Questions tagged [diy]

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

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2
votes
1answer
77 views

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 ...
1
vote
1answer
46 views

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 ...
0
votes
0answers
54 views

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 ...
-5
votes
2answers
74 views

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 ...
0
votes
2answers
91 views

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 ...
0
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3answers
67 views

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 ...
0
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0answers
24 views

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 ...
2
votes
1answer
24 views

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 ...
0
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0answers
55 views

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 ...
2
votes
2answers
54 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 ...
5
votes
3answers
6k views

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 ...
3
votes
5answers
3k views

UV solder mask sticking to cover instead of PCB

I'm doing the usual DIY PCB process. Lately I got some of the chinese UV solder mask (similar to the one used in this video). I can work with it just fine - it sets under my UV lamp perfectly, within ...
0
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2answers
59 views

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 ...
5
votes
10answers
1k views

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 ...
2
votes
2answers
1k views

Schematic for a lipo battery bleeder overcharge protector

OK, so I am building a 12v (really 11.1v) 10000mah lipo battery. I am going to use it on campouts to run things like 12v fans and car chargers and run other high-current devices that couldn't be run ...
-4
votes
1answer
849 views

Converting a wireless mouse into a wired mouse [closed]

I saw this question in one of the electronics sites, and many answered him that converting wireless mouse will damage the PC's USB ports . The question on those websites was: I am trying to convert a ...
0
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1answer
20 views

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 ...
0
votes
2answers
1k views

Has anyone built an rs232 to usb converter?

I want to implement serial communication into one of my projects, but I'm hesitant to use a serial cable due them them being exceedingly hard to find nowadays. I found an old converter and took it ...
0
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0answers
46 views

Drill alignment error in diy CNC

I have made a homemade CNC for double sided pcb protoyping. I use flatcam to convert excellon files in gcode and then use UGS to send this gcode to arduino. I tried to drill a pcb size 180x140 mm ...
0
votes
4answers
95 views

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 ...
0
votes
1answer
40 views

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 : ...
1
vote
1answer
51 views

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 ...
1
vote
4answers
4k views

Is there any formula to get number of windings for a 50W voice coil of a speaker?

Is there any formula to calculate number of windings to get a 50 Watts voice coil of a speaker? let's say, I want to wind a 20mm diameter voice coil for a speaker. And my coil is made out of copper ...
0
votes
0answers
30 views

Modding dictaphone into guitar amp. Technically possible?

Hey y'all First post, first experiment with audio equipment, not very proficient in writing in english. I sincerely hope someone is even going to read this mess of a post. Because of circumstances, ...
0
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0answers
156 views

Homemade TRRS Adapter for Microphone Only

I have a wireless monitor with a 3.5mm headphone jack in it, and I'd like to take the output from that monitor and stick it into my computer such that I can record it. However, I have only a TRS-to-...
-4
votes
1answer
109 views

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 ...
-1
votes
1answer
122 views

Combining Solar Panels Safely

I have a solar panels, with 5v with a 200ma output, I have it so this goes to a charge module which allows 3.7v lithium batteries to charge without exploding on me. If i hook another solar panel, same ...
0
votes
1answer
37 views

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 ...
0
votes
2answers
892 views

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
votes
1answer
95 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 ...
0
votes
3answers
107 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 ...
0
votes
1answer
55 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 ...
0
votes
0answers
62 views

Can I use an Ethernet-cable in my DIY rpi project and run 5V / 8A through it?

I'm building a light installation and would love to use a sleek fabric-wrapped cable. As I need at least 5 cables I thought of using an Ethernet-cable as they come in nice forms and shapes. The ...
0
votes
1answer
97 views

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 ...
2
votes
1answer
143 views

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 ...
0
votes
2answers
140 views

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 ...
0
votes
1answer
58 views

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 ...
4
votes
1answer
28k views

Diy 18650 4s battery pack [How to charge, how to build?]

I'm building a bluetooth portable speaker. However, I have some questions about building my first 18650 battery pack. I have 4 pcs of Panasonic unprotected NCR18650B 18650 3.7V 3400mAh. My goal is to ...
23
votes
3answers
9k views

What went wrong with my DIY project?

I have been teaching my son the basics of electronics by taking apart his old toys. We got to the level where we can fix things and put them back together. Last weekend we spent several hours putting ...
0
votes
1answer
52 views

Understanding Power/Current/Voltage drawn by LED Strips

I am trying to create a LED lamp which will be powered up by a battery. Lets assume I want it to run the lamp for 1hr. My LED Strips operate at 12V with 19.2W/M. I am using around 1.7 Meters(198 LEDs) ...
1
vote
1answer
88 views

PCB electroplating then etching

How can I protect the through holes copper which is electroplated from being etched away by the ferric chloride? Is there a resistive solution or it`s just the conductive ink.
2
votes
0answers
58 views

RF signal Multiplier or Chopper

I'm trying to design a circuit that "multiplies" two signals. I have an electrical unit with two separate circuits. One circuit drives the other one with a square signal. The width of the square ...
4
votes
1answer
91 views

Choosing LED brightness

I am planning to build an electronic fencing scoring apparatus for training purposes in our club (so no FIE certification required, it's a pure hobby project). For hit indication, I want to use a ...
0
votes
1answer
97 views

Whats the simplest heating surface for a DIY project

I'm trying to make a very small (3x3 cm or less) cup or surface that will heat to around 200C. The surface needs to be dry and I only care about heating the surface and not any particular volume of ...
3
votes
3answers
233 views

Running a brushless DC motor on low rpm using servo tester

Background I'm working on a gift for the wife for Christmas - an electric bobbin winder (a winding machine/spooling machine) - which will work in the same way as this machine: It winds yarn on ...
0
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0answers
69 views

Adjustable voltage doubler circuit across resistive load…doable?

Disclaimer: what I am proposing is dangerous, and I know that. I would discourage anyone, regardless of expertise from undertaking such a pointless risk to their health and home. After my recent (mis)...
0
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0answers
31 views

IR Proximity Sensor Not Responding

I'm trying to build an IR proximity sensor using a simple tutorial found online. Here is the schematic and here is the link of the tutorial : https://www.instructables.com/id/IR-Proximity-Sensor-1/ ...
0
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0answers
22 views

Converting camcorder internal microphone to external pluggable via jack

I am trying to convert excellent microphone from sony vx1000 camcorder to external one pluggable via jack. I removed the microphone and was able to find schematics I tried connecting jack directly ...
16
votes
9answers
4k views

Cheap and safe way to dim 100+ 60W Incandescent bulbs

For my wedding reception, we are building ~25 lighting fixtures with 4 bulbs each (fixture per table for dinner). For aesthetic and budget reasons, these are 60w "Edison-style" bulbs which we want to ...
1
vote
2answers
128 views

Correct solar panels to pick for drone-mod

After this, I think I will take a course on electrical engineering (fuzzy from school days). I'm trying to add some flexible panels (they were <14g a panel)) to my drone (HS120D), to possibly give ...