Questions tagged [diy]

Do It Yourself. Build, modify, repair something without the aid of trained professionals.

0
votes
1answer
937 views

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 ...
0
votes
1answer
3k views

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 ...
9
votes
3answers
32k views

Is there way to construct an 18650 battery pack with built-in balance charging? Or is balancing not very necessary?

This is my first post here. Err, I'm a DIY enthusiast especially in electronics. I'm actually building a portable Playstation 2 Slim with an IPS display, so that it would look like a Wii U controller....
2
votes
2answers
989 views

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 ...
0
votes
0answers
422 views

DIY power supply 4 amps and 5 Volts

How can I make a power supply that is able to give 4 amps in terms of current and 5 Volts fixed? I've made a power supply before with variable voltage however the amp output never went above 1A. Which ...
1
vote
1answer
67 views

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 ...
2
votes
1answer
153 views

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: ...
2
votes
5answers
236 views

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 ...
0
votes
2answers
337 views

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 ...
1
vote
0answers
2k views

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 ...
1
vote
2answers
477 views

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 ...
0
votes
2answers
620 views

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 ...
0
votes
3answers
393 views

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?
1
vote
3answers
154 views

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 ...
2
votes
2answers
1k views

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 ...
0
votes
2answers
101 views

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 ...
1
vote
6answers
2k views

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 ...
0
votes
1answer
115 views

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?
1
vote
1answer
3k views

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 ...
1
vote
1answer
1k views

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 ...
0
votes
1answer
2k views

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 ...
4
votes
2answers
913 views

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 ...
2
votes
3answers
348 views

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 (...
3
votes
1answer
757 views

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 ...
3
votes
1answer
532 views

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 ...
-1
votes
1answer
68 views

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. ...
1
vote
3answers
4k views

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 ...
2
votes
3answers
6k views

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 ...
1
vote
1answer
2k views

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 ...
-1
votes
1answer
109 views

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 ...
0
votes
1answer
2k views

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 ...
0
votes
1answer
470 views

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 ...
0
votes
1answer
408 views

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 ...
0
votes
1answer
83 views

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 ...
-2
votes
1answer
2k views

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.
0
votes
1answer
76 views

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 ...
0
votes
1answer
442 views

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?
0
votes
1answer
445 views

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 (...
2
votes
2answers
567 views

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 ...
2
votes
2answers
313 views

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 ...
1
vote
1answer
12k views

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 ...
-2
votes
1answer
385 views

Detecting open circuit, very low power

We need low power consumption (1nA - 1uA) while the circuit is closed, and then wake the microcontroller when the circuit is opened. A the moment the design includes a custom metal switch which will ...
0
votes
3answers
6k views

Wiring of a USB Y-Connector [duplicate]

Recently I bought an LG External DVD Writer that is TV compatible. But after a couple of times it stopped working on my Sony LED TV. It would start spinning, but stop after two seconds. This would go ...
0
votes
1answer
77 views

Using european telephone cables for own DC power delivery

I have european telephone cables running through my walls to each room, without any connection/socket. Well... we really do not need any hard line telephone connection and I am into DIY projects, so I ...
0
votes
1answer
55 views

Need help making a forced air heater

I would like to make an electric heater. It will have a 20" Lasko Box fan at the back, pushing air passed the Kanthal A1 resistance wire. I would like to use 120vac. It will dissipate 1000 watts, and ...
-1
votes
3answers
633 views

Variable low voltage AC supply for heating element

(I'm a begineer in electrical stuff). My wife needs a transformer for a leather electric creaser. The transformers sold on the market are ridiculously overpriced (more than 250€). I don't ...
2
votes
3answers
257 views

Presensitised-PCB Build Method

After completing many basic circuits on stripboard and premade PCB I've decided to try my hand at making my own PCB. Following some other forum posts this seems do-able but will likely take some trial ...
-1
votes
3answers
359 views

Need to build a compact power supply that runs off the 240V socket and provides 12V, 5V and 3.3V for an Arduino Project [closed]

I want to have an as-compact-as-possible (but no limit on size) power brick/supply that takes power from a UK Wall socket and has multiple outputs with different voltages. Need 12V@2A for stepper ...
0
votes
1answer
202 views

K018A DIY Kit 200V 500W Light-Dimmer Module - will it work w/ 120v or is modification required?

K018A DIY Kit 200V 500W Light-Dimmer Module - will it work w/ 120v 60Hz? Or does it require modification to do so? Bought this DIY Kit for further practice with my soldering iron, and also to tone ...
2
votes
2answers
722 views

Smallest 2 Pin AC outlet socket [closed]

For a home automation project I need to source panel mounting electrical outlet sockets which are as low profile as possible and are rated at least 200 watts. Something like a female version of these ...