Search for width in Topics

Need help with pulse width modulation for motor for aiming laser pointer

I'm trying to build a model with a small remote control laser pointer aiming system. I'm not exactly a mechanical genius and, I don't want to spend over $100, or much over $30 if I can help it. I figured I could set up a simple pulley system with some cord running from the laser pointer to two small electric motors, one for right and left and another for up and down. I don't need the laser pointer to swivel 360 degrees, just about 90 vertically and horizontally would work fine. If I were to attach a few monetary switches, I would be able to run the motors one way or the other, and get the laser pointer to point wherever I want. The main problem I am having is that every electric motor I find has a RPM in the thousands. Such speed would jolt the laser to one side or the other without any means of fine adjustments in aiming. I've looked around and it seems to be the general idea that either a PWM (pulse width modulation) controller or gear box are the best options to get lower RPM out of a motor. I don't have much room to work with where I want to mount the laser pointer, so I decided to go with a PWM controller and spread the components around the model to save space. I've been doing my best to construct this.... ... but my knowledge of circuitry is rather limited, having only take a college course on basic circuitry, I'm in a little over my head. Could someone please identify the component labeled "PULSE WIDTH ADJ" (center bottom, between the two diodes) is it two 250K resistors in series with the lead to the left acting as a resistive load or something else? Also, what is the component labeled "IRFD024" (far right below the motor) I would be very appreciative for any information that would aid me in getting a PWM controller to slow a motor down to around 50 RPM. If some one has a better idea all together, I would be willing to scrap the motors for another project and start from scratch.

Topic by cruton    |  last reply

PCB traces? Answered

so if i have a high current device (inductor) on a pcb? it will run somewhere around 2 amps of power. Is there a minimum trace width to keep my pcb trace from being blown up?

Question by astroboy907    |  last reply

PCB Trace Width Questions

Hello instructioners, So i am working on a PCB to use my XBOX 360 power supply as a standard 12volt 16 amp without hacking it apart. I've taken the female plug from a dead Xbox and I've recreated the layout in ExpressPCB. my only issue is being that its 16 amps @ 12volts is the trace widths to hold that much power are ridiculously wide we are talking 7mm or there abouts. I used several different online calculators to determine trace width.  My question is..  how small can i get away with for traces and still get 16amps.. is there a way of bridging the front and back side of a 2side PCB to allow for more amperage on smaller traces? i am really at a loss here. since my PCB is set at 38mm by 38mm and the connector size is 27mm long by 23mm wide. with 7mm wide traces i can't connect all the power pins together and all the ground pins together and route them out. Now i realize the 16amps is max draw but i'd like to plan for a max draw situation that way i feel confident enough to not have to check it all the time to make sure its not melting. Below is an image of the current board in Express PCB the labeled Thru-hole are connections i will need to make for this all to work. the other remaining holes are for mounting the female jack securely. The three yellow boxed connections are 12v+ The three greyed boxed connections are gnd ENG is bridged to +5 to make the XBOX PSU provide 12v

Topic by jgosselin    |  last reply

how do I control brightness of RGB Led using PWM module

Hi,  I'm new to using Programming integrated circuit (PIC), I just acquired a PICKIT 3 made up of PIC18F45K20 Microcontroller. I'm need help understanding how to control brightness/ dimness of a RGB  led using PWM. The problem here is most tutorial I've come across only explain how to do this using one or more of the same type of led (same color). I need a tutorial explaining how to control brightness of red green and blue and whatever dimness state (say 20%) is, it remains in the same brightness when i pick a different color. if someone can direct me to a tutorial on how to configure RGB (not just LEDs) and using PWM. that would be much appreciated.

Topic by nigho4real    |  last reply

What are the dimensions of pallet wood? Answered

Yes, I've searched. Also, I don't mean what are the dimensions of the pallets in general, I mean the wooden planks they're made of. PS: I realize it may vary. Estimates are OK. I'm mainly worried about thickness. Thanks for any help.

Question by travw    |  last reply

What is the size for an avatar picture without if leaving any left over space?

I looking for a new avatar, and I want to know the length and width without leaving a white border.

Question by Rock Soldier    |  last reply

Could anyone help me with creating a PWM controller? Answered

Hello, I would like to create a PWM controller that has three pot's: - Duty-cycle pot - A pot for adjusting the frequency - a pot for adjusting the output voltage. I'd also like to create this one just with transistors (so no timer IC's). I have some MOSFET's that I can use for switching on and off the load. The PWM controller should output an AC voltage, but if that is too hard to make, an alternating DC voltage is also good. The frequency range should go from 30-50Hz up to 4-6kHz. (I don't really know if this is going to be possible to adjust with just one POT, but I can also use a Trim pot for this). You don't need to explain every little detail. I have basic electronics knowledge. I just don't know where to start. This is what I have until now. It's not working very well because when I change the duty-cycle the frequency also changes. The frequency POT is also not good because the frequency decreases when I go to higher resistance, and when I'm going to the highest resistance, the frequency increases again :(

Question by DELETED_Electorials    |  last reply

inset feed depth and width in microstrip patch antenna?

I am making an microstrip patch antenna for satellite navigation in L1, L5 and S band. Initially i have started with the design of inset feed microstrip patch antenna for L1 band and i have a problem in finding the width and depth of inset feed of microstrip line.

Question by jerry.sra    |  last reply

TypeError: Cannot read property 'src' of undefined: {src:Vars.richSnippet.thumbnail.src, width:75, height: 75}

TypeError: Cannot read property 'src' of undefined: {src:Vars.richSnippet.thumbnail.src, width:75, height: 75} I always get this on any question on a search. I hope you guys can help!

Topic by GameNox    |  last reply

Using a hall effect sensor with TL494 pulse width modulator.

I have an electric billy cart with a dead controller board. I constructed the kit circuit below to replace the dead board and it works well enough for the job except for one small problem. The throttle on the billy cart utilizes a hall effect device and not a pot. The billy cart also has a handbrake with a switch that closes when applied. I use this with a resistor to discharge C2 and pull pin 4 (inhibit) high. This ensures a gentle start (as the capacitor slowly charges through the 100k resistor) if the brake is released with the throttle advanced. The output range of the throttle is 950 mV to 4.1 V if VREF (5V) is used as the supply. (I'm dropping it in in place of the pot.) 4.1 V is sufficient to achieve the maximum 90% duty cycle of the chip, but 950 mV leaves me with a minimum duty cycle of about 21%, and of course a motor that won't stop. Will changing the divider ratios 20k/2k2 & 47k/47k be sufficient to get me zero speed or am I going to have to do something more exotic? Thanks in advance.

Topic by Rasputin182    |  last reply

SSTC using microwave oven inverter?

I recently obtained a microwave oven inverter and I've been doing a lot of research trying to figure out how to power it. The microwave I found came with schematics and a decoder for the button membrane so I am able to operate the main control board and the MICOM board outside of the unit (with slight modifications) but I have yet to test the inverter in fear of blowing it up. Currently my question is can I build a 555 PWM to cheat the CPU or bypass it completely? if not then I suppose I could use the microwaves original circuitry to do so but I'd like to build a nice solid state tesla coil with it if possible.  Instructables is being retarded and wont let me add notes to my pictures  image one - Main control board to the left, MICOM control board in the middle, Iverter on the right image two - Slight modifications to power the board outside of the microwave image three - Used decoding chart to operate main circuit without button assembly image four and five - Showing the output of the MICOM board going to the CPU on the inverter and settings of Oscope (channel A)

Question by Jimmy Proton    |  last reply

Pulse width modulation dc motor speed control circuit please !!!!?

Hi friends, I need the circuit of pulse wave modulation speed control. - The motor is PMDC motor. - The input voltage is 12V -  The battery used is a 12V lead acid battery which delivers a current of 35A - Thus the power used would be around 400W (420W to be exact) Please give me the circuit stable enough to withstand this high current.... Note: I also found this circuit. " " can this circiut withstand my requirements... Thank u ......

Question by arjun169    |  last reply

Can pulse width modulation pins on arduino noticeably affect the strength of an electromagnet? Answered

I am currently designing a project in which two electromagnets cause a small metal object to levitate between them, and am trying to create an interactive interface in which gestures on a multi-touch trackpad cause the object to levitate higher or lower. My question is, is it possible to use an arduino's pulse width modulation to significantly alter the strength of an electromagnet in order to move an object at a noticeably varying distance from the electromagnet?

Question by ALogan97    |  last reply

what can 1/4 inch width plexi glass stand up to?

I want to build a battle bot out of of 1/4 inch plexi glass and i want to know if i will stand up to other robots and a lot of bumping around. Also, i need to drill into it, will it crack? thank you in advance.

Question by DaNerd11    |  last reply

carbon fiber felt ! ! ! --- looking for remnant lenght/width(s) of carbon fiber felt ,

Seaking to use carbon fiber felt to blanket/insulate against process heat loss to enviroment. can work with single pieces as small as 3 inches by 12 inches, aprox. thickness 3/8ths inch --HOPEING FOR cheap!

Question by big al 1048  

Become Record Holder

Present record of the smallest printing HOLY QURAN width 11mm height 8.5 mm length 14mm PRINTING AREA width 6mm lenth 11.5 mm height 8.5mm if u r interested contact at 03008127807

Topic by silverflame3344  

Infrared Variable Output? Answered

I am trying to wire some infrared LEDs to an Arduino. Problem is, the signal from the infrared LEDs has to be able to change variably, like from a potentiometer. What I mean is, I am aware you can read an ouput from an IR LED, then use the Arduino to replicate this and consequently control things, but what if I wanted to ouput a signal that changed, like a potentiometer? Basically, I would like to be able to control some motors speed through PWM by a potentiometer, but wirelessly. I'm not sure if this is possible, and if it is, is there some information I could look into? Any help is greatly appreciated.

Question by Adum24    |  last reply


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Topic by bdcoco  

Have music control a device with sine wave and frequency? Answered

Whilst I was using  a TENS unit (electric muscle stimulator) and was messing with the frequency and pulse width controls, I thought to myself, "What if I would redesign this device, so that I could plug it into my mp3 player and it control the frequency and pulse width so I could literally feel the music?" After long though, and looking to see if such a device existed (None that I could find.) I came up with nothing. Now my question is, how could I design such a device that would take in standard audio, and give a pulse width and frequency output? I would assume I would use a pulse width modulator (PWM) for the first part, but what about the frequency? And how would I make this as one unit? I am a complete novice at sine waves, frequency, audio, and things in that area, and I find the best way to learn is do a project involving it. So would anyone have an idea how such a device could be designed? Link, circuit diagrams, and tips are all gladly excepted.

Question by RocketPenguin    |  last reply

steps in photographic t-shirt printing?

Steps and guide in phptographic t-shirt printing[[Video(, {width:425, height:350})]]

Question by RASHDE    |  last reply

What component should I use to modulate an heating pad ? Answered

Rheostat, variable resistor, potentiometer, pulse width modulator, or dimmer, to my understanding I can use any of them to control the heat in my heating wire. I have a 19V 3.16A ouput and my heating wires resistance is 6.6 Ω (1.27 Ω/m). Thanks in advance for your reply.

Question by ninazz    |  last reply

My Son is building Pinewood derby cars and he wants to set one up to run flashing L.E.Ds. Answered

2 head lights 2 tail lights and 2 red and blue over head lights. This is to resemble police car and it has to stay in the size of the car and weight Width: - 2-3/4" Length - 7" Width between wheels - 1-3/4" Weight - Not over 5 Ounces THANKS any help would be great !!!!?

Question by Brian09    |  last reply

Right Transistor for a apx. 50watt H-bridge? Answered

Currently i am trying to make an Arduino UNO R3 control a 50 Watt (12 volts @ 4 amps) motor with an H bridge and use the Pulse width modulation on the Arduino to control the transistors. However i don't know what would be the best choice for transistors? Also I am new to this so can some also explain how transistors are named?

Question by luig    |  last reply

Can someone build a handheld label applicator (specifically for barcodes) and post a "How To" instructable.

There are only a few companies that make handheld label applicators and they seem to be of similar design and quite expensive. I'd like to know if there is a creative individual out there capable of making a simple DIY version that the "average" person could build on their own. This applicator would be used for applying labels, such as barcodes, to products. Labels typically come in large rolls that vary in width from 1 -  4" in width.  Thank You

Question by scheetham321    |  last reply

need a custom built sofa for 2 people?

Space is limited so max Ht 85cm, Depth 85 cm Width 170cm.  Needs to be of simple construction!

Question by randfmoore    |  last reply

Changing DC Circuit to Pulsed DC

I am interested in changing my fixed current DC circuit to pulsed to increase the brightness of my LEDs. I really have no direction when it comes to making this pulsed circuit. I have looked into precision full wave rectifiers that I think are what I would be looking for. I am not sure what type of pulse width I would want. The one that I think would be ideal would be a Mouser DF01M, I am not sure if a pulse width of 200 microseconds is fast enough.

Topic by JimmyWatson30    |  last reply

Changing DC Circuit to Pulsed DC

I am interested in changing my fixed current DC circuit to pulsed to increase the brightness of my LEDs. I really have no direction when it comes to making this pulsed circuit. I have looked into precision full wave rectifiers that I think are what I would be looking for. I am not sure what type of pulse width I would want. The one that I think would be ideal would be a Mouser DF01M, I am not sure if a pulse width of 200 microseconds is fast enough.

Topic by MarcusJubin    |  last reply

Can you dim a lamp with an arduino module and a solid state relay?

I bought a Crydom D2425 Solid State Relay 240 Vac 25 Amp relay and I've been able to use it in tandum with my arduino uno to turn on and off a desk lamp so far. I've been reading up on pulse width modulation and was wondering if it was possible to control the lamps light level (something more than just on and off) with it. All help is greatly appreciated.

Question by fdsafdsaqwrewqrbsafdsagrgew    |  last reply

how to make a bathroom cupboard under the washbasin?

Measurements are as follows height 31inches width 34inches depth 17 inches. instructions on how to cut the top peice of wood to fit around the basin would be most helpful

Question    |  last reply

Paint problem (winxp) Case image too big!!

Err..... art,tech or games, which one, oh its to do with art, lets go with art.At the time of writing, i could literaly destory paint (WinXP Prog), i spent 5 hours on making a custom wii case (well, paper selotaped onto wii), carefully measuring and converting values, and then it has the descensy to go and make the image bigger than it acctully need to be?!!! i spent ages just converting the damn CM measurements to pixels. please, someone shed light on to what happend.If you want to know what the pics and measurements are, there here!Measurements (CM)Wii Right Side:H:15.6w:21.7Backside ([==]<) H:13.9Backside W:19.6Backside Corner:2.5wii Left Side W:20.7H:Same as RSBack Side (>[==]) W:19Backside H: Same as RSCorner: Same as RSWii FacePlate:W:4.45 (From Side to Side)W:3.6 (From Corner edge (\|) to side)H:15.7Power Btn:Height:0.5Width:1.5X1:1.5 X2:2Y1:0.6 y2:2Reset Btn:Height: 0.4Width: 1.5X1:2.9 X2:3.4y1:0.6 y2:2SD CoverHeight:6.2Width:1.5x1:4.8 x2:11y1:0.6 y2:2Eject Btn:Height: 0.5Width: 1.5x1:13.7 x2:14.3y1:0.6 y2:2Disc Slot:Height:13.1width:0.9x1:1.3 x2:14.4y1:2.9 y2:3.8x:1.1 Disc-S to bottomimages % Design:

Topic by ultimatesx9    |  last reply

Stator back iron and Slot dept determination? Answered

Hi All! I am working on Permanent Magnet Synchronous Motor design. I need assistance on how to determine analytically or by any means possible stator back iron and slot dept dimensions other than using machine design software or application. Also, the Rotor Core size or diameter so as to know the spindle diameter. In the course of my research, I had uncovered how to calculate slot width, tooth width, pole arc etc but am yet to solve above problem. Anyone with the solution please help! Thanks in anticipation.

Question by Ugoem    |  last reply

Rotating a simple DC motor really slowly (1 rotation per 2 hours)?

This is to rotate a bike chain on a small cog. After doing some research, I came across a component called a Pulse Width Modulator. Would this be suitable for turning a simple DC motor at 1 rotation per 12 hours(EDIT: I meant 1 rotation per 2 hours, not 1 every 12 hours)? Or, would it only get me to a certain point before I need to use gear ratios to achieve my ideal revs? This really is a budget project so nothing too fancy.  Thanks

Question by Nenagh    |  last reply

what will be the wire size ?if i would like to make a eletro magnet ?which length could be 1200 mm and core width 40mm?

Dear friends, I want to make a drum with magnetic bars, to capture max matal particals from amixture, size of magnet should be 1200mm*---- ,suggest me what would be the Diameter of wire Regards Nadeem

Question by nadeem Ashraf    |  last reply

Can anyone direct me to a site or simplify the steps in making a micro tracking device?

Its a big ask but i need help on making a very small tracking device. This is just an idea atm but something the width of a pencil, or even smaller than that ?

Question by AllaW1    |  last reply

What are the dimensions of the Altoid Gum tin?

I'm looking for the Length x Width x Height in inches. They have been discontinued and I'm trying to order up blank, empty tins from a supplier for an electronics workshop. I've been scouring the interwebs, but no luck...

Question by agmilmoe    |  last reply

What is the max volume and size (assuming max width of 34&quot; and height of 14&quot;) cube you can make with a 4' by 8' board? Answered

I'm trying to design a sobwoofer box. I have a single sheet of plywood (and some smaller wood for a skeletal structure) and want to utilize as much of the wood as I can. By my estimate a single sheet cannot create enough volume for my speakers (believed to need 0.6 cu/ft to 1.25 cu/ft according to Alpine but online sub box calculators say it should be 7.9 cu/ft.

Question by AndaleTheGreat    |  last reply

Can someone debug this

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Question by wbur71138    |  last reply

VBA Code Needed for a certain formula in Excel?

I have an excel sheet, and I am trying to bring some sort of automation in to that sheet (since I use it quite often) with the help of macros. The fact is that I am really new to macros and VBA programming language, so I need a little help in writing the code to find the 10th percentile (the formula for it is PERCENTILE(array, 0.1) for each bin value (50, 100, 150). If you see the picture attached, the wanted percentile values are in Q, the bins for which I want to find the 10th percentile value, are given in Column M (50,100,150) and the main data on which the 10 percentile value will be based is given in Column D. By Using the data given in D and filtering out a certain bin width in column E (Example: Filtering bin width 50 or 100), we could find the Percentile value against each of the bin value given in Column N. As said earlier I am new to VBA code, so any help will be appreciated in order to find the percentile values for each bin. the link to the original spread sheet is given below:

Question by raishikoh    |  last reply

LDR and/or PWM for energy efficient 'smart' dimmer?

Is there any way to combine a Light Dependent Resistor or other light sensor with a Pulse width modulator to (energy efficiently) dim indoor lighting in the presence of sufficient natural light?  Thanks!

Question by bbawco2    |  last reply

How much big in length and size blades and what rpm of motor do I need to lift 600 kg of weight like helicopter?

How determine what size blades ( length , width ) and what rpm do the helicopter need to lift a specific weight like 600

Question by MuhammadK19    |  last reply

Can you take the arduino chip out of the arduino?

I have a pulse width modulation circuit set up on my arduino. Is there a way to take the chip out and connect it to leds? Can anyone explain this simple concept to me? I need to have a TINY PWM circuit

Question by SpiffyChee    |  last reply

I vaguely remember there is a way to dimension a drawing? Answered

Say you have a drawing or picture of a chest of drawers. It tells you the height, width, depth. There's a way to get the drawer dimension and such other needed measurements. I just cant recall how this was done, ie, a drafting ruler?

Question by BluTiger    |  last reply

How would I grow a giant crystal formation?

I have a 3 foot height by 1.5 foot width rectangular container of which i intend to grow a crystal formation in.  Does any one know how? That wont be toxic and wont dissolve?

Question by puregoldner    |  last reply

what voltage motor is needed to drive a 30x30cm chair

Actually i'm making a wooden chair of 30 cm height 30 cm width and 30 cm long and attaching wheels to the legs of the chair.I wanted to know the voltage of motor that should be used.For example whether 8volt motor or 9volt motor

Question by pvamsi    |  last reply

Projector length of tube? Answered

I was curious if it's possibly to extend a projected image, from a projector (like tv/computer) down about a foot of tube. Tube would be 1 - 2 inches wide. If this isn't possibly what would be the smallest width the tube would have to be for it able to go down a foot of length?

Question by ebodenberg    |  last reply

Can magnet attract iron over longer distances like 1 meter?

Can magnet attract over longer distances like 1 meter if yes then how much powerful means in width , length , type of magnet do i need to attract 2kg of iron ball over a distance of 1 meter ?

Question by MuhammadK19    |  last reply

VBA Code for finding the 10th percentile value for a certain bin Range?

Hello everyone I hope that you all are fine. I have an excel sheet, and I am trying to bring some sort of automation in to that sheet (since I use it quite often) with the help of macros. The fact is that I am really new to macros and VBA programming language, so I need a little help in writing the code to find the 10th percentile for each bin value (50, 100, 150). If you see the picture attached, the wanted percentile values are in Q, the bins for which I want to find the 10th percentile value, are given in Column M and the main data on which the 10 percentile value will be based is given in Column D. By Using the data given in D and filtering out a certain bin width in column E (Example: Filtering bin width 50 or 100), we could find the Percentile value against each of the bin value given in Column N. As said earlier I am new to VBA code, so any help will be appreciated in order to find the percentile values for each bin. I can give the excel sheet as well if someone want to try hand on it, and let's me know the email address. Additional Note: (The spread sheet is sorted out with respect to column E, is Ascending order (50, 100, 150) and the number of count for each bin width is given in column O, so you can just find the range of each bin by adding the count for each bin i.e range for first bin (50) is from 1 to 1+8542, similarly the range for the second bin (100) is given by 1+8542 to 1+8542+6862. I will be very grateful if someone spares some time for me. Kind Regards raishikoh

Question by raishikoh    |  last reply


Extensive knowledge on VRLA , AGM, MOTIVE POWER batteries. 1 to 24 cell batteries. 6,12,24,36,48 volts. Up to 2000 amp hr. The bonus here is I work with gentleman who has the worlds fastest street legal electric car. Videoinvalid movie: , {width:425, height:350}Videoinvalid movie:

Topic by ihovia    |  last reply