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Questions tagged [diy]

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

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How to find the matrix layout of an old EEPC keyboard

The title asks my question; how can I find the matrix layout of an old EEPC keyboard. I found an instructables about making a USB keyboard controller but it uses a Teensy microcontroller, and I think ...
ImTheBeemoPlush's user avatar
1 vote
3 answers
70 views

How to install a USB-C PD host port on my electric longboard (54.6 V)

Installing a USB-C Port on a Longboard for Charging I'm exploring options to install a USB-C port on my longboard to utilize its enormous ~400 Wh battery for charging my phone/laptop/anything. Initial ...
Zach's user avatar
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2 answers
112 views

How to connect the transformer in this three-tube DC regenerative shortwave radio from aliexpress?

I've bought a three-tube DC regenerative shortwave radio on Ali-Express/China just to try building. As far as I can tell all the parts are here except for one thing. A schematic. Has anyone tried ...
Rick Steiner's user avatar
1 vote
0 answers
37 views

Need Help with DIY Phase sequence meter

I have seen this video: https://www.youtube.com/watch?v=HyrhW_gnQEM and I am really interested in creating DIY version of this for induction motor. Surfed through internet, but could not anything ...
Ratnesh Aroskar's user avatar
6 votes
7 answers
1k views

What would cause desoldering braid to simply not work?

I'm trying to replace the triac in a floor lamp dimmer, and completely failing to remove solder from the pads with desoldering braid. I've desoldered plenty of times before, though admittedly not ...
Neil Steiner's user avatar
0 votes
2 answers
61 views

Automate home blinds with motor, potentiometer and 3P switch

I've been developing an interest for electronics and whenever I have free time I like to study it and tinker with whatever components I have at home. An interest in electronics + the annoyance of ...
pipocaDourada's user avatar
4 votes
3 answers
659 views

74LS161 miscounting

Following Ben Eater's 8-bit computer assembly, my program counter, which is built out of 74LS161s, does not count correctly. In trying to figure out the issue, I have completely isolated the circuit ...
bamboo1's user avatar
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1 vote
1 answer
74 views

Building a DIY BGA Rework Machine

simulate this circuit – Schematic created using CircuitLab I am trying to build a DIY BGA reflow machine. I have a very crude schematic, but the idea is run each of the 6 heating elements in ...
MacAttack1's user avatar
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1 answer
115 views

Trying to make a Pip-Boy like game with LED buttons on a breadboard

I'm new to making electronics and I'm having a hard time of going about this. I have had a little help but I'm stuck. The way I'm wanting to have the circuit work is there are 3 LEDs with 3 switches ...
Tonto's user avatar
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2 votes
2 answers
326 views

Will an isolation transformer have a noticeable effect on mains hum? Also critique my DIY transformer idea

(Uber-edit - it has come to my attention that I am an ignoramus. This post is being left in place not to highlight my stupidity in particular, but to serve as a warning for others who think ...
neural's user avatar
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1 answer
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Purpose of wires of ESC [closed]

I have a brushless sensored DC ESC. The Manufucturer doesn't have instructions. I probably know the purpose of every wire. The three thick wires are for the motor phases, the three wires together (...
user334991's user avatar
0 votes
1 answer
57 views

Calculator made from scratch [closed]

See, I know it might be a dumb question, but I would like an answer, however dumb it might be. I never did any electronics before. However, I had an idea in mind that even if I can't do it right now I ...
Melody's user avatar
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1 vote
1 answer
53 views

How to determine contacts to jump a SMD button on garage door remote?

I am attempting to control my garage door remote using a Raspberry Pi controlled relay. I have done this in the past with other remotes (i.e. the relay part is not an issue), but my new house's garage ...
Oliver Cooper's user avatar
0 votes
0 answers
18 views

Seeking Advice on Battery-Powered MCU Circuit with TPL5111 Timer and MOSFETs

I'm putting together a circuit using a TPL5111 timer to switch power to an MCU like a PICO or ESP32 from a LiPo battery. I've got two MOSFETs - one for turning the power on and one for turning it off. ...
Suresh Kumar's user avatar
0 votes
3 answers
141 views

Connect two old pulse-dialing phones

At work we have some old pulse-dialing (rotary) phones. We want to connect two of them to make a simple intercom. Whatever the number is composed (even one single digit) the other should ring and of ...
Mark's user avatar
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0 votes
1 answer
93 views

What is the "best" way to make a diy 7v rechargeable battery?

I have a device (the wii "sensor" bar, basically an IR LED array) that the literature says takes 7v. I can't find any battery offerings that come in 7v, but many that are 3.7v, so I am stuck ...
insaner's user avatar
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2 votes
1 answer
67 views

Trying to heat up 32-gauge nicrome wire

I was trying to heat up a nicrome wire (32gauge) using a 21650 lithium battery, and I have charged it. I have used jumper wires to connect all and joined the nicrome using wire connecting joint. The ...
Hanreet's user avatar
  • 21
3 votes
1 answer
141 views

Converting TO-263 to TO-220?

I’m trying to repair an amp where the power MOSFETS (HUF76639) are no longer available in a TO-220 package. They’re currently available in TO-263 package. I’m thinking of adapting the TO-263 package ...
Gregory's user avatar
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1 vote
1 answer
73 views

How to Test Battery Health in GRUNDIG VCP 3930 with a Multimeter, Arduino, or Raspberry Pi?

As a follow-up to this question, I own a GRUNDIG VCP 3930 vacuum cleaner (which uses a 25.2V, 2000mAh Li-ion battery) that has stopped charging properly. I am being told that the battery on this ...
Foad's user avatar
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1 vote
1 answer
92 views

How to improve my son's solar bobble head [closed]

My son has a minecraft solar bobble head (in this case a bobble Steve). Under light it swings a diamond sword this exact one (Puckator Officially Licensed Minecraft Steve Solar Pal https://amzn.eu/d/...
Jordan's user avatar
  • 13
0 votes
1 answer
283 views

Is my 4s2p pack connections correct?

I'm planning to build my 4S2P battery pack using 18650 lithium-ion battery cells. I need to make sure my connections and my battery pack is correct and safe before I make the connections. Here's the ...
Tune333's user avatar
3 votes
1 answer
484 views

Why am I not getting an output from this breadboarded phaser?

After following along with a hobbyist's video, I breadboarded a phaser. Unfortunately it seems my circuit is not achieving anything close to what the hobbyist achieved with his. I believe the issue is ...
Thxforhelping's user avatar
2 votes
3 answers
88 views

Using alkaline C cells to drive a pair of solenoids

I am working on a walking robot for my class in mechanical engineering. I have two 12 VDC solenoids that need to be actuated. Their resistance is 4 ohm so basically will require 6 amps @ 12V for the ...
remusconnor's user avatar
0 votes
0 answers
103 views

How to make a recent laptop touchpad work on PC with an external PS/2 USB adapter

I want to make a laptop touchpad work individually with a USB adapter, but failed, on a recent Thinkpad E14 touchpad part. Some articles on the internet said they succeeded connecting the touchpad ...
sdrkyj's user avatar
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1 vote
0 answers
110 views

Use 2s LiPo Battery as Battery Cell for Microcontroller

Is there a convenient way to use a large 2s LiPo battery (such as this one) as a power source for a microcontroller and LED strip? Specifically I'm looking for the ability to seamlessly switch between ...
ashbygeek's user avatar
  • 111
0 votes
1 answer
92 views

Is it possible to expose dry photoresist film to UV before applying to copper for etching?

I've looked at a couple of resources regarding etching PCBs using dry photoresist film and in each of the methods, the film is applied to the copper before the image is projected onto the film with UV ...
Daniel's user avatar
  • 365
1 vote
3 answers
98 views

Is there a latching switch that will activate by motion?

I am working on a mini flashlight project. I would like to avoid holes in the enclosure to ensure waterproof-ness so using a standard slide switch is not an option for me. I want to use a version of ...
16-bit-apps's user avatar
1 vote
1 answer
114 views

Custom i2c with Arduino UNO

For educational purposes, I would like to write my own i2c protocol. Is it possible to write a custom i2c library to communicate using regular ports, or should I use the SCL and SDA ports? Can I mimic ...
Anton Tsvayer's user avatar
0 votes
2 answers
245 views

How do I make a small shock circuit to incorporate in my artwork?

Essentially, I am making a sensory art piece involving many different materials that all feel different to touch. I want to incorporate a small section of metal that will deliver a small, ...
JSTN's user avatar
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1 vote
0 answers
110 views

How to prevent a nichrome wire from melting under variable energy?

I’m experimenting with a DIY “sand battery”. The “battery” is a pot lined inside with an insulator and filled with sand. The sand is heated by a nichrome wire placed at the bottom. The wire is ...
Sophivorus's user avatar
0 votes
1 answer
132 views

DIY Quadrature Encoder? [closed]

Really struggling with making encoders work in my leonardo board, i could probably go the 20 ppr encoder way but i need it to be optical and not electrical/mechanical. I was thinking about using 2 IR ...
tote46's user avatar
  • 9
0 votes
3 answers
228 views

Tips for soldering some wires into a PCB

I need to solder some wires into a PCB, im dont really master soldering small pads or pins, so i need some help. I have a question too, those pads are already tinned, soldered, so can i apply some ...
tote46's user avatar
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1 vote
1 answer
110 views

SSR with PCB design improvements

I have worked on this project of my own so I need to confirm that it will work Its a simple SSR with max. current rating of 20A (normal use will be around 13A) I use 40A TRIAC just for safe side(also ...
realprocess's user avatar
1 vote
3 answers
203 views

My 12V 10A circuit is not working properly

I'm still quite new to electronics and I wanted to build myself a 12 V 10 A power supply for a different project. I followed this circuit design since it looked simple enough for me. Did all the ...
iAmConfusion's user avatar
1 vote
0 answers
235 views

Detailed calculations for DIY SSR (solid state relay) circuit

I just want to understand the calculations for a DIY SSR project. I do know the components required but I don't know how to calculate resistance values for this circuit. Also, what is the output of ...
realprocess's user avatar
0 votes
2 answers
128 views

What is the cause of Arduino glitching in this DIY soldering station?

I was following this (Spanish/Spanglish warning) tutorial to create a DIY soldering station. I created the schematic, PCB and ordered the parts to assembly, used a cheapo 5 V and 24 V AC-DC power ...
Smaug's user avatar
  • 5
1 vote
1 answer
101 views

Whats a good DIY book to learn electronics? [closed]

my eldest son is in a curious age. I like him to be able to tamper with electronics, something I believe is very valuable (in terms of knowledge and learning) and has the potential to be ...
DaPhil's user avatar
  • 111
1 vote
0 answers
68 views

18650 capacity tester opamp voltages on inputs different

I assembled an 18650 Li-Ion capacity tester with an Arduino Pro Mini. Here is the schematic: When I set the discharging current to 100 mA in the code (which means there has to be 100mV on pin 3 of ...
pomm es's user avatar
  • 11
0 votes
1 answer
73 views

How much pressure can typical TEC modules withstand?

Since I have not found an answer online. Nor any data sheets specifying, I can conduct my own test. But why not then post it online for others to see, I'm sure others will be searching it in a ...
Google Admin's user avatar
1 vote
2 answers
272 views

How to approach controlling multiple sets of solenoid valves?

Please excuse me for asking basic questions as I am a newbie in this field and learning as I go. I have a project that requires simultaneous functioning of two solenoid valves. I require three sets of ...
Jacques Le Roux's user avatar
3 votes
1 answer
339 views

Can you separate the D+/D- wires from the GND/Vcc wires in a USB 2.0 cable?

I am currently designing a wiring loom which includes USB 2.0 cable within it. It is critical that the thickness of this leg is as thin as possible due to the constraints of my client. Unfortunately, ...
5ealy's user avatar
  • 33
1 vote
1 answer
143 views

Is there a momentary switch that cuts the signal only the very instant it is pressed?

I am trying to build a guitar kill switch that would behave like a typical momentary switch, but with a twist: I would like the audio signal to be interrupted only the very moment I press the button (...
SkyLagger's user avatar
0 votes
0 answers
53 views

24 V Door Bell Modification

I'm looking to create a custom doorbell and am looking for advice. I am retrofitting a traditional 24 V doorbell system. My output I'm looking to get when you depress the doorbell is 5 short bursts of ...
Jordan Davco's user avatar
0 votes
1 answer
100 views

Simple circuit to cut voltage below 14V

I would like to power a DIY bluetoothbox from a Bosch Professional 18v battery but they do not have a BMS as far as I know. So I need a way to cut off all energy drawn from the battery as soon as the ...
J.Doe's user avatar
  • 1
0 votes
0 answers
301 views

12-lead ECG circuit diagram

I am trying to build 12 lead ECG circuit for my project, so could someone explain to me what should I do about allocating the electrodes on this diagram? Where do they need to be attached? Source: ...
Nika Abashidze's user avatar
0 votes
0 answers
75 views

Convert a 5 pin Elno connector to a 3 pin XLR

I'm trying to modify a Elno laryngophone's connector (5 pin) to plug like a normal mic so I need to understand how to wire cable to a standard XLR connector, maybe somebody knows how to do? thank you
Frank Leaster's user avatar
0 votes
1 answer
243 views

Three Phase Transformer Design

I design single phase transformers, around 400W - 8000W, but now im lost because i have to design a three phase transformer ( delta - delta connection ). I searched, trying to find a page that can ...
samuel mattio's user avatar
1 vote
1 answer
151 views

How do I calculate the type and size of battery to use for this solar-powered USB charger?

I've been out of the electrical mathematics for a while and want to see what battery I need to do this. 5 V USB output, 5 V DC solar power panel (I do have two I could use together, assuming the ...
Serialthrilla's user avatar
0 votes
0 answers
61 views

How to recell a 60 cell 36V battery pack?

So unfortunately a disgruntled ex-housemate put a screw through my friend's electric bike battery pack. It has burst one cell so we're definitely not plugging it in. I think I'm capable of replacing ...
nattymcpatty's user avatar
0 votes
1 answer
48 views

Question about my small solar panels

I have some small solar panels and I wanna build a project. My project includes the solar panels and a phone power bank that has input of 2 A. Right now I have the solar panels connected to each other ...
Teo 1355's user avatar

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