Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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UV solder mask sticking to cover instead of PCB
I'm doing the usual DIY PCB process. Lately I got some of the chinese UV solder mask (similar to the one used in this video). I can work with it just fine - it sets under my UV lamp perfectly, within ...
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2
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Custom/DIY Metal-Core PCB?
I would like to fabricate a slight enhancement over the metal-core PCB's shown here:
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6071
Specifically, my application requires 2 LED's of ...
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1
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DIY 4*18650 Batteries charger with TP4056 paralel problem with how to balance it
days ago I did this project like the pic which is a DIY for 4*18650 OR 6*18650 (NOW I MADE 4 AND LET`S STICK TO IT) Sony vtc5a charger 3.7 v with new tp4056 with protection (copied from one youtube ...
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Game Show Button DIY help
The club I am a part of at my school is currently trying to host a variety/dating show in which contestants will have the capability of controlling a button. There should be about 12 buttons to make ...
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2
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1
answer
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Metal enclosure for custom car stereo project
I'm thinking about developing a custom car stereo, and it surprised me that there's no DIY enclosures for this purpose. I've just found plastic boxes in the 1 DIN size which can be installed into an ...
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0
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Common rectifier (or source) to power testing equipments
I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
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2
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147
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How do I properly calculate the requirements for an on/off switch?
I'm building an arc lighter to learn more about electronics and I'm not certain how to calculate what I need given the components I have. Do I go off the rating for the battery or the combination of ...
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1
answer
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Connecting a switch to a jack
Firstly i want to mention that I am not even close to an engineer or i have absolutely no experience with electronics. Here is my case. I have an old laptop with broken power button. It is not just ...
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1
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Building your own camera module [closed]
I would like to know how difficult it is to build your own camera module. For instance, how difficult would it be to assemble the Raspberry Pi camera module from scratch?
The reason I'm interested ...
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1
answer
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Are there any problems with my circuit design?
I am new to designing circuits but I have spent a lot of time researching for this project. I have been designing an automated indoor garden for my home. To save space, there will be 3 gardens stacked ...
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2
answers
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DIY flashlight - USB plug [closed]
I want to do something like the first of the gadgets in this video:
https://www.youtube.com/watch?v=aEo_nJ3iUYI (0:07 - 1:00)
It's a flashlight connected to the micro USB port in my cell phone, but ...
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1
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How to connect RJ45 (female) Link LED
I need a bit of help. I have some Jtron RJ45 sockets (do a quick search, for a better picture), and they have LEDs integrated.
I want to connect these sockets to a PCB and get the internet in (added ...
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0
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1
answer
7k
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How to wire a three phase bridge rectifier
I am doing a DIY three phase AC motor power generation project. I can understand the basics of electronics, and also understand how the wires are wired in a single phase rectifier. However, for three ...
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2
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2
answers
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Help with fixing LED night light that won't turn off
Software guy here, with limited practical electrical engineering skills (barely used a soldering iron since the university). :)
My daughter has a LED night light using inductive charging. After ...
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1
answer
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AUX input outputting +4v Causing reset of connected smartphone
I've added an AUX input to my Mercedes Audio 10 casette radio using an online tutorial. Essentially hooking up a 3.5mm jack direct to the output of the audio processor.
I'm familar with this ...
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2
votes
1
answer
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Device power requirements
I am designing a device and I'm confused on calculating my total amperage required.
I have designed this device to have 3 main circuits in parallel that all take 5 V from the same power source:
...
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2
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5
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444
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How to power up 50 LEDs? (DIY 'fireflies' project)
I want to install lots of tiny LEDs lights in my garden (at least 50).
I DON'T want high voltage cables in my garden so I am thinking in getting a high power, low voltage transformer to power up these ...
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2
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597
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Connecting 12V fan to LM317 DIY PSU circuit
I am working on a simple adjustable DIY power supply using an LM317 voltage regulator. J1 in the image below represents the transformer rated at 18VA, which rectified produces about 25V DC. The output ...
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0
answers
4k
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How to produce electricity with mechanical power/spring coil
As a home project I want to make a electricity generator which uses a spring coil, which when turned/wound(just like the mechanism in wrist watches) enough times will start unwinding and generate ...
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2
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2k
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Astable Multivibrator not oscilating
I am pretty new with this stuff, just learning. I wanted to make a simple PCB, and as this was my first project, I decided to go with astable multivibrator circuit, to oscillate 2 LED's using ...
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2
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1k
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Necessary parts to build a DIY smartwatch [closed]
I want to create a simple smartwatch that can receive text messages via Bluetooth/wifi from a computer. However I start doing research on necessary components and either get completely professional ...
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3
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597
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How could I make a 1kW fan heater consume less electricity? [closed]
My fan heater has only two settings, 1kW and 2kW.
But what if I wanted it to consume only 200W per hour ? Could I find a device to put in between to supply less electricity, how would I do that?
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3
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Regulations (if any) for using electronic devices built by myself in my house
Are there any rules and regulations for using electronic devices built by a user in his own house in the UK?
Like for example, if I build a DMX control system (from scratch - i.e. PCB and enclosures ...
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3
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Schematic for a lipo battery bleeder overcharge protector
OK, so I am building a 12v (really 11.1v) 10000mah lipo battery. I am going to use it on campouts to run things like 12v fans and car chargers and run other high-current devices that couldn't be run ...
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0
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2
answers
138
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LED circuit for 4 modules
I bought several LED's bulbs last years and several failed because crappy drivers.
I plan to combine 4 of these modules together and make a single custom DIY LED lamp.
Here is a photo of the modules ...
3
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6
answers
7k
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How can I build a simple USB signalling device?
I would like to construct a simple device that plugs into a USB port and sends the computer a signal (i.e just a 1) when a user presses the button or switch etc.
I ...
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1
answer
141
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Identify this electronic component from DVD drive [closed]
I got this component from an old laptop dvd drive. It was placed within the laser assembly. Could you tell me what this component may be?
3
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1
answer
6k
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What is the difference between 4-, 5- and 6-band resistors?
I have been buying PSU DIY kits from eBay and I am learning a lot the PSUs that I've soldered together use the LM317 and the resistors used in R1 and R2 can change the outgoing voltage. The LM317 PSU ...
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1
answer
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DIY car audio noise when the source device is charging from the same power source
I have a hobby in electrical engineering so I built my own car audio system given the fact that it didn't have any before. It's basically two pairs of PC speakers adapted with some resistors and ...
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1
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DIY ultrasonic sensor with LM358
I would like to make an ultrasonic sensor. For reciever part I have found this scheme: (source: www.kerrywong.com/2011/01/22/a-sensitive-diy-ultrasonic-range-sensor/)
Instead of LPC662 I would use ...
user74857
4
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2
answers
1k
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Most efficient way to power a 5 V circuit from a 14.8 V battery
I am making a DIY Raspberry Pi laptop. So far I have found a suitable board that will drive my display (M.NT68676.2A). From research I have found out that it will run off of anything from 12 V to ...
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3
answers
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Put outputs of 2 computer power supplies in series?
I've been working to figure out an LED lighting project for my classroom for a while now, readings on this site has helped. One part of the solution is to combine in series computer power supplies (...
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1
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Maximize efficiency and brightness of diff color, cheap, 5m 5630 SMD LED strip lighting
I'm a science teacher and we are going to explore different design/effects of grow-light setups this year in class. I've gotten some great ideas for this project from reading from this stackexchange ...
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3
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1
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How to find connections on board? - DIY Keyboard from Old Laptop
I have a project that I have hit a wall on. I need your guidance!
I need to find the spots on the board for the 4 USB connections.
The attached photo is of the board.
There are 4 connections I need ...
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1
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What type of processor will I need to control a mobile front camera? [closed]
I have a mobile front camera (like this one). I want to build a wearable camera out of it (like this one). However I want to make this from scratch and not have to resort to using a Raspberry Pi.
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3
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DIY Multi-Input Audio
Edited, see bottom of this post.
What would be the best method for preventing damage to multiple audio input devices that are connected to a home made audio patch panel?
Im wanting to make a device ...
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3
answers
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50W Amp for 15W Speaker
I am building a portable speaker and I am looking for a decent amp for my two 15W Phillips speakers. It is tough to find an amp that is efficient and cheap so I was wondering if there is something ...
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1
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Can I charge a 12V 2A NiCd battery with 18V 14.6A?
I have a 12V 2A NiCd battery which I want to charge. I have a power unit that puts out 18V 14.6A. Can I use it to charge it? Would the battery just draw the current it needs or would it always put ...
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1
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Combining Solar Panels Safely
I have a solar panels, with 5v with a 200ma output, I have it so this goes to a charge module which allows 3.7v lithium batteries to charge without exploding on me. If i hook another solar panel, same ...
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1
answer
4k
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DIY 2.4 ghz antenna for Bluetooth Speaker too cut or not to cut
I just built a Bluetooth speaker using a Sure Electronics AA-AB41136 Bluetooth 4.0 Audio Receiver Board. The reception was not great since it is a PCB antenna contained in my speaker box which is made ...
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0
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1
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745
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Will my car's AM/FM antenna boost the signal of a tablet/carputer GPS?
I'm installing an Android tablet as a carputer in my '97 Hunk-o'-Junk Crapwagon, and saw a reddit post detailing a carputer install where OP linked his Jaguar's antenna to a USB GPS adapter. OP also ...
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1
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DIY battery Pack Cell amperage difference
I have individually tested the capacity of ten 18650 batteries with my iCharger 4010. My question is, how much ampacity difference is ok when packing them in parallel ? The following are the readings ...
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1
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which power supply rating do I use for my diy led light panel?
I'm building a led light panel using 24 x 18W SMD 5630 72LED Rigid Light Strip Tube Bar Lamp Bright White 12V 1800LM connected in parallel so whats the power supply rating
Specifications for each ...
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1
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Fuse for a 18650 pack [closed]
Are there any fuses that i can use to protect a 18650 battery pack. I have a 2s8p which is rated at 12.6v 21.6A. one battery is rated at 4.2v at 2700mAh.
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1
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Simple and easy-to-charge battery for a DIY power generation project with varying voltages and currents?
I'm converting a decorative windmill to a power generation device. I'm looking for a battery that can charge with wildly different voltages and currents and be simple and easy to charge. It doesn't ...
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1
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597
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Can my DIY Arduino be powered with 12V battery via lm2576 switching regulator?
I have lm2576 switching regulator circuit with output constant 5v/3A. Can I use it with a 12V battery and connect it to power my Arduino?
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1
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573
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Inductive Charging Mouse [closed]
I recently bought a wireless gaming mouse and while functionally its great, the battery life is a little less than I would like.
I tried to mitigate this by adding in another rechargable AA battery (...
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2
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transformer windings
I have a 900 watts transformer from a microwave, this used to have a secondary voltage of around 2000 volts (for the magnetron) but I removed it. I wonder if by using 15 turn secondary that will give ...
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2
answers
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Is this an RC filter in the circuit for a nightlight?
So there is this nightlight (a little flower that you plug in directly into a mains socket and switching it on gives you some light to light up your bedroom at night) which I dismantled and tried to ...
- 382
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votes
1
answer
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Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?
I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy):
I have an earphone splitter for iphones that has ...
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