Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
363 questions
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Very old dual coaxial TV outlet, how to fix it to connect to a modern TV? [closed]
i've recently moved into an older updated apartment building and want to connect to the TV outlet but have a connection that i've never seen before. Can someone point me in the right direction of how ...
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2
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2
answers
351
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Why do my LED lights require a different voltage when they are hardwired?
I have a cheap set of LED string lights. There are 20 lights, all wired in parallel connected to a small battery bank. There are 2, 3V batteries wired in series, providing 6V of power to the string.
...
- 143
4
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3
answers
822
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Matching number of LEDs to power supply
I have an LED power supply - constant current with output 1.4A/96W/23-69VDC. I want to buy a number of LEDs and connect these in series.
What do I need to calculate to know how many of the following ...
-1
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1
answer
135
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2 LEDs on 1 SPDT switch
I'm a beginner who saw a video from YT channel DIY Perks about hooking up a 3w LED to a phone and decided to try it, changing it a little bit.
The basic idea is getting power from a phone using a USB ...
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1
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0
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53
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What programmable board should I use for my project? [closed]
I have a small project going on, you can call this a research project that I needed to pass a certain class。 But the thing is, I don't know what I should use Arduino? Raspberry Pi? Im a complete ...
- 155
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1
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99
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Building a voltage adjuster circuit
I've been trying to build an op amp circuit that takes an analog signal from my electric guitar of around -1.5 to 1.5 V to a voltage level of 0 to 5 V, so that I can put it into the ADC of a ...
- 143
1
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0
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214
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Removing one strip of LEDs from panel
My LED panel broke (it is a ceiling lamp).
I disassembled it, and it looks like this:
It has a series of LED strips (the last one is missing in the image), connected in series. There are connectors ...
- 111
1
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0
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57
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Electrical energy transformation
I'm working on a DIY solar inverter.
The goal is to make the battery connected to it rechargable by both energy from solar panels and AC mains (if there is power supply.)
My battery is 24V DC, AC main ...
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2
votes
0
answers
125
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Approaches to creating better mouse pointing hardware for absolute input?
I play the video game osu!. Osu! is a game that requires the player to quickly move the mouse pointer to different areas of the screen in a precise manner.
A game such as osu! lays out unique ...
- 21
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1
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80
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What type of battery is this?
I want to start this DIY project. According to the video, you need "2S 7.4volt battery and DC jack". What battery is this?
https://www.youtube.com/watch?v=cpdjQ0gheDQ&feature=youtu.be&...
- 205
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1
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619
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DIY guitar pedal schematics
I'm trying to build these 2 pedals:
http://byocelectronics.com/lilgrayodschematic.pdf
http://byocelectronics.com/lilcompschematic.pdf
both circuits have these parts separated from the "main&...
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1
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199
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What's the secret to "real" oscilloscopes
Okay, so at some point we've all connected things to a sound card input or an arduino analog input pin and said "look, mom! I made and oscilloscope!"
And, yes, technically you can get a ...
0
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1
answer
120
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Components for smartwatch [closed]
I am relatively new to the smartwatch manufacturing process and I am not hardware engineer. I have seen few videos on DIY smartwatch. Following is what I have learned so far:
We need to manufacture ...
- 101
8
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4
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14k
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What is "switched neutral"?
In the context of mains power, and wiring a light and switch. I thought I understood it, but what I'm thinking of I believe is something else called a "switch leg". Disclaimer: I'm a ...
- 199
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124
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Can I avoid tripping my breakers with an superinductor?
I was thinking about creating a circuit with a large inductor to avoid tripping my breakers when I turn on an iron.
When I use the iron, if I slowly start it with minimum heat and gradually increase ...
- 507
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1
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103
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Hallway light switch makes bedroom light brighter [closed]
In an older North American home, when I turn my bedroom light switch on, the ceiling light turns on and seems fine. When I then turn the switch for the hallway light on, then the bedroom light becomes ...
- 199
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Making subwoofer for car, without amplifier
So, I have these two things and I want to achive a good subwoofer for my car: an 5.1 home theater system with a 20-30w 4ohm subwoofer and a radio player in my car with 4x45w 4ohm output for speakers.
...
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2
answers
237
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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 ...
0
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1
answer
55
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Building primitive FGMOSFET for educational purposes
To illustrate how flash memory works, I thought to build a primitive FGMOSFET and show that it stores a single bit of information (charged, uncharged).
It would require a high voltage to charge, it ...
- 185
0
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0
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223
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Repetitive Problems With DIY Arduino EEG
I'm a hobbyist with only minor electronics experience trying to construct an EEG machine as part of a basic brain-computer interface. I'm following this tutorial for a DIY EEG using an arduino, but I'...
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2
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254
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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 ...
- 121
0
votes
2
answers
239
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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
...
- 131
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2
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231
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Solar-powered DC motor for mini fountain
I'm working on a small water fountain that's powered by solar panels, and I would love some help identifying a root cause for a water pump dying. This is my build so far:
Water pump
Solar panels
I ...
- 103
2
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1
answer
621
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Guitar pedal works by itself but not in a signal chain
I just built a clone of an LPB-1 pedal, as my first ever guitar pedal project. It works great between my guitar and amp with no other pedals in the chain. When it is placed in a chain with pedals ...
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1
vote
1
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303
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Can you use 'Rubber,' Specifically Liquid Electrical Tape Between The Plates of a DIY Capacitor
The above is pretty much all there is to the question. By "can you," I mean will it be properly effective / are there any tips? If not, why? It seems that this ought to work, but I can't ...
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2
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605
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Pulsed DC From 'pure' DC (Via Switching System Without Moving Parts)
I want to create a circuit or mechanism that will let me switch the output from the starting value to 0 and back. My input is pure DC. I want to do this with fairly basic DIY supplies if possible (no ...
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0
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966
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DIY Bluetooth speaker circuit won't turn on
I'm making a Bluetooth speaker and made a schematic which I'm using to follow to build the speaker.
It's loosely based on this DIY video I saw online, here's the picture of the relevant parts I ...
- 211
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2
answers
3k
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Why are resistors necessary in a summing audio circuit?
I am researching DIY stereo audio mixers (2 input, 1 out) -- there's lots of info out there -- but all the passive solutions (e.g., DIY Multi-Input Audio) include resistors, and I don't understand why ...
- 103
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3
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116
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Even though the signal gets low several times a second why our eyes are only able to see the bulb glowing all the time
I was learning Pulse Width Modulation and it told me that it just the technique to change the amount of time the signal gets high in one wave, but why am I able to see the bulb glowing at all the time ...
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164
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CFL Ballast Calculate Primary Turns
There are online designs that use a simple ferrite bolt 50 turn primary and 500 turn seccondary powering one 5 watt CFL. I attempt to customize it with:
Specs: TDK Core
(source)
Vin primary= 6V DC
...
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2
votes
1
answer
106
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Camera - Auto Night Vision "Mode" (ON only when dark)?
I am wondering how night vision "mode" could be automatically switch on & off in commercial CCTV?
Something like this: https://www.youtube.com/watch?v=ilaXGtsx-DU
(video demonstrate CCTV ...
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0
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0
answers
73
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BMS battery build DIY help
I am making a battery charger for a speaker using 4 18650 3.7V batteries.
Now I know that I would need to get a 4S Lipo or Li-ion PCB, the only thing I don't understand is the current rating that I ...
- 211
2
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2
answers
83
views
Flashlight with 2 Switch without IC
I make a simple circuit with the use of Arduino and it works well, having an IC like ATTiny is good but i have a small space on my PVC Tube for DC-DC Step Down.
My goal is to make a flashlight that ...
- 121
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votes
3
answers
8k
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How does this circuit in an electric mosquito swatter work?
I had an electric mosquito swatter lying around so I decided to open it up and check out how it works.
I understood some parts of the circuit however I did not clearly understand how the rest of it ...
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2
answers
385
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3.5mm jack signal splitter
I need a solution for listening to music from 2 headphones/earphones on a single mobile phone. Using a speaker could be an option buy my girlfriend wants it this way. Anyway, while looking for a ...
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10
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3k
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Film/TV question: How to build Foam Cutter from only household items
I'm writing a scene for television and I need to make a foam/rope cutter from household items. I've watched several videos, including this one: https://www.youtube.com/watch?v=cM0lP2WCzY0, and ...
0
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1
answer
115
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Can I replace the 433mhz modules on my homemade remote controller with a nrf24 transreciever
I built a simple 4 channel 433mhz transmitter and reciever because I can't afford a remote controller, the range is limited to 3 feet and nrf24 transreciever have longer range, so my question is can I ...
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4
answers
228
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I want to reprograme my wirelss mouse so that it shall generate a nudge if it is on and inactive for 30s, is this possible? [closed]
My problem is that my work computer locks up if there is no activity for only a few minutes. One simple solution is to buy a wireless mouse (or even a wired mouse) that automatically sends a small ...
- 2,311
0
votes
1
answer
56
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Replace UR battery by IMR with lower mAh [closed]
I am replacing a shaver’s battery, a Braun Silk Epil 5.
It uses a Li-Ion battery manufactured by Sanyo for Braun.
According to my research it must be a UR Battery like the UR18500L :
...
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1
vote
1
answer
384
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Building a DIY projector. LED driver voltage output 24-36V, 100 watt LED voltage 32-38V. The LED driver is short 2 volts, would this matter much?
I'm in the process of putting all these pieces together to build a DIY projector.
Lens
LCD+Board
Fresnel
Condenser lens
LED
The only part I'm missing in this build is a compatible power supply unit ...
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1
answer
128
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Creating lung ventilation to fight COVID-19 [closed]
I'm just wondering why world has not enough lung ventilation systems to fight of COVID 19. I suppose it should be not very difficult to create DIY lung ventilation project. I suppose there should be ...
- 151
1
vote
1
answer
102
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Questions about designing my own BLE-controlled LED device
This project is meant to get me familiar with designing my own PCB and working with lower-level components. I have experience with BLE using Arduino shields and BeagleBones, but I want to try building ...
- 145
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2
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7k
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Routing power and HDMI signal into usb type-c for DIY computer monitor
I am starting a project to build a DIY monitor. I have a spare lcd panel (model # LP156WF6) taken out of a laptop. I plan on buying a controller board for it and building it into a homemade enclosure. ...
0
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3
answers
887
views
Is it safe and feasible to use a "damaged" transformer?
I want to make my own DIY spot welder, so I'm trying the instructions I found on several places (for instance, here, here or here) about using an old microwave transformer. I salvaged it from a broken ...
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3
answers
884
views
Is it safe to touch 8 volts?
Let me say first that i'm a noob in electricity.
I measured the voltage from my diy microwave-transformer-welder and it was 8.
I have no idea how much amps run through it but the fact that it creates ...
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0
votes
1
answer
370
views
Micro QR-code reading solution
I've tried to repair a headset, but I cannot identify the chipset because they used something that looked like QR code but smaller (wikipedia states that it's micro QR) and I have no solution to read ...
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1
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555
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DIY Powered USB Hub PCB
For my home project I need to connect multiple Arduino's to a Raspberry Pi. My raspberry pi controls everything in my house and the arduino's are going to be used to get sensor data.
I want to ...
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2
votes
1
answer
294
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Connect rectangle pad to jumpers
I'd like to know some general approaches to creating DIY connectors for a custom PCB or card. Mainly I'd like to know how to connect some flat SMD pads to standard jumpers that would connect to a ...
- 199
0
votes
2
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1k
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What causes a USB Cable to fry a PCB?
When assembling my own USB 2.0 spec cables, I haven't had any experience with frying PCBs they get plugged into (of custom-made keyboards primarily), but I hear stories of it happening. So I'm trying ...
- 273
1
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1
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206
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Advice on my Transformer
Background: I need a transformer that can supply 6.3V (+/-1%, as per the heater's specs) and 25 A for a heater.
As a result, I decided to hack a MOT by breaking off the bottom laminations and ...
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