Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
330
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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 ...
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Battery dies in a DYI uninterruptible power supply [closed]
I put together an interruptible power supply using the following components:
AC/DC 15V power supply
Power source switch/charger
12V Lead Acid battery
12V Voltage stabilizer
The expected operation is ...
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2
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68
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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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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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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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3
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101
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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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63
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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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3
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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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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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2
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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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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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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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1
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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 ...
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2
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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
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1
answer
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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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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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49
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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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0
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IP5301 USB Negotiating?
Currently trying to get this board to simply supply me 5v through the USB terminals on the back.
https://a.co/d/3mZtA3k
I have the USB + and - hooked to a Wemos D1 Mini V4, and when I activate the KEY ...
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0
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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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1
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63
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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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1
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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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3
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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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98
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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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63
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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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2
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87
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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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How can I avoid twisting wires in a circuit that rotates?
I am working on a project where I used a hollow pipe whose one end has a circuit board so that the wires will go through the pipe to the other end completing the connections. That pipe has to be ...
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1
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60
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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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883
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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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2
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84
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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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3
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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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1
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302
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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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69
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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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2
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148
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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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59
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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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2
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462
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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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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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58
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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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920
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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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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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0
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66
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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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3
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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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