Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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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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901
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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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4k
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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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151
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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
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93
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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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140
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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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271
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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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488
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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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1k
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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
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580
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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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158
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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 ...
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962
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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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1k
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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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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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742
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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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339
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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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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
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1
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754
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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....
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781
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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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2k
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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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2
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2k
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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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495
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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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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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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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95
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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
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777
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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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190
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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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501
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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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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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148
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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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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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2k
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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
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260
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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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515
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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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121
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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
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165
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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
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100
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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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3
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305
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Troubleshoot DIY AM radio
I need help troubleshooting my DIY radio. I am following the schematic this link.
See pictures below for a diagram of how the components are wired and the actual wiring. The design I made is different ...
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1
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2k
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How to DIY a anti static bracelet or ground oneself?
My laptop battery inflates and no longer works. I buy a new one and plan to install it myself, but I don't have an anti-static bracelet. I don't want to shock my laptop with statics. Is it possible to ...
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258
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Remote Operation of Toggle Switch
I'm working in a laboratory environment, where we need to change the state of a few toggle-switches from time to time. As we want more and more remote control in our lab, these toggle-switches need to ...
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379
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How to choose a substitution transistor for a feedback amplifier?
I'm experimenting with RF feedback amplifiers (this topic is well covered in "Experimental Methods in RF Design" book, if anyone would like to know what that is). Particularly I'm interested ...
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100
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Help troubleshooting diy battery charge/protect/step-up circuit
I am following the schematic below trying to put together the circuit for a battery charger with over/under voltage protection and 3.7 to 5v step up.
I have populated only the battery charger part of ...
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363
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What makes it hard to build a powerful RF transmitter?
I was looking for a powerful RF transmitter lately but I didn't find many. They are low power (< 0.5W) or expensive.
I have a little understanding of a regular 433MHz transmitter's schematics. It ...
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4
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469
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Keeping a cheap, DIY transformer safe
I want to design a cheap but safe, low-wattage, always-on heater to keep a small space above freezing. (A small underground tunnel that the water pipe for an automatic horse waterer goes through.)
I'...
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2k
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Momentary switch on-off circuit
I am trying to create a circuit to allow me to switch a project on and off with the activation of a momentary switch (a momentary push button or reed switch, for example), but I'm coming up blank and ...
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3k
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How to use a 2.4 GHz chip antenna for ESP32 design
I am designing a circuit board that will use a 2.4 GHz SMD chip antenna from Molex. I am a n00b/amateur at PCB design so forgive my ignorance - does it work nearly the same as how a PCB antenna works?
...
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153
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USB Receiver switch between two PCs
I use two desktop PCs and one set of wireless keyboard and mouse (Logitech with the 2.4 GHz Receiver). I got tired of plugging and unplugging the receiver so I took two old usb cables, a usb socket ...
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166
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Can I sell and install homemade smart light switches legally?
I have designed and made prototypes for a smart light switch. It involves inserting a PCB into the work box behind the switch and is powered by the household AC.
The goal was to sell these locally and ...
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1
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366
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Looking for a way to connect wires to a breakout board without soldering
I'm looking to get a custom keyboard cable but there's a catch - my keyboard cable is currently hardwired. The solutions I've come up with are either to use a janky solution where I use solder splices ...
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3
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477
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Safety rules for DIY projects involving 220V
I'm planning to add some home automation to my home, using a 5V relay and most likely an ESP8266.
This will be used, for instance, to control the lights or the heaters, certainly through Home ...
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