Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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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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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 "...
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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 ...
CommunityBot
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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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Band selection circuit for SI4825 A10
Following the official schematic and guideline (AN738: Si4825/36-A
Antenna, Schematic, Layout, and Design Guidelines), I am building a Si825 A10-based radio receiver.
I am getting weak audio output ...
CommunityBot
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2
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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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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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Slowing cooker hood fan on lowest setting with resistive series load (or alternative)
My cooker hood has 3 settings, and the low setting is very powerful.
I want to make it less powerful to reduce the (high) noise but still provide some extraction.
I have dismantled the circuit to ...
CommunityBot
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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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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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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 ...
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Understanding Power/Current/Voltage drawn by LED Strips
I am trying to create a LED lamp which will be powered up by a battery. Lets assume I want it to run the lamp for 1hr. My LED Strips operate at 12V with 19.2W/M. I am using around 1.7 Meters(198 LEDs) ...
CommunityBot
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Astable Multivibrator using BC549s not oscillating
I just recently started learning about electrical engineering stuff, and since my final goal of building a Z80 Computer seems a bit far away, for now, I decided I'd make a simple clock I could ...
CommunityBot
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Need help identifying the 4 microphone wires in my laptop webcam
I am trying to adapt my laptop's webcam into a USB webcam. Although I couldn't find any schematics online, the manufacturer did print (I assume) labels to identify the 8 wires coming out of the webcam....
CommunityBot
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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 ...
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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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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 ...
- 171k
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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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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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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 ...
CommunityBot
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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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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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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 ...
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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 ...
- 1,347
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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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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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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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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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How do I check polarity on loudspeaker?
How do I check the polarity on a loudspeaker?
I have an 8 ohm 2 inch speaker with no wires soldered into it and the terminals have no markings.
How do I know which of the two terminals is positive ...
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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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How to drive this 5-pin speed controlled DC motor?
I am trying to build a turntable. I want to have 33/45/78 RPM, so I bought a motor that says it can do that from AliExpress.
The motor I got is called EG530SD-3F.
It has 5 pins, which run into some ...
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Connecting Headphone to Phone and Laptop via Switch
I am trying to build a small circuit which will connect my phone, laptop and headset with a switch.
So in state 1, the headphone and phone will be connected
and in state 2, the headphone and laptop ...
CommunityBot
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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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Designing a Dew Heater
I am planning to make a dew heater for a camera lens to get rid of condensation, using resistors wired in parallel, then distributing them around the circumference of the lens. Diameter of lens: 65mm
...
CommunityBot
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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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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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How to get 20 V from a USB-C charger?
I want to power my DIY stuff with a MacBook Pro USB C charger. The label on a charger says that it can provide three different power profiles:
20.2V - 4.3A
9V - 3A
5.2V - 2.4A
There is a ton of ...
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Mixing old and new Li-ion batteries in parallel: long term effects?
I have four lithium-ion APC batteries. They are all from the same facility and their condition seems to be alright.
I'd like to connect all of them together in parallel, but my question is this: Will ...
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What voltage should DIY laptop external battery have?
I want to make an external powerbank for my laptop, since its battery cannot be removed (MSI GP62M 7RDX).
What voltage should my battery have?
18650 elements have nominal voltage of 3.7.
My laptop ...
CommunityBot
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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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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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How can I follow the current in this DW01A circuit?
I try to understand the inner logic of this diagram, this a modified version of a schematic that I found online. I made the necessary calculations for my power MOSFETs and all but I have some ...
CommunityBot
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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 ...
- 171k
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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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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 ...
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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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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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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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Best DIY antenna design for increasing the range of a 2.4 GHz router
I am new to antenna design and this field in general. I am looking to design a WiFi antenna (less than 15 cm x 15 cm) that can effectively increase the range of a 2.4 GHz WiFi router.
It should be ...
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