imthatguy1125   |  last reply


Timing/warning device using Adrduino board?

Some time ago I bought some components with a view to trying to build a timer/warning device so that a boat driver can monitor session times on the water. To be honest I neither have the time or, as quickly became apparent, the expertise, to do it!! So I am posting on this forum in the hope that somebody may be interested in either taking on the project, or is able to put me in touch with someone who might. I would be happy pay a reasonable amount for somebody's time and expertise, and of course the components. Alternatively I am could trade some wakeboarding or waterski lessons for it! If just the components could be put together to make a functioning circuit, I can get the whole thing put into a suitable box. If it can be built successfully, I will actually need two. I have been told that it should not be difficult but it is certainly beyond my capabilities. I am in the UK. The device needs to have a countdown timer, with a display for the driver to see. It needs to trigger an audio and visual warning when getting close to a fifteen minute time limit and, when the time is up, to reset itself. It also needs to switch a fairly bright light which which will reflect these actions and can be seen from behind the boat . It was suggested that this could be based on an ARDUINO board. It would draw its power from the boat's 12v system. The sequence would be as follows: Timer is started by driver The digital timer display starts to countdown from 15 mins in seconds The boat driver will see from the display that the timer is running. A light bright enough to be visible to a person 20m behind the boat is illuminated so he/she also knows the timer is running. At 12 minutes, the driver gets a visual warning, maybe the display flashes, perhaps once per second. The person behind the boat also gets same warning on their light. i.e. flashing once per second. At 13 minutes 30 secs, the display flashes more rapidly and a buzzer also sounds for 10 secs. indicating to the driver that the time is almost up. The person behind the boat also gets the same warning on his light (i.e. rapid flashing) (may want to incorporate an audible warning too, loud enough for them to hear). At zero, the timer automatically resets itself to 15 minutes and restarts.  At this point the driver has the option to allow it to continue running without interruption for the next 15 minute period and so on, or he can stop the timer manually, when it will simply reset to 15 minutes and become idle until started again. N.B. A facility which allows the timings to be customized would be very useful (presumably this could be done by changing the Arduino code?) So thats it. Simples! (apparently) If you think you can help me with this and I will be delighted to hear from you. Many thanks Mike mirlyn

Topic by mirlyn 


Is a transformer that puts out 12VAC at 2.4 amps safe to use with a circuit that only draws 0.58amps? Answered

The circuit i attempting to drive is one from a plasma globe. I was not sure if the excess output of the transformer would "fry" components on the board

Question by firemanfu   |  last reply


Fpc Design

I need flexible strip for led lights. i contacted too many manufacturer in china. they all want gerber files. i tried to draw with eagle but i have no experience on that. they said it's a mess. is there any body who done that before anybody for help please...

Topic by korguncelik 


(home made lightbox) Keeping backlight on - which pins to bridge on monitor psu board

Thought id seek a bit of pro advice from the forums for my first post as im totally drawing blanks on this one!. i am trying to finish my custom lightbox made from an old hanns.g hh281 monitor. at the moment, when powered on, the backlight turns on then off after a few seconds as no pc signal is being received.  i have taken a picture of the connector to the main board as i cannot figure out which 2 pins to bridge to keep the ccfl backlights on :-( i was guessing one of the ground pin and the on/off  would work but didnt want to mess this up on the first go . any input would be a godsend! thanks all!

Topic by Aikon359   |  last reply


Non-stop Train Prototype

A train that doesn't ever stop or slow down? Sounds ridiculous (ly efficient). This design is a pretty interesting take on the concept, though liability issues and real-world feasibility will probably keep this from ever making it past the drawing board.Link

Topic by joshf   |  last reply


Multiple Arduino Uno I/O ports driving relay Answered

Understand that the Arduino Uno can output a maximum of 40mA each from its IO port. I used 2 IO ports each (4 in total for switching) to drive a 80mA relay. In this case, the Arduino Uno is powered by USB, which draws up to 500mA. It worked and it was left to switch for a few minutes on pulsed 10 seconds interval. However, the Uno board heats up to around 50-55 degrees centigrade. Will this damage the board?

Question by Fiorano   |  last reply


Which components and soldered to which?

I have bought an assortment of resistors and capacitors and circuit board s, but how to make Circuit board I need to make a circuit board for a project. It is all 12vdc, I have a 1a fan and a 6a thermoelectric device one setting 1, plus another 6a on setting 2, and a 3rd on setting 3 So 1 is 7a 2 is 13a 3 is 19a How to make the board. . Also a second device has the 1a fan plus a 4watt element, plus another 4w on setting 2, plus another 4w on setting 3 So 1 is 1a and I think 0.4a= 1.4a 2 is 1.8a 3  is 2.2a. I think I need to know what components to use, Right now I have each portion wired directly to the switch which is directly wired to the battery. I have burned out one of the 4watt units (I assumed it would just draw the power it needed) so I don't want anything else to burn out. Eventually I wanted to have a rotary multiple switch controlling both sets with a neutral in the middle (if I can find it) Printing a circuit board is next to learn,  but I already bought several boards and various assortment of components, just don't know which ones to use

Question by Johnieahenderson   |  last reply


Need Houston Builders

I have a project, im going to need someone who is good with arduino, someone with a working knowledge of electric motors and batteries, and people who wont give up if the drawing board needs to be cleared. More details on the project if you E-mail me. m.conner90@yahoo.com if i posted this is the wrong place, let me know or move it please. thanks everyone.

Topic by ShoneDemonscales 


XY Table

Hi, I am trying to make an XY table using SCC-32 controller board that is controlling Hitec Servos. I was wondering if anyone had an Idea on how I would use C# or any other serial compatible programming language to set up a User Interface where you can click on a " hidden grid" to draw your desired shapes. Thanks in advance John

Topic by jtcamp15 


The Thought Bunker #6

Huzzah! I would like to thank the poeple who viewed and commented on this forum for the first 5! I was gone for a while but now I'm back!Thanks! Hello, I am hosting a forum topic train. This one includes some thinking. But it's not math! It's the kind of thinking that you can laugh and talk about. So, what do you say? This week's Thought Bunker: What did the designer of the drawing board go back to when his original design was a failure? What do you think? Tell us!

Topic by chopstx   |  last reply


Vote for the Thanksgiving Reuse Challenge!

The Thanksgiving Reuse Challenge has closed for entries, but it's not over yet! Since this is a speed contest, the winners are determined by the readers' votes and pageviews.Here's how it breaks down:Rating Prizes:The five Instructables with the highest rating will win an Instructables Robot t-shirt. The Instructable with the highest rating will also receive a laser-engraved cutting board.Page Views Prize:The Instructable with the greatest number of pageviews will receive an Instructables Robot t-shirt and a laser-engraved cutting board.Random Prize:We'll conduct a random drawing from the remaining pool of entries, and one lucky winner will receive an Instructables Robot t-shirt and a laser-engraved cutting board.So go vote by rating the ones you like! Tell us which ones deserve the prizes!You can see the see the current standings here.

Topic by fungus amungus   |  last reply


time safe circuit

I'd like to make a time locking box that is equivalent in function to this:    http://www.thekitchensafe.com/ I was wondering if there's anyone out there that would be willing to draw up a circuit for it as electronics is not something that I know how to do.  I could do it with arduino but I don't really want to tie up the board that way.  I assume it uses solenoids to operate.   I'm also open to any other ideas/advice people have.  .  

Topic by csiebe   |  last reply


Do i need to use this output from my DC motor speed control board?

Hi With the goal of using the DC treadmill style motor that i have in a project (or two), i have baught a SCR speed control board. The circuitry of the control board has outputs for the armature and field coil (labeled "excitation"). But the motor that i have is a permanent magnet type (2 wires going in / out  - red and black - nice and simple). So i don't need the 'excitation' output. My question is whether the control board needs this to be used? Am i going to fry my brand new controller if i only draw current through the armature output? I could, for instance, put a resistive load accross this output to make it use just less than the output it's rated for. Here's more info on the parts in question: The speed controller is like this:  http://www.ebay.com/itm/DC-0-220V-Continuous-Adjustable-Dc-Motor-Speed-Regulator-Control-Board-1000W-/251600102759?pt=LH_DefaultDomain_0&hash;=item3a9488e567 or this:  http://www.ebay.com/itm/1x-DC-Motor-Speed-Controller-Adjuster1000W-AC110V-220V-Input-2A-3A-4A-5A-output-/321526825620?pt=LH_DefaultDomain_0&hash;=item4adc7e0294 The motor is either of the models on this page (i actually have one of each): http://www.ectrade.com/Auction/FreeSample/1931851586/Electric_treadmill_motor_DC-specific.html Thanks in advance. Peas

Question by balisticsquirel   |  last reply


Diy LED strip light powered from a solar powered battery bank (for painting/drawing at night)

I like to paint nightscapes and so far headlamps are not working so well for me. I used a portable light bar one night that worked well (on loan) but it was too heavy. I've been through stores looking for the right thing...and harbor freight came close. But I need something lighter weight and less expensive.  Two or three led lights don't cast enough light and 30 led storebought lights are too much light. I have a solar powered phone charger with battery bank (with usb connections) that I now plan to use as the portable power source. I plan to use a pringles potato chip tube as the light housing that can be attached by clips to my pochade (really a mod'd cigar box) on top of a camera tripod. I guess my main concern is weight on the box, so I thought running a cable off a power source hanging from the tripod would be more secure and less likely to fall in my palette (as has already happened). I need help figuring out the circuit board; and also choosing the right white led for color purposes. Any thoughts?

Topic by sreudianflip 


I need help with my little idea? Answered

I am totaly useless with electronics but I had this brainwave witch involves accelerometer, some led diodes. I just need some drawing or blueprint. I need to know what does it goes with them. Basic idea is to make the led go flashing when accelerometer stops moving and it does stop flashing when it is in complete stop or moves forward. And do I need a board for it or I can weld all of it together?

Question by okursitis   |  last reply


How do you favourite something now?

This new design of the website is probably the most user unfriendly I've come across in a long time, how do you favourite something now? There used to be an obvious Favourite button at the top of an instructable page, there's just a row of icons now on the left that do nothing! I think you need to go back to the drawing board if you're going to keep this layout, and make it a bit more intuative, better yet, go back to the older version!

Question by MikeyD4   |  last reply


I am building a TV lift with (hopefully?!) RF and dpdt switch in parallel. But my wiring is not working as expected...?

I have the hard wired dpdt switch wired as attached and the relay as per the other attachment (but the incoming voltage to power the board and running through the relays to power the actuator are both 12v and from the same source). I am trying to have both a RF control and hard wired back up in the event of battery failure of controller or unit loss. Both items work fine when wired up to the actuator alone but when put in parallel there is a real issue with nothing happening. It seems like there is a open circuit which is drawing a large current from the transformer but not doing anything with it. I think it may have destroyed the relays on the board though - no, no fuse in the system less that on the transformer :-(  I just cannot see the problem but I have found another wiring diagram (also attached but with an actual board shown on it) where there seems to be a whole lot less wiring but  I dont know if this will achieve what I need to do. I do not want to destroy another relay board by experimenting so would be eternally grateful for a little advice. Can anyone assist, I am not an electronics expert but a mechanical engineer (could never get my mind around what I could not see!!)?  

Question by intrance   |  last reply


is this right? trying to set up 6 servos to arduino uno...

I am new at this and i suck!!! i am trying to run 6 hobby servos to my arduino uno- i am powering it with an external power source (12v adapter) and on my bread board all servo blk/red wires to the power + and the ground to -. The power on the bread board is going onto the vin diode on my arduino, neg to the ground on my arduino and all the other color wires from the servos to the numbered diodes on the arduino. Is that right? every time i run it i get the "because a USB was drawing too much power from your computer" response.  i know the 12v is a bit excessive to power up the servos, but does anyone know a better approach this? much appreciated let me know thanks, makemelook

Question by makemelook   |  last reply


Arduino/Servo Pan/Tilt: What pins?

I am new to electronics, not to mention micro-controllers. I & my son-in-law, have both bought Arduino boards. I have the Mega2560 & he bought the Make Ultimate Micro-Controller Pack with Netduino & Uno R3 (on sale at Micro-center for $14). I have found several servo libraries/sketches for controlling 2 servos, however, I can't find any actual schematics, eagle files, layout drawings, instructions on how to wire the motors to the Arduino! Can some one help??

Question by AptPupil   |  last reply


Raspberry PI power?

Hey yall! I just recently bought a Raspberry Pi! Those of you who want to order know how hard this is, so Im pretty excited because i didnt think Id b able to order for awhile. Anywho, I wnat to make or buy a portable power supply for it, but I am not sure how to go about doing that. I know there are tons of portable CHARGERS out there for iphones and what not, but I am afriad these will attempt to "charge" my PI, therfore frying the board. Do they just supply power and the device recognizes power being recieved, so it displays charging? And I will be attachin a BUNCH of things via a usb hub to the Pi, so I doubt regular bunch of 4 rechargeable AAs will pwer my device for long with all thse extrra things drawing power. So my question is 3fold: can I buy one of those portable chargers to power my Pi or will it fry it? will 4 AAs be enough to power the Pi and all the extra usb things? and will it be more cost efficient to make a power supply? (I definetely want it be rechargeable, though). Any links to products, or guides to make one would be extremely helpful. Thanks in advance!!! Also, I already have a wall supply, but I need a power supply that is portable.

Question by Adum24   |  last reply


My favorites from the week of 2007-01-01

Constructing a 3D Settlers of Catan BoardThis is a beautiful project that surely makes playing the game a lot more enjoyable.Drawing MachineWhen robots create our art, can complete robot domination be far behind? More robot created art here at Robot/Art and Flying Fan.Budget photographic lighting "tent"Awesome! I've been planning to cut out the bottom of my light tent so I can place it on top of a full place setting to get better food pictures.Bawls Blue Crystal LED LightA great derivative project that builds on other Bawls Instructables.

Topic by ewilhelm 


Peltier Voltage control

I have a broken TEC wine cooler that I am converting into a temp controlled humidor. The MOSFET on the control board blew up so I was able to buy it for $9. I am adding humidity control and I want to log so I am going to control it with a raspberry pi. A Arduino would do but I want to program it in python and will have it host its own site to view data logging or to send failure alert.The wine cooler was rated at 70w, I'm not sure what the Peltier is rated but I am assuming less then that @ 12v. I did some tests with a bench PSU to see what it will draw at various voltages up to 8v (the max my psu goes)

Topic by BintuGomes   |  last reply


Peltier Voltage control

I have a broken TEC wine cooler that I am converting into a temp controlled humidor. The MOSFET on the control board blew up so I was able to buy it for $9. I am adding humidity control and I want to log so I am going to control it with a raspberry pi. A Arduino would do but I want to program it in python and will have it host its own site to view data logging or to send failure alert.The wine cooler was rated at 70w, I'm not sure what the Peltier is rated but I am assuming less then that @ 12v. I did some tests with a bench PSU to see what it will draw at various voltages up to 8v (the max my psu goes):

Topic by TobinTelder   |  last reply


Schematic for voltage drop (From 12VDC to 6VDC )

Hi all ^^ I am fixing a cassette deck ,but i am facing a problem. The original motor runs on 12 Volts DC ,but it is dead . I bought a new motor from the same company and with the same specifications (2400RPM). The problem is that it runs on 6Volts and not on 12Volts,  as the original is . Since the deck is old ,this is as close as i can get to finding a motor . The motor itself has a circuit within it ,that keeps the voltage and the RPM constant . So even if the voltage drops, this does not affect performance . If i use 12Volts ,I might destroy the circuit . If i use resistors to lower the voltage only ,then it does not have enough electrical current . Those motors need to draw freely electrical current ,since they draw more current when they are stressed ,so that they can keep spinning constantly at the same speed .This is why i need a schematic to lower the voltage ,but i don't know where to find one . The 12VDC comes from the main board of the cassette deck . I have a service manual that i can publish if needed . Thanks and best regards ,

Question by soundsmyth   |  last reply


Power bypass circuit?

Hey everybody, Ok so here's the deal...I'm building some external speakers for my zune. I'm using some the board out of some old computer speakers to amplify the sound. Right now, since I'd like to make it portable, I've got it hooked up to a 12v regulator going to two 9v batteries. Since it seems to drain the batteries of charge pretty quickly, I'd really like a better way to keep them powered when I'm near a wall outlet (like when I'm at home). I managed to find an old 12v wall adapter that I could use as a constant source of power. Correct me if I'm wrong but I'm pretty sure that I can't have it and the batteries hooked up at the same time. So what I'd like to know is how do you build a bypass circuit (or whatever it's called) so that, when the wall adapter is plugged in, the board will draw power from it instead of the batteries? Sorry for the long read, and happy building everyone.

Topic by Triblade101   |  last reply


how do I connect 2 stepper motors for a single Axis using two different drivers (slaved drives so I dont lose current)?

Hello,    I am currently building a cnc machine and realized that if I use two NEMA 23 to operate the Y-Axis from one controller, each would get half the current, I don't really have an understanding of electrical components but I keep reading forums suggesting I slav two drivers together using one signal input, I found the wiring diagram for the cnc I'm building and was wondering if someone could explain it to me or draw a diagram.    My understanding is I can use another driver that is powered separately but I run the signal wires for both motors from the same source, would this work or would this cause hardware issues or destroy the board. I would really appreciate any and all help. I've included the image from the build I found, I was hoping someone could draw ontop of this or explain it to me in a diagram.

Question by notnowmyheadhurts   |  last reply


MEng Project: Vision-Led SLAM

Hi, I know Ive missed this competition but I am about to start a big project and wanted to share my ideas with some like-minded individuals who may have some suggestions. I am about to embark on a 4th year university project involving doing something clever with an iRobot Create. I am looking towards approaching the problem of location recognition in mobile robots by attaching a command module and a webcam to the robot and using computer vision (CV) methods to identify landmarks. I thought an interesting goal would be to get the robot to map a floor of my department building. After that it might attempt to classify distinct rooms. There is a white board on the wall of a corridor that the robot could potentially locate and possibly draw on with the use of a robotic arm. The ultimate goal of this project could then be to get the robot to draw a map of the floor on the white board (perhaps a bit excessive). I am aware this project would involve implementing SLAM, integrating the map data with feature information from CV-processed real-time images and developing some kind of recognition determination model (i.e. neural networks or something). After that I clueless. I have never even looked at a robot before, but Im really excited about finally having a go. I would really appreciate it if anyone has any thoughts or relevant experiences or warnings :) then please let me know! Also, any other ideas for what I could do with the iRobot, a camera and 6 months ;) Cheers, Tom PS Ive never seen this site before and it is awesome! I want to read everything :D

Topic by hungrytom   |  last reply


Hall sensor question

Hey all.I want to be able to measure the current draw through an AC wire in a confined space. I'm thinking hall sensors would be ideal for this due to small size and less chance of frying things (as opposed to a split-core transformer).Unfortunately all of the hall current sensor projects I've found here on instructables are for the pre-made ACS712 board. This is a no-go for me because of size, the need for cutting the wire to make the connection, and also cost is a factor too.Are there other options? I see a lot of three-wire sensors in through-hole transistor packages out there which would be ideal, but can you get the sensor voltage out of any of these, or is it strictly on/off?Any hints welcome.

Question by PS118   |  last reply


CD stepper motor controlled by PC?

Hello, Is it possible to control a bi-polar stepper motor from a CD reader/writer with the original print board? (so without adding any other IC's), and also with the original flat-cable? I would like to create an XY positioning table with 2 of these stepper motors. I don't understand much about data transfer trough a serial port, so I would like to keep using the original wiring (flat cable) that goes to the motherboard of my PC. Does there also exist software to program a pattern (for drawing an image on the XY table) that sends signals directly to the stepper motor? (trough the flat-cable) ? Thanks in advance, Electorials

Question by DELETED_Electorials 


solar battery amp hours and panel which one ?

Hello, I am working on a project that is solar powered. I am not sure what kind of solar battery i should get and equivalent  solar panel to charge it.. and regulator --- The parameters are: The 'show' will take place every hour for eight hours during daylight hours.. Each hour every 10 mins the system will switch ON and power will be needed to operate 25 automatic car antennas that draw about 0.8amps for about 1 minute show time. So every hour I will be drawing 25*0.8*6 = 120  ? -- I am new to this so i figure my calculations are wrong as 120amps seems a lot -- the system will also be powering an Arduino board which will be controlling the overall timing and puppetering of the work ie some coil relays or transistors for lower power consumption. this project will be installed in Germany in the summer with average sunlight conditions .. From my reading up on the subject I understand that it is not good to drain a battery, ideally half drain is max...could someone please advise what values i need for battery and solar panel.. thanks in advance .. Cc

Topic by carloc   |  last reply


Equation for accurate bending (kerfing) of plywood

I am planning out my first Instructable. It will be a bent (kerfed) plywood coffee table, There have been a growing number of projects out in the 'makeosphere,' where people are cutting slits or kerfs that go almost completely through a thicker piece of wood, allowing it to be easily bent. I am on a super-tight budget, and cannot afford to ruin my $22 sheet of plywood, so I was hoping that someone might be able to help me with some measurements for cutting the kerf-slits in the plywood. Here is the idea all sketched out. I need help with the measurements that are in bold.  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *  PROJECT DESCRIPTION:  Materials: 1x | 4 ft. x 2 ft. 3/4 in birch plywood 2x | 3 ft. 5/8 in threaded metal rods 8x | flat washers 4x | standard nuts 4x | "end nuts"  Steps: On the sheet of plywood, measure in X inches and mark X number of cross cut lines, X inches apart. Measure in 2 inches from each end of the board and draw a line. Measure in 2 inches each each side of the board, and draw another line. Drill out a 5/8 inch hold at all 4 of these crossed lines. Thread a standard nut onto each end of the threaded rod and screw it on 1-2 inches roughly, then slip a flat washer over the threaded rod. Bend each end of the board up to create almost 90 degree angles. Insert each end of the threaded rod into the holes, slip a flat washer over the threaded rod and screw on each of the four "end nuts."  Use the standard nuts, and the end nuts to fine tune the bends into 90 degree angles.  Flip the table over, and enjoy.  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *  Stability is more important to me than curve radius. I don't know if spacing cuts close together for a small curve radius is more or less stable than placing the cuts further apart for a larger radius. I've never done this, but I have seen that there is an equation for this. I haven't been able to find the equation actually expressed, I've just heard that there is one. Does anyone know about this area of woodworking/physics?

Topic by Dolmetscher007   |  last reply


A way to step up 30uV-300uV to 1mV+?

So I'm working at a TV repair shop but really we fix and work on almost anything electronic. In this situation we have a NEUROSIGN 100 which is used to tell the surgeon when he's near the nerve, but he needs the voltage spike to be recorded on paper when he touches the nerve. The problem is that the machine only gives out around 30uV-300uV as he is working and the electronic ghraph we have only startes recording at 1mV. We need a way to step up that voltage coming out the machine so that ghraph will record it. We tried a small audio amplifier but that didn't work at all so we're back to the drawing board.

Question by Jimmy Proton   |  last reply


Mobile Solar LED marquee

I've got a feasibility question for the forum. I'm interested in prototyping an outdoor solar-powered LED marquee-display drawing messages from a modem/SIM card (and therefore updatable via SMS). The modem piece of this is certainly possible, I think I could whip this together with an arduino board if necessary.  The solar piece is questionable, given the voltage requirements of even a small LED display + modem + controller. Would love to hear people's thoughts on where to start with this.  I'm considering using the LED marquee instructable, or even creating the dot-matrix myself.  There are also hundreds of display manufacturers, so it seems like tinkering with a 12V display might be the fastest solution.  In terms of solar powered displays, however, I've found only one company doing this, and the costs are enormous.   Thanks for reading. Jack

Topic by jg7zp   |  last reply


Hi, Can anyone tell me how to wire up a simple AMP meter (220 volt) so that I can test the AMP's? of an appliance?

I have built a little power board which consists of a double plug adapter which plugs into a mains supply in the house, I then want to be able to plug in an appliance, say a fridge and see how many amps it draws - I want to be able to make this all fit into a briefcase so that it is portable - I can do all of that but just need to know how to put an AMP meter in between the power supply and the double plug where I will plug the appliance in. I realize I could do this with a clamp meter (which I have) but I have a specific reason to do this without a clamp meter

Question by enerwise   |  last reply