Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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Challenge- Starter Pistol to close contact on Timer remotely [closed]
Track Coach here.... My school still uses an Ultrak L10 to time meets and I am looking for a way to DIY a solution to simplify and standardize the start of a race. Currently we just have the "...
0
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2
answers
90
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Mod Projector to Power On when Plugged In [closed]
I have a projector (it's a VOPLLS M10) that’s hooked up to a HomeKit enabled smart outlet, but the projector doesn’t power on when “plugged in” / smart outlet is turned on.
The projector only turns on ...
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1
answer
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Rebuilding an Old Transistor Radio into a Bluetooth Speaker
I recently acquired an old transistor radio and I'm interested in transforming it into a Bluetooth speaker. I'm considering using a stereo amplifier kit that includes built-in Bluetooth, such as this ...
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Connect LED tapes using FFC or other flexible cable to go around obstacle
Two led tapes of width ~1cm sit 1cm apart. Between them in the middle, there's an obstacle around 3mm thick. I want to connect the LED tapes with a flexible cable that goes around the obstacle. FFCs ...
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DIY ATX Desktop PSU turns off after using full load fast
I have built a desktop PSU with a fuse, output connector and a buck boost converter. The problem is that when I set the maximum power of the converter at once, the PSU turns off automatically. However,...
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1
answer
154
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How to build DIY home energy backup system (UPS) [closed]
I have a home in a countryside where grid power cuts off very often (3-5 times per week) for a few hours, especially in a winter time.
I came up an idea to make a backup system that will automatically ...
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2
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64
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Double audio output
simulate this circuit – Schematic created using CircuitLab
Hello
i am trying to have the same audio play on two usb earphones, i have tryed multiple adapters but nothing work, the software force ...
1
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1
answer
54
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Power supply from socket to light-up bracelet
I'm pursuing a DIY project, creating a memory box for The Eras Tour that had LED wristbands. In said wristbands are 2 CR2032 (3V, 0.2mA) disk batteries on square metal plates connected by a metal ...
0
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0
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77
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DIY board: double-sided SMD vs. joining two boards flat together?
I have this rough layout for a design with some serious space constraints:
It has connectors on both sides and the layout rules out through-hole soldering. I only have access to a Hakko IR preheater ...
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0
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1
answer
37
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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 ...
1
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3
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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 ...
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2
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154
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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 ...
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1
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0
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47
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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 ...
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7
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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 ...
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2
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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 ...
5
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3
answers
741
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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 ...
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1
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1
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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 ...
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0
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1
answer
136
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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 ...
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2
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2
answers
361
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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 ...
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1
answer
94
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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 (...
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0
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1
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77
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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 ...
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1
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1
answer
78
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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 ...
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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. ...
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4
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449
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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 ...
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1
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146
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What is the "best" way to make a DIY 7 V rechargeable battery?
I have a device (the Wii "sensor" bar, basically an IR LED array) that the literature says takes 7 V. I can't find any battery offerings that come in 7 V, but many that are 3.7 V, so I am ...
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2
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1
answer
89
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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 ...
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3
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1
answer
215
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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 ...
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1
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1
answer
104
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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 ...
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1
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179
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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/...
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0
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1
answer
600
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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 ...
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3
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1
answer
493
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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 ...
2
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3
answers
88
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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 ...
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136
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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 ...
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1
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0
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131
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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 ...
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0
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1
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116
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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 ...
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3
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113
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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 ...
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1
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1
answer
124
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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 ...
0
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2
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530
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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, ...
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1
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0
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169
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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 ...
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0
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1
answer
161
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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 ...
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0
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3
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267
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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 ...
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1
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172
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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 ...
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1
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3
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317
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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 ...
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0
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298
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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 ...
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0
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2
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153
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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 ...
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1
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1
answer
115
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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 ...
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0
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76
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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 ...
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0
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1
answer
112
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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 ...
1
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2
answers
469
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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 ...
3
votes
1
answer
485
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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, ...
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