in seconds as worth a mhs?

I really wanted to know to use a 555 timer instead of a crystal oscillator 16 mhs

Question by ualbuquerque   |  last reply


3.6v 250mAh Ni-MH battery to run 10 5mm LEDs?

I would like to use a rechargeable 3.6v 250mAh Ni-MH battery to directly power 10 5mm LEDs, is that too much mAh?

Question by lifeofB   |  last reply


[help] How to make AA Ni-Mh charger? Answered

Hello! I have one DC Adapter (output 4.5v 500mA) , battery holder , some diod.... I wanna to make a charger which can charge 2AA Ni-Mh at same time.Please help me !!! Thank!! sorry for my bad English

Question by login721   |  last reply


Are these inductors?

If so, can anybody estimate their ratings? Or is there a way I can measure them? I'm looking for something around a 4mH inductor to use in "Simplest Ever DC-DC Boost 12v to 73v" instructable by "pyrohaz". Also, are these potential inductors the same as the ones found in CFL light bulbs? And one more thing, why does the small one have 4 wires coming out, the medium one has 2 wires, and the big one has 10?

Question by Ke-Bob   |  last reply


Arduino battery 9.6V 650mAh. Help?

I have alot of rc plane Ni-MH recharagables that I dont have a use for since my reciver blew up. Can I run my arduino deumonlative on these batterys they are 9.6V and 650mAh. Also I wold like to know how many mA can I draw from the arduinos 5V supply. Thanks for any help, David.

Question by David97   |  last reply


Why aren't Ni-mh batteries used for electric vehicles? Answered

It seems to me that Lead-acid and Lithium batteries are the only type of batteries used for electric vehicles. Also every one complains that Lead-acid is too heavy and Lithium is too expensive. So why not split the difference and use Ni-mh batteries? They aren't really heavy or expensive. Why aren't they used?

Question by bowmaster   |  last reply


Any ideas making rechargable ni-mh accu ,emergency usb charger for phones,pda etc.?

Any ideas making rechargable ni-mh accu ,emergency usb charger for phones,pda etc ?. it could be the same look like battery charger,thanks

Question by r2r   |  last reply




BATTERY help? Answered

i have a rechargeable battery that is 7.2 volts and 3000 mAh Ni-Mh now is it safe to add a Voltage Regulator to run an led or if not how do i? what also is scaring me is the 3000 mAh if its good or bad

Question by MACKattacksnipe   |  last reply


how to export videos to sony bloggie MHS-PM5K from computer?

I have .mov and .vob files,converted them to .mp4 (MPEG-4 movie) which is supported by sony bloggie, and put it in the sd card and try to start the video but it says "The operation cannot be executed on unsupported files." Please Help!

Question by manipushpak 


Can I use a 9.6V Ni-MH 650mAh battery with a arduino? Answered

Hi, I have a few batterys from a plane that don't really have a use for anymore. I have been trying to build a rc car but AA's don't supply enough current. I was wonderig if I could use these batterys directley with a duemilanove throug the onboard voltage regulator. They are 9.6V and 650mAh. Thanks for any help. Please leave a commnt. BTW I don't want to draw this much current from the arduino I just want to uer the arduino to cotrol a mosfet. Then run the motor off the battery directley.

Question by David97   |  last reply


AAA/AA batery charger? Answered

Hi guys i want to build batery charger for AAA/AA Ni-Mh bateries and im wondering is there any schematics that can help me?  Thaks a lot :)

Question by JohnSmith-Workshop   |  last reply


DIY Laptop Battery

 I bought a second-hand, cheap laptop but it doesn't have a battery. It's an HP Compaq Presario V6000 series. I don't want to spend on getting a new battery right now. Is there a way I can make a cheap laptop battery out of Ni-Mh cells that I already have? Or, if I get a cheap China made battery in the near future, is there a way to charge that Li-ion battery using the Ni-Mh cells, when it goes low and there's no electricity? Please advise if something like this exists or if someone already made it. Regards, RS 

Topic by rseni   |  last reply


Battery Charging?

Hello, So I have a 9.6 volt  NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

Topic by ben2000   |  last reply


Battery Charging? Answered

Hello, So I have a 9.6 volt  NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

Question by ben2000   |  last reply


charge battery

I have battery 1cell NI-MH AA 1.2 v 1500mAH   and i need to charge it by using smps and diode for detect peak voltage of battery   i prefer fast charge for maximum 2 hours for my project  how much voltage and current i need in output of smps ?

Question by omar kotrash    |  last reply


i need to simply run a dot matrix printer motor with a 5v battery?

I ve got a motor of printer with 5v rating and 50 mh  i need to simply run it using 5v dc battery can i do so. it has 5 wires of different colours, please tell me how to do so?

Question by    |  last reply


Help in buying Solar Charge Controller?

I want to buy this. What is the best battery and solar panel for the same. I want  to use 6V rechargeable lithium batteries. I am guessing 2 in series will be required. Can I use array of Ni-MH pencil batteries with solar chargers? I will be mostly using the setup for emergency power supply in all rooms (5). I may also use night lamps as trickle drain.

Question by artworker   |  last reply


Low voltage cutout

Hello, I need a simple circuit to switch off a high brightness LED that draws 200ma when my four cell Ni-MH battery pack drops to 4.0v(1.0v per cell) Nothing too complicated, something with a transistor, a comparator circuit, and a zener or an all in one IC? I've tried a few "this should work" circuits and then have been told, "well I haven't actually built one". Thanks.

Topic by jefflahay   |  last reply


How many volts and amps would i need to charge 10x 1.2v 1800mAh Ni-MH batteries at the same time?

So i have a battery pack of 10 rechargeable batteries (1.2v 1800mAh) and i was wondering how many amps and volts I need to charge them all at the same time. Instead of having to take out like 2 at a time to charge them. Is it possible to charge them all at the same time? Thanks for any answers!

Question by Alberto64   |  last reply


LED that light up if the battery is charged

I am making a solar charger for one Ni-Mh battery 3000ma. My solar cell is 2V 300ma. I want there to be an LED that will light up, if the battery is fully charged, I went through alot of articles online, and here is a circuit that I think might work, but I'm not sure, so if you could tell if this is going to work or not, it would be great, and any modifications I can do. I'm not sure about the value of the diode. 

Question by NiKiToS   |  last reply


solar circuit not working properly? any ideas?

I am building a solar powered charger for when I go on holiday, I know there are already some instructables on this but and can't seem to find anything to do with my problem. I use the solar panels to charge Ni-MH batteries  and when I test them in a simple circuit i.e. solar panels connected straight to the batteries, they charge but in my circuit below the battery connections on the casing heat up and the casing smokes. Obviously this is a problem but I don't know what is causing it. My schematic is below. Stu

Question by stuart576   |  last reply


how to measure inductance using a bridge?

My LCR meter can only read inductances of mH to a few Henries. I need to make a 470uH inductor, since in my place inductors are not so common. How can i measure inductances at microhenries if my LCR meter's reading capability only ranges from millihenries to henries? Someone told me to use bridges like wheatstone bridge or maxwell bridge to have an accurate reading, but i don't know how to do it. Can you suggest any reference? I prefer doing wheatstone. Thank you in advance :)

Question by codestroy7   |  last reply


Help with chardging batterys in paralell?

I have a Nikko Super Dictator witch I replaced all the eletronics in it apart of the engines. I used an rc reciver I found lying around out of a plane. I put this in the car (it olny has one engine now because one was blowen with the eletronics when I got it). The problem is that the batterys get hot and run out very fast. Each battery is 9.6 volt, 650MAh, Ni-MH, and the chardger is 9.6V, 300Ma (the batterys are equivlent to 8xaaa batterys in series). I want to wire two batterys in paralell and tape them together. How, and what, would I chardge these batterys I have made?

Question by David97   |  last reply


Can i create a electronic circuit to handle LED strips like this? Answered

I am trying to create another electronic board that handles LED strips.  I am a newbie, and this is my second build. I tested the circuit but my 10 ohms resistor burnt out. Any advice or suggestions for resistor for this circuit? If i use any resistor 100 ohms + (100, 150, 225, etc) seems to dim the brightness of the LED strips. Should i leave my schematic the same and just use a higher resistor e.g.. 68 ohms or 82 ohms? My LED strips are :- Working Input Voltage: 12VDC. Working Current/meter: 0.4A. Output power: 48W /5 Meter.

Question by islandboii242   |  last reply


Charging NiMh batteries using a small motor - Help!!

I want to build a battery charger that is capable of charging 12v (2x6v) of NI-Mh PCB type batteries (varta packs from farnell) . I think the batteries are button types bound together. The input will be from a small 1" diameter motor spun to give 12v out (I assume this is a dynamo). The output from the batteries needs to power : a 12v wireless reciever (6mA standby/66mA switching) a 12v - 24v dc/dc converter powering a solenoid at 25mA@24v. I have seen a 12v charge regulator in Maplins but it is designed for car batteries. If I send the 12v motor/dynamo output to the charge controller and then onto the batteries will they blow up? As I am a mechanical engineer this is new to me so can anyone help ?

Topic by bluegitty   |  last reply


Efficient LED lighting? Answered

I want to power 3x 0.5W LEDs in series with 3x AA Ni-Mh batteries (input voltage will range from 2.5 to- 3.7 ). The total forward voltage is around 10volts, and the current of the LEDs is 150mA. I've tried using a Joule thief but it's quite inefficient, even with different transistor / toroid / resistor configurations (even with fast switching Darlington transistors) the maximum current I've been able to get at the LEDs is less than 100mA, and many energy gets lost in the process, it seems the resistor between the coil and the base of the transistor slows down the switching process and limits the current. I need a more efficient way to power the LED's, either an improved design or a LED driver chip. But trying to keep the efficiency rate around 60-70% or more. I have found a design that claims to be more efficient (see picture), but I'm not sure about if it will deliver 150mA.

Question by Victor805   |  last reply


How can I make a compact 800 volt power supply?

I'm making (drum-roll please) a disposable camera coil gun. so far, we've gotten to the point where we have a fast enough output and enough kinetic joules to kill small game. the thing is, we should really make a more reliable power supply than the daisy-chained flash circuits we have right now. any ideas on a more compact supply that I could run off Ni-mh AA's or 9v's? is there a specific way to cannibalize a flash circuit to make it more compact? I'm good with heat-sinks. one idea i came across was to make a resonant transformer but i'm not sure how practical that is. Any ideas at all are welcome. this is the last step before we add another stage.  >G

Question by ltnemo2000   |  last reply


How do I make a truly versatile solar powered cell phone charger? Answered

I have many questions! I am trying to make a solar powered cell phone charger that has lots of versatility. When no phone is connected, it needs to charge 4, 2500 maH Ni-MH batteries. When a phone is present, it needs to charge from either the batteries or a 12 V, 1.5 W solar panel. I have found several voltage regulator circuits, but I don't understand how to calculate the proper capacitor values to stabalize the current using a PT5101 voltage regulator, or how to get 5V constantly if the voltage ranges from 2.4 V, from the AA's in series, or as high as my 12 V from my solar panel? I don't want to buy a circuit, or salvage one, but create it from individual components. Any help?.

Question by Phaedrush   |  last reply


Printing a Random Pattern on the desk

A couple of weeks ago, I bought an Ativa (Office Depot store brand) wireless mouse on sale for $15. It appears that they were clearing out stock, because they no longer list it on their website, but this is the closest thing I've found. I like the mouse, particularly because there is a built-in charger in the wireless tranciever for the two Ni-MH AAAs it takes. Yes, AAAs, the link is for a different mouse.Problem: Lousy resolution, I think. the wired Lenovomouse that came with my computer worked just fine on my smooth, blank desk surface, but this one requires much more of a pattern. I don't like mousepads. Scribbles with a pencil work well so far, but they smudge after a day or so. I want to put some sort of pattern on my desk for it to read. My best idea was a laser-cut random bitmap stencil and a can of black spray paint, but I don't have a laser cutter. Ideas?

Topic by CameronSS   |  last reply


Solar 3w led fibre optic outside tree decoration

So I have salvaged a solar panel and the battery that it charged from a wireless alarm. The battery is 6v 1.2amps. My plan is to have the panel charge the cell during the day (its Ni-Mh) and using an LDR light a 3w led when its dark. The led will be connected to a number of strands of 1.5mm fibre optic cord, with a number of these attached to a tree to make it look.....nice. I have tested three strands of fibre optic cord with lengths of 2m with a lesser led and all appeared fine. I have a 3.7v 700ma driver (coming from China) which will drive one 3w led, along with heat sink. Now is where I am struggling a little, I am not massively experienced in electronics. I think I want a diode attached to the solar panel to avoid battery drain. Then a resistor to reduce my 6v to 3.7-4v and the LDR. Does this look like it would work in principle? Would the battery run 2 of these drivers/leds or would it discharge too rapidly? Thanks for any input!

Topic by earton   |  last reply


What is the right way to connect the cells of this battery pack, and tips on making a power bank? Answered

Greeting makers, I have a few questions about connecting Battery cells, and making a DIY Power Bank. And I'd like to hear your opinion on it. I have 12x Ni-Mh 1.2v 3000mAh AA betteries laying around. They are brand new and I thought of using them to make a Power Bank. Since most phones use 5v for charging I wanted to connect 4 cells in series giving me 5v and 3 of these packs in parallel for an end result of a single 5v 9000mAh Battery Pack. But when I started to connect them I realized that there are 2 ways it can be done, and I am not sure which is the right one. Is there any difference at all?  I will add a picture below, as it says more than thousand words. Furthermore I would like to ask for your opinion on how to proceed making a functional power bank. Just wiring the cells straight to an Usb port doesn't seem like a smart idea.  What would I need to make sure it is safe for the devices it charges? And how could I make the Power Bank rechargeable via Usb? Thanks in advance.

Question by icemaciop   |  last reply


I need a circuit to run a tiny motor from a USB port? Answered

I made a leather "Steam Punk" case for a portable hard drive. It has several gears that show under a glass porthole and I need a way to move the gears powered from a second USB cable. I'll use a separate USB cable then the Hard drive as I don't want to compromise the original device. I have a very small motor from some Radio Shack ZipZap RC cars. Tried to design a simple circuit myself but can't get the motor to spin. I suspect it doesn't have enough current. The motor does spin if hooked directly to a AA batery. The ZipZaps work with 2 AAA bateries in the charger/controller. The car hooks on top of the controller charges up and then can run for a short time. Opening the car up it has a 1.2 V 100mAh NI-MH battery inside it. Tried looking at a couple of BEAM robot solar engine designs used to run small motors from solar cells but just coudn't figure out how to convert them. I'm looking for a small circuit (in size) that could drive this motor, with a backwards current spike protector so the USB or computer doesn't get fried. I have limited EE experience but can through hole solder but not surface mount. -Steve

Question by nevets_mcd   |  last reply


FEETECH 17DOF DIY humanoid robot

Https://www.instructables.com/edit/new Feetech 17 DOF humanoid robot ready to play for education DIY FEETECH New Humanoid Robot Profile https://www.youtube.com/watch?v=bSsR33E2Zr0 The FT-17DOF-SC-RTP is a ready to play humanoid robot which comes fully assembled & completed from our team at FEETECH. This humanoid robot uses 17PCS FT-SCServo (SCS15). SCS15 is all metal gear 15kg.cm and uses TTL level Half Duplex Asynchronous UART BUS Communication Protocol. It gives the feedback of the data relevant to position, voltage temperature, load and speed. This humanoid robot uses all aluminum alloy parts, anodized color (red, blue, white for optional) or an assortment.It is simple wiring and makes assembly and disassembly fast and convenient. It is easy to use "MOTION" editing software for Windows system. As long as you use a computer you will love playing with this humanoid robot, even if you do not have any programming knowledge, you can edit the humanoid robot actions within ‘MOTION’ editing software. Robot hobbyist can move the robot in a variety of different poses by hand, then read in and save data from robot joint SCServo via software, moving through the posture sequences from one by one will complete the program of series motion or dance. The data of dance or motion group can be saved into your local computer for use the next time, or download into the robot control board for offline operation. The 2.4G remote control system is based on Arduino open source, users can freely modify according to our Arduino source and combination with the Robot Control Board (SCM-1) to create more advanced functions. You will feel strong & excited when to play this robot dance and movement patterns. The Robot Control Board (SCM-1) can also accept UART instructions, allowing the user to send control instructions according to the packet data’s protocol complementing the robot scope of uses and research. Humanoid Robot Specifications Height:380mm; Weight: 1.7kg(Including battery); DOF:17 Degrees Of Freedom in total Head 1 PCS Hands 6 PCS Feet 10 PCS Connect with computer:USB-mini 2300mAH NI-MH rechargeable battery and AC charger Arduino open source 2.4 G remote control system Key feature -17DOF,UART BUS servo, simple wiring, easy to assemble and disassemble -It is easy to use "MOTION" editing software for Windows system, Programmed robot’s motion by hand. -Save the robot motion data on local and is easy to be use by other robots. -Motion automatic interpolations function; Make the movement more continuous and smooth, make sure the movement of posture to posture more perfect within specified speed time. -Can name the motion group by yourself if you need great for understanding and memory. It can repeat like function calls every motion group. Each motion can be imported and exported alone. -After a series of motion group orderly arrangement can coherent form a dance. Both played online and off-line available. -Each motion group can be remote controlled by Arduino open source 2.4G remote control system (especially good for use as a fighting robot) -With 39kb FLASH motion data storage unit, can be divided into 254 motion group. If storing one motion group, It can contain up to store 730 posture. -The “MOTION” software can show motion data. The robot will to move online when double-click any data of software. This is very easy to debug robot’s motion. -Can be controlled by Arduino UART with instructions. -NI-MH battery can recharge any time no needing worry about d damage. Battery can run about 30 minutes. -Accurate design of each part. Using a screwdriver can complete the assembly Packing list One assembly completed set of FT-17DOF-SC-RTP humanoid robot including: -All metal gear SCServo * 17pcs -Aluminum alloy machinery frame * 1set -Master control board (SCM-1) * 1pcs -Arduino open source 2.4 G remote control system * 1set -7.2V 3,000mAh NI-MH battery  * 1set -8.4 V AC charger * 1pcs -USB-mini cable 150cm -Programming software “Motion”  * 1set (download from Website) Related documents -Instruction manual -Robot debugging manual -Software debugging instruction -Remote controller instruction

Topic by Robotfans 


Powering Multiple Servos From One Battery- What is my circuit missing?

Hey Everyone, I'm working on a robotics project right now and my limited DIYer knowledge of electrical circuits is failing me. I need to power 7 Rage Standard Metal Gear Servos (RGRS104-16-6vm) and 4 RadioShack Micro Servos using a Tenergy 6V 3300mAh NiMH Battery Pack. I've made a diagram of the circuit I'd like to make, but I feel like there's more to this type of circuit than I've planned for. There are only 9 servo connections because two pairs of Rage Servos will be wired together to share the same battery and signal connection. I'm also open to using a different battery if that's what it takes to make the robot run smoothly (It has to use a rechargeable battery though; It's meant to be portable.) Would you please point out what I need to add to my circuit to make sure it works properly? Thanks in advance! More Info: Rage Standard Metal Gear Servo RGRS104-16-6vm Dimensions: 40.8 × 20.1 × 38 mm Weight: 56 g Operating Speed: 0.18sec/60degree (4.8V), 0.16sec/60degree (6V) Stall Torque: 9kg.cm/125.2oz.in(4.8V), 10.2kg.cm/141.9oz.in(6V) Operating Voltage: 4.8V~6V Control System: Analog Direction: CCW Operating Angle: 180degree Required Pulse: 500us-2500us Bearing Type: 2BB Gear Type: Metal Motor Type: Carbon Connector Wire Length: 30 cm. RadioShack Micro Servo Voltage: 4.8~6.0V Torque: 1.5kg/cm at 4.8V; 1.8kg/cm at 6.0V Speed: 0.12/60ТА at 4.8V; 0.10/60ТА at 6.0V Size: 23x11.5x24mm Weight: 8.6 g Use Angle: <=160ТА Tenergy 6V 3300mAh NiMH Battery Pack Chemistry: Ni-MH Cell Size: Sub-C Nominal Voltage (V): 6 Capacity (mAh): 3300 Max Continuous Discharge Current: 6A Battery Charging Current: Standard: 1A Weight: 10oz. Dimensions: 112 x 46 x 23mm (LxWxT) Connector: Hitech Link to Diagram: http://imgur.com/BRrWijV

Question by lukealbertson96   |  last reply


How To Turbo-Charge My LED Light String

I am new to electronics, but I have an idea and hope that it’s simple enough for some of you with more experience can tell me I’m either on the right track, or complete wasting my time. I have looked at a number of basic solar light / charger circuits in here and on the Web, and have a very basic grasp of how they work, but the intricacies and exceptions are still fuzzy to me.  I don’t want to recreate the circuits, and want minimal soldering since I’m new to that too. I have a 40 foot long string of 100 LED solar lights that are driven off of one hard-wired AA Ni-MH 1200mah battery.  There are three ideas I have to supercharge the string to improve it.  Without tracing through the existing circuit (which I may not understand anyway), I want to draw on your experience before I get too involved. If I ultimately need to pull things apart and try and trace the circuit, I will, but until then, your guidance would be appreciated. I would like to: A) Remove the old battery and add a larger capacity battery since I currently get maybe three hours of light.  Probably easily done. 1. Changing the battery to a larger capacity looks straightforward.  I will be adding a D cell (if it fits the case) NI-CD with 3000-5000mah (not purchased yet).  Since the cell is the same voltage, can I assume that the swap doesn’t really affect the circuit? B) Add another solar panel.  Probably easily done.  1. I have one small solar panel that came with the unit which feeds the existing battery.  I am assuming that it is 2v (to suit the AA battery) and based on the size, I am assuming that it is between 100 and 150ma peak output.  I would like to add another small panel that I have lying around that is rated 2V / 150ma.  Installing these in parallel should give me a higher energy input, but still at the 2v. Looking at the circuit board the solar panel goes to the board before the battery.  I am assuming that the only thing between the solar panels and the battery is the diode, and that there isn’t any sort of current / voltage limiter on the board.  Can I assume this? Is the diode likely to handle me doubling the power through it? 2. My calculated peak solar power for the two looks to be about 250 to 300ma.  By following the 10% rule for charging and assuming that I’ll likely not get 100% rated solar power for long,  I’m assuming that I my D-cell should handle the trickle charge? C) Increase the power through the white LED’s.  This is my main question, and biggest uncertainty. 1. I am assuming that driving 100 lights off of one battery does not really get close to the maximum.  I pulled the shrink tube off of one of the LED’s and it appears a simple parallel connection.   I don’t see any resistors that are inline with the LED bulbs or directly before or after the LED string wires on the board. I’m assuming that I can add a resistor in series with the light string. Will the light output change much? How can I figure out what resistance to add without blowing my LED’s? Am I on the right track? With my very rudimentary (and possibly wrong) multimeter skills, I tried to find the following as well: Battery voltage – 1.16 v Voltage (measured as parallel with the light string) – 2.56 v Current (measured in series with the light string) – 13.1ma (this sounds low?) I’m slowly learning my way through this, and I want to put together an ‘ible together when I’m done.  Any help, corrections to my assumptions or suggestions you have are appreciated. Sorry for the long-winded message. Craig

Topic by harley1974   |  last reply


What components do I need to produce my 3 rechargeable Power-Packs using what ive collected so far ? Please can anyone help ?

Hello & Good day to you all, I'm making my own powerpacks for: a miniature wireless CCTV camera & receiver (Link Below for specs) , and a rechargeable powerpack to charge my laptop (that dies in 15minutes!) Wireless Pinhole Spy Camera & receiver After spending stupid money on sh*t 9 volt batteries (600mAh = £11 EACH) - ive had enough of the crap and absolutely absurdly LOW capacity 9 volt batteries out there (when TODAY's 'D' cell is capable of 11,000mAh !!!) and extremely high cost - i am making a battery-pack to power my receiver and another power-pack for the wireless camera using Ni-MH rechargeable batteries in the following packs: Powerpack 1 (for camera) 6 x 18650 cells @ 3.6v each, 5000mAh {Total Power=21.6v} Output Power Needed:  8v, 200mA Powerpack 2 (for camera receiver) 24 x D Size cells @ 1.2v each 11000mAh ( Total Power= 28.8v)  Output Power Needed: 12v, 500mA  Powerpack 3 (for Laptop) 40 x D cells @ 1.2v each, 11000mAh {Total Power=48v} Output Power Needed: 16v, 4A  I should add that my existing 9-volt (2 new & 1 old) rechargeable batteries are a little-more-than USELESS (Rated @ 175mAh...{USELESS}) as the receiver of my wireless camera drinks the power (juice, lol) at an extremely FAST-Rate... 15 minutes of use and its DEAD. 10 mins of use from the old 9 volt battery. And thats all from a 9 hour charge... How pitiful...Despicable & Disgusting... Now i got the idea to use a semiconductor from an instructable to make a simple solder-fume-extractor... (Link Below!) and also i know that resistors can reduce the voltage and amperage output of a circuit.......... Solder Fume Extractor I have calculated, researched, 'Googled', calculated again, more googling and after 6 months of trawling through the internet to find parts of designs i could hack together to achieve my goals including getting answers from "SO-CALLED-EXPERTS 'In the trade'" and from Circuitry & Electronics Forums (whom shall not be named...) yet they always say, yeah, here's my email address, email me your questions and when i do, they all turn around and gimmi some crap like "oh...well...you have your plan all set-out so what do you need me for ?" AS*HOLES! F*C*ING AS*HOLES!!! - If these peeps didnt want to help in the 1st place, then WHY BOTHER to give me their email address so i could ask them directly for help ? Im now going to give up and finally cry-out --- Please HELP (Again and probably for the last time!) ok ok, enough of the hell's-anger-fuelled-rage-at-"EXPERTS" who give me the run-around.....(Bcoz they're AS*HOLES...) Please please please can anyone help me find the components i need to make my very simple circuits for my battery packs ! I know that the use of a/a few? semiconductor/s (3 pin only) can let in a certain voltage and only output a specific voltage & amperage - i think i'll be needing a combination of a semiconductor and a resistor but i've searched continuous for 6 months now and am now irritated-beyond-belief that i still haven't found what im looking for or that no one is willing to help! ffs! Many thanks in advance for some light on this darn-troubling matter.... Please Help !!! Power-Specification For My Gear: Wireless Receiver: DC 12V 500mA Wireless Camera: DC 8V 200mA Sony Vaio Laptop 16v, 4A Also how do i charge my individual power-packs ? At what volts & amps do i charge them ??? Im already severely mobility-impaired and wouldn't want my life getting worse by any of my battery-packs exploding near me!!!!  Ingredients i have collected So Far: - 12 x 18650 5000mAh Batteries (Li-ion) (i want to make a total of two power-packs with these) - Solder Tabs for battery Packs -Small to medium collection of semiconductors + (plus) & - (minus) output voltages (from -24v to +25v) and from 100mA to 1.5mA amperage... - Heatshrink (40mm, 50mm, 70mm) - 24 x D cells @ 11000mAh - 40 x D cells @ 11000mAh I have no resistors but can order anything i need online if i only knew what to order!!! i would also need to include a circuit to prevent deep-discharge & over-charge! This is where i need the main help: I cannot read electrical diagrams at all but try to but it takes a day of deciphering and thats only if i do it right, i have dyslexia and am fighting daily with it when it comes to referring to any diagrams concerning circuits so would it be possible if someone could draw the circuits i need onto an a4 piece of paper and photograph it to be posted here (or draw it in paint, lol) - what i mean is, to draw a basic 3 pin semiconductor (a square with the 3 pins coming out the bottom, lol) and then draw the wires that need to connect to all the 3 pins to then for the wires to go to whatever component they need to go to next, for example ? {the 'solder-fume-extractor's' wiring picture where you can clearly-see where all the wires connect to all the components is the only type of simple diagram i can read by myself} Still wiht me ? i lose myself sometimes! So as i understand it, from what ive been reading so far, as long as the voltage output of the battery pack is correct, say for example for my wireless camera, if ive used a semiconductor to get the voltage of my power-pack down to give an output of 8v rated to 500mAh, as the device (wireless camera) only uses a max of 200mAh, then does this mean that the device will only use what it needs and ignore the rest ? Also it has taken a week of help from many friends of mine to help write this question and to keep it on-track with my main goals for the 3 power-packs listed above! if anyone needs more info, please let me know and i shall endeavor to reply as soon as humanly possible, again many thanks for your help Again, many thanks in advance for all help given and i sincerely apologize the long speech of a few questions, im afraid i get too-specific when asking for help (and often branch-off far-too-much, like now, lol)

Topic by offtherails2010