Questions tagged [diy]

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

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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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2 votes
3 answers
722 views

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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Swapping potentiometer gas pedal with hall effect ... signal voltage is the same but ECU has issues still

I’m doing a car motor swap (Nissan VQ37VHR into BWM E46) and would like to retain the OEM gas (a.k.a. accelerator) pedal. My initial investigations indicated the BMW pedal would work happily with the ...
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2 answers
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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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2 votes
1 answer
87 views

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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1 vote
1 answer
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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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1 answer
90 views

What type of wire can I use to run 5V, 30A to my Arduino controlled relay module over a distance of 10-12m?

I'm building an Arduino-controlled Christmas light show. I power my 16-channel relay module with a 5V, 30A supply. It is placed outside the house and I want to place its power supply powering the ...
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1 vote
1 answer
127 views

6 pin B50K potentiometer: DIY alternative?

I have a 6-pin B50K potentiometer used for the Bass/Treble control of a desktop speakers set. This pot is broken and getting this piece is costly to get (price, time - mainly from China). I don't need ...
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2 answers
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Can you power a smartphone (no battery at all) by a power supply alone?

I have a project in mind, where I need alot of parts that quickly would make this project really expensive. Then I thought that, all the parts I need is already in a smartphone, but I don't need a ...
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2 answers
68 views

I have made a 50W solar mppt charge controller, but don't have a solar panel. What can I use to replicate this without a solar panel

It's a 50w solar charge controller. I'm using an Arduino-based system with the ACS712 current sensor. What other inputs could I use to replicate the functioning of a solar panel to test the ...
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3 answers
88 views

Regarding the use of non-compliant and unconventional connectors in route to a 120v outlet receptacle? [closed]

I'm not sure how to word this so bear with me thank you. I'm rewiring my generic 65w Pen style soldering iron power cable and it would be very convenient if I could first solder it onto a 1/4" ...
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61 views

I can't switch on both coils in double arc lighter transformer

I was trying to make DIY plasma lighter (and kind of made it too) but I can't figure out something. The transformer has 2 primary and 2 secondary coils so I made a NE555 signal generator with 36 kHz ...
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3 votes
1 answer
152 views

Is this a valid design of an audio power amplifier with bipolar transistors and no capacitors?

I'm concerned about input/output capacitors in power amplifiers and their destructive impact on the sound-wave. In my understanding, for simple transistor DIY amplifiers you'll need a really big ...
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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 ...
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216 views

How to stop LED EMI on capacitive touch sensor TTP223

I am trying to make a piece of wood touch sensitive. I have a piece of wood carved with runic letters. I inserted LED's inside then filled the letters with epoxy resin. When I touch one I want the ...
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2 answers
156 views

APA102 LED strips behaving weirdly and flickering towards the end

I am trying to make a 29 x 29 LED matrix to display animations using the APA102 (Dotstar) LEDs with an Arduino MKR Vidor 4000 as a microcontroller. I have connected the data and clock signals of the ...
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1 answer
74 views

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 ...
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1 vote
1 answer
205 views

DIY protection board for lithium-ion batteries. How to scale a schematic?

I need to build a DIY protection board for a university project. We are not allowed to buy one online so I have to construct it myself. I have found a variety of schematics accomplishing the same ...
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8 votes
2 answers
717 views

Drill through PCB or just use glue to mount component?

For a one-off hobby project I want to add a potentiometer to an existing two-sided PCB. There is an unpopulated zone (as far as I can tell) on the PCB that looks ideal, but I'd have to drill mounting ...
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0 votes
1 answer
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Can't make simple oscillator based on NE555

I apologize for a very stupid question, I'm very beginner in electronics. I wanted to make a simple oscillator based on NE555P chips I ordered from local store, but struggling to make it work. I found ...
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0 answers
153 views

Why does my USB-C PD trigger circuit not work in tandem with a DC-DC voltage step up module?

Good day internet humans, I am pretty new to the world of diy electonics, and am in the process of putting together a DIY portable computer monitor built from an lcd panel from an old laptop and a ...
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0 votes
1 answer
74 views

DIY: emulate button-press on garage door remote

I have a 3-button / 3-door garage door remote powered by a 3V CR2032 battery. I would like to use it in a DIY project where, by connecting it to a 3V circuit, I hope to programatically open/close the ...
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62 views

DIY LED Fixture/Panel Design Questions - 1. How to control each RGB channel (COB) or 2. How to cool a panel of 40 meters of LED strips

I'm looking to build a 1kW LED light fixture for an experimental photographic process. I need 1kW fixture or around 100,000 lumens because of the low sensitivity of an emulsion. I'm wondering if ...
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3 votes
0 answers
114 views

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....
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Detect if external LED is on from ESP8266

Intermediate DIY-er needs advice. I'm trying to detect if my Air Conditioner power indicator LED is on from ESP8266 microcontroller (Wemos D1 Mini). The indicator LED is on a small PCB module with a ...
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Off-grid solar panel setup for estimated 15kWh daily consumption

I am planning to setup an off-grid solar panel system. I've read Off-grid solar setup, but I am looking for clarification on my understanding on how to go about it in the most cost-efficient way. I ...
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1 vote
2 answers
311 views

Combining two speaker channels (left + and -, right + and -) into a TRS style cable (left, right, common/ground)

I'm currently building a portable stereo speaker and have run into some issues. The speaker is based on a set of broken Jabra Move headphones (used as bluetooth receiver) and a XH-A232 amplifier board....
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97 views

Is it safe to reconnect burnt wire in tower fan?

I have a tower fan which was starting and stoping at intervals. Taking it apart, I found that a wire connecting the mains plug to the appliance has burnt in half. You can see the blue wire at the ...
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1 answer
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What is the maximum voltage and current audio sockets of a phone can withstand without damaging the phone?

I want to make an oscilloscope which can measure signals of any voltage upto 50V. Is it possible to make a circuit which can do this safely without damaging my smartphone?
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36 views

I have an MZ4 thermistor, I can't find info about the value of capacitance

I have bought a self assembly kit for power source (based on the LM317). The provided small thermistors are tagged as MZ4. I did my research but couldn't find the datasheet. The PCB is showing them to ...
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12V Alternator charger using MOSFET with 3 x 12V output charging serial connected batteries ( 3 x 12V)

I am planning of building charger for trolling motor that will charge from single alternator 12VDC three serial connected batteries with three individual 12V outputs. This is something that is ...
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3 answers
95 views

Splicing 6+ Wires

My project contains a 12V parallel circuit and multiple switches. What is the preferred way to splice 6+ 12AWG wires together. My first thought was using butt connectors with 3 on each side, but at ...
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2 answers
130 views

Low cost position detection using a diy "encoder" [closed]

I'm building a machine that is adjustable, so there is this mechanical arm that can be in 5 different positions. I was thinking on building a custom encoder, I can easily make holes in each position ...
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1 vote
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164 views

How Can I Get a Stable Triangle Wave With Adjustable Frequency

I am trying to make a wave generator. It will have switch modes for frequency between 1.6kHz to 1.6Hz with x10 increments. Everything is set except the triangle wave. I use a wien birdge oscillator to ...
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-1 votes
2 answers
139 views

Is it possible to connect each and every pin of two IC's together and increase perfomance?

I am a newbie to electronics. I have a crazy idea in my mind to create a PC with 32 bit microcontrollers. I chose the ATSAMV71J20 chip. The processor has a maximum CPU speed of 300MHz. If I connect ...
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59 views

BDCM for small DIY overhead stirrer, how to choose based on Kv?

I want to make a DIY overhead stirrer, to stir a glass of 5 Litres of pure water to bewtween 100-2000 rpm using a common impeller. I want to use a brushless DC motor (BLDC) to drive the impeller. ...
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86 views

DIY electronics projects powered by Sony NPF batteries

I'm looking into making some DIY projects to be powered by the Sony NPF series of batteries. These batteries are usually found in photography and video equipment. The issue is I can't seem to find ...
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2 answers
377 views

DIY portable bluetooth speaker; charging/battery question

I'm new to this and i'm doing my first real build for a friend. What I got so far: Amp: ZK-TB21 Here BMS 3s 40A balance Here 18 18650 battery on 3S pack 2 x 25W generic speaker and 1x30w tangband ...
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2 answers
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DIY charger: solar panels in series or in parallel?

I am working on a DIY project where I am thinking of using a small solar panel to charge my iPhone. I know iPhone chargers usually are 5 W, 5V at 1 A. I can see two small, portable, and easily ...
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1 answer
137 views

BLDC Coil Sizing / Moment of Inertia

I am currently building a bldc motor and am trying to gauge the amount of force the coils in my motor would need to generate. In order to move a desired load - to a particular speed. Without taking ...
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54 views

DIY BLDC - power supply sizing?

I am currently in the process of building a sensor-less 3ph axial flux BLDC with concentrated windings. I’m thinking 12s10p but have not yet decided. It’s just for a project - not for real world ...
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2 votes
2 answers
93 views

Using capacitors to make LED lighted dice

I've had this idea for quite a while, as I got the idea from The Stormlight Archive book series, in which they have marbles that glow. I have a limited understanding of electronics due to some intro ...
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2 answers
86 views

I'd like to know if my own version of a cell balancer will do the job

I have two 3.7v cells in series to make a 7.4v battery. I want to make my own active balancer because I don't have access to buying any cell balancers. I'm using a transformer with 2n turns on the ...
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