Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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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 (...
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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 ...
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141
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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 ...
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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: ...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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I need help designing a low voltage DC to AC circuit
Can anyone help me design a circuit that will perform low voltage DC to AC conversion? Ideally, I would like to have
3 to 6 VDC input (using AA batteries)
Approximately 1 VAC output (less would be ...
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DIY Double Conversion Power Conditioner
I'm trying to build an AC-DC-AC converter similar to how an online double conversion UPS works, but I have a few concerns as I have only basic electronics knowledge and no real qualifications.
I live ...
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Electric guitar with active electronics and a DIY battery gauge
There is a primitive DIY battery charge monitor which blinks a LED after input voltage drops lower a certain level. Let's call it battery gauge. Also, there is an electric guitar with active ...
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Relay with AT89S52 microcontroller
I'm working on a project where I'm using 8051 microcontroller as a primary microcontroller which is interfacing with 4 relays. I have tested relays with two of my arduinos but when it comes to AT89S52 ...
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DIY project, encountering difficulties with solenoids
I'm currently working on a project that is supposed to dispense something out of a container after receiving an input.
I have a solenoid that connects to an interior hatch. It will open up a hatch ...
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Constant voltage for an LED lamp DIY project
I have a couple of 12V LEDs lying around, and some old 220V to DC 12V transformers. I want to build a little portable lamp.
The LEDs flicker: I guess the transformers are not delivering a constant ...
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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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Potting DIY precision resistors made from resistance wires
I'm making a decade box and I need 100 Ω resistors for the hundreds increments range. I'm quite picky; I want the resistors to have 0.05% tolerance. I've checked online and 100 Ω resistors with that ...
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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 ...
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Can we connect multiple devices to the mains with just 1 cable?
The project: An Arduino DIY Relay-controlled aquarium with a water pump, a heater, and a light bulb. All 3 have the exact same wires according to the EU standards: 1 "hot" brown wire and a ...
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DSO -138 oscilloscope no detection of signal [closed]
As a project, I got myself a DIY oscilloscope to practice some soldering skills. As it turns out after I did all the hard work the display worked fine but my input voltage was nonexistent. To give ...
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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 ...
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What winding pattern would be the most efficient for generating electricity?
I'm looking to build a hand crank or pedal powered generator for a personal project, almost completely from scratch. I'm making my own coils, and looking to see what pattern would be the best for it, ...
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Will this junk pile spot welder plan work? [closed]
simulate this circuit – Schematic created using CircuitLab
Like many other DIYers with a one-off need to build a few li-ion battery packs and can't justify buying a spot welder, I am planning to ...
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Ground wires from two solar charger/inverter systems connected to vehicle chassis at different points. Reasonable?
Two separate solar charger/inverter systems will be installed on a camper, each with a separate ground connected at two separate points on the chassis. Is this logical? The likelihood of them ...
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How to safely use Lithium-ion batteries in DIY projects?
Disclaimer: I am far from being an electrical engineer, I'm only a DIY enthusiast trying to stay safe.
I'm building a collection of sensors using little ESP-01 chips, but having them running free on ...
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415
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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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Powering 12 LED tea lights with recycled power adapter?
I have 12 tea lights that are each powered by a C2030 3 V battery.
Like many of us I have a box of various chargers and whatnot.
Is this as simple as finding one outputting 3 V and splitting it 12 ...
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3k
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Address/Data on a DIY GBA cartridge?
I am working on a project where I need to create a custom Gameboy Advance cartridge. It has the maximum 32MB of data, which will be on a S29GL256P flash chip, and will save on a 32KB FM28V020 FRAM ...
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189
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Make a doorbell louder? Bypassing in-built amplifier
I have a doorbell I'd like to make louder (existing speaker driver is ~2W).
I had an idea of intercepting the signal going into (or out of?) the amplifier chip and feeding those signals through a ...
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DIY fixed voltage solenoid inductor -- do more loops actually make the B field stronger?
I'm building a custom electromagnet. Given the fixed voltage, I'm wondering if there's actually a benefit to putting more wire loop layers in my solenoid given the trade-off of increased resistance/ ...
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Timer circuit does not work as intended (fixed)
I am trying to make a 1 Hz clock with a CD4060, a crystal oscillator and an Arduino UNO.
The problem is I am pretty sure the circuit does not work right. It oscillates but it is slower than 1 Hz.
I ...
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Analog motion triggered alarm design (amateur) - Seeking professional's advice
I've designed a circuit and I want to confirm if it will work. Below is the working:
A very low current, battery powered motion alarm.
User can set 3 timers (srm delay, alarm go off delay, alarm ...
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Is it possible to measure the Hall effect with a simple home experiment?
I came across a YT video where allegedly the Hall effect is measured.
No matter how I tried, I couldn't reproduce it. I used a lab power supply, applied up to 10 amperes of current. The voltmeter does ...
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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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Smoothing quickly changing current/power draw for easier measurement
I want to measure the power consumption of an IoT device with LoRa module.
I read quite a few posts about this topic and two issues come up regularly:
the high dynamic range needed and
the high ...
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Can I replace two run capacitors with a dual run capacitor?
In this unit https://ameristarhvac.com/wp-content/uploads/pdf/M4AC3-Air-Conditioner-Installation-Manual.pdf
Can I replace the 35 uF capacitor and the 6 uF capacitor with a 35/5 uF dual capacitor? If ...
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Charging DIY 3s1p Battery pack as NiMH replacement
I have an old appliance with a completely dead NiMH pack (about 0.2V per cell) and to blow new life into it I want to replace that with a lithium-ion pack.
The old pack was 12V so I was thinking of a ...
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DIY transformer winding, "Light bulb test"
I "hack" cheap "electronic transformers" for use as filament supply for my tube amplifier projects. They operate at about 50KHz so there is no audible hum (a particularly annoying ...
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Implementing A/D conversion circuit to a DIY clamp meter
I was looking for cheap clamp meter projects and found this one: DC non invasive current clamp for oscilloscope DIY.
After reading about this project, I noticed that it had a BNC output to read values ...
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Is there any electrical system simple enough to make yourself which has some kind of useful property like radio communication or basic computation? [closed]
I would like to make some kind of primitive system in the direction of a computer, from scratch.
Someone showed me you can use ferromagnets to do some elementary computation; the “states” are the ...
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What type of motor to use for a crank-style window opener?
I'm trying to build an automatic window opener for my crank-out style casement windows, but I'm a little stumped on what sort of motor to use. I need something with high torque and a good feedback ...
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How to measure voltage of a system with a different GND reference?
I want to measure and log the voltage of a "closed" system shown in the following schematic on the left side. This system has its own reference to GND which is not connected to the ...
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Is it possible to make an OFET in a home lab?
Is there a way to build an OFET at home?
(low tech, no deep vacuum and plasma, without toxic/hard to dispose chemicals)
What can be the minimum budget for that?
While conductive polymers are pretty ...
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Determining the type of magnet used in a hand-crank torchlight
I'm trying to design a DIY dynamo that recharges a 5V battery used to power some sensors. However, I am having some trouble with deciding on the arrangement of coils and magnets. Currently, I am ...
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LED lights become darker? [closed]
I build myself a light with many small LEDs. They are quite powerful. I superglued ever LED board (the LEDs where in parts of 3 on a small circuit board) to an aluminium piece to dissipate the heat.
...
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I need help with putting together a battery
I want to make a 14V, 5A battery out of DIY crystal cells. Each cell is about 1.5V and 0.3A
I know I can connect on series until I get my desired voltage, but I need to increase the amps.
Is there a ...
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Mini reflow oven advice
Hey all I am venturing into making a DIY reflow oven. Been looking at many different types/styles over the last couple of years and feel now is a good time to start one.
I originally planned on ...
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Can a flyback transformer voltage output be multiplied by a Villard cascade?
I'm trying to keep the setup rather simple for a high voltage power supply I'm making. I'll probably use a ballast to drive the flyback as opposed to perhaps a ZVS board -- feel free to critique this ...
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How to drive this solenoid + littleBits?
I have a 5V solenoid, and I am trying to power it from littleBits.
I had a littleBits servo bit and cut its wires. The orange wire should be control wire. The reason I want littleBits is because I am ...
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Adding 12V DC jacks to desktop UPS in order to connect ONU and router
I get a backup of only about 10 minutes when my FTTH ONU and WiFi router are connected on the 220V ports of my desktop UPS. So, in order to avoid the conversion loss, I want to install two 12V DC ...
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