Questions tagged [diy]

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

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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 ...
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 ...
10
votes
2answers
1k views

How this DIY High-Speed Probe doesn't reflect signals?

I am reading The Art of Electronics, page 809 and 810, where they show this probe: Which is a DIY probe, made out of a RG-178 coaxial cable, in series with a 953 ohms resistor. I wonder why the 953 ...
10
votes
3answers
39k views

Is there way to construct an 18650 battery pack with built-in balance charging? Or is balancing not very necessary?

This is my first post here. Err, I'm a DIY enthusiast especially in electronics. I'm actually building a portable Playstation 2 Slim with an IPS display, so that it would look like a Wii U controller....
9
votes
1answer
2k views

Soldering BGA components DIY

If I understood correctly, current BGA components contain solder balls under the package. Do I still need additional solder paste to put on the board, or the amount of solder on the component contacts ...
7
votes
5answers
7k views

How to get 20 V from a USB-C charger?

I want to power my DIY stuff with a MacBook Pro USB C charger. The label on a charger says that it can provide three different power profiles: 20.2V - 4.3A 9V - 3A 5.2V - 2.4A There is a ton of ...
6
votes
6answers
4k views

Techniques for building 'Bed of Nails' testing board

When testing a complete circuit board a 'Bed of Nails' can significantly reduce time and errors. What are some techniques for making a DIY Bed of Nails? ...
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 ...
5
votes
4answers
57k views

Mains LED light bulb flickers when switched off [closed]

We have LED bulbs in our apartment. In the bathroom, the bulb flickers on and off when it's switched off. Same when it was a CFL bulb before I switched to LED cause I hate CFLs. Our mains voltage is ...
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 ...
5
votes
4answers
764 views

Why did my homemade PCB turn out like this?

I did a first experiment with the UV-lamp + Transparency + Presensitized-Board method. Using a randomly drawn pattern, this was my (promising but unsatisfactory) result: What could typically be the ...
5
votes
6answers
2k views

Would it be possible to make a solid state transistor by hand?

I am curious, would it be possible to fabricate a modern BJT/FET transistor with hobby/garage tools only if size and aesthetics was not important? Which materials would one use and how would one ...
5
votes
3answers
273 views

What kind of equipment would I need to apply nonpermanent extension wires to test points of a PCB so I can access them via a microcontroller?

This is a DIY project. The title question is the first problem I'm considering, but the entire project is the goal I'm not an expert in hardware, but neither am I uninitiated. Put me at around an ...
4
votes
3answers
7k views

Safety when using ATX power supply as benchtop supply

I found many pages where people convert an ATX power supply to a benchtop power supply to give 12, 5, 3.3V. However the current output can be very high (several amps). When using this and you NEED ...
4
votes
2answers
961 views

Most efficient way to power a 5 V circuit from a 14.8 V battery

I am making a DIY Raspberry Pi laptop. So far I have found a suitable board that will drive my display (M.NT68676.2A). From research I have found out that it will run off of anything from 12 V to ...
4
votes
5answers
222 views

DIY generator. Simple and small

I have read many posts on this site and everyone seems very competent, so here I am... very new to this. I'm trying to learn how to convert a motor into a generator. I'm just getting a bit overwhelmed ...
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 ...
4
votes
1answer
696 views

How to apply solder paste with stencil in a 2 sided PCB?

I have seen lots of tutorials about how to apply solder paste using a stencil, but all of them only show how to apply the stencil to one side of the PCB. My current project is 2 sided and I would like ...
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 ...
3
votes
3answers
1k views

What are an amateur's options to put a high-end IC on a board? [closed]

I'm actually an experimental physicist who does software-development for a living. So my knowledge basically stops at writing micro-controller programs and putting them on a breadboard, and hooking ...
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 ...
3
votes
1answer
599 views

How to find connections on board? - DIY Keyboard from Old Laptop

I have a project that I have hit a wall on. I need your guidance! I need to find the spots on the board for the 4 USB connections. The attached photo is of the board. There are 4 connections I need ...
3
votes
3answers
11k views

How do I check polarity on loudspeaker?

How do I check the polarity on a loudspeaker? I have an 8 ohm 2 inch speaker with no wires soldered into it and the terminals have no markings. How do I know which of the two terminals is positive ...
3
votes
3answers
215 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 ...
3
votes
1answer
15k views

Creating a home made ultrasound transducer

I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
3
votes
3answers
1k views

Is my PSU design safe, what should I change?

Normally I would just go and breadboard the design out, but since this is using mains power, I would rather ask experienced people first. I want to build a desktop 170V DC power supply to fiddle ...
3
votes
2answers
585 views

Connecting home elliptical trainer to TV power

I'm attempting to use a TV addiction to help motivate an exercise routine. To do this, I am going to connect an elliptical trainer to the power of a television set (flatscreen). Here is my plan: I ...
3
votes
1answer
868 views

Maximize efficiency and brightness of diff color, cheap, 5m 5630 SMD LED strip lighting

I'm a science teacher and we are going to explore different design/effects of grow-light setups this year in class. I've gotten some great ideas for this project from reading from this stackexchange ...
2
votes
2answers
6k views

Problems trying to wire a USB-C cable

I have been trying to figure out how to custom wire a USB-C to USB-A cable for a while, with no luck.I have tried some different connectors, but wanted to get some outside ideas on what I might be ...
2
votes
3answers
7k views

50W Amp for 15W Speaker

I am building a portable speaker and I am looking for a decent amp for my two 15W Phillips speakers. It is tough to find an amp that is efficient and cheap so I was wondering if there is something ...
2
votes
2answers
355 views

Is this an RC filter in the circuit for a nightlight?

So there is this nightlight (a little flower that you plug in directly into a mains socket and switching it on gives you some light to light up your bedroom at night) which I dismantled and tried to ...
2
votes
2answers
583 views

Satellite detector and a mobile phone

A satellite dish with LNB connected to a satellite detector when powered by a 18v source could detect radio waves from satellites. I made one using the ppt here. The detector, (when it was not ...
2
votes
2answers
2k views

Help with fixing LED night light that won't turn off

Software guy here, with limited practical electrical engineering skills (barely used a soldering iron since the university). :) My daughter has a LED night light using inductive charging. After ...
2
votes
5answers
342 views

How to power up 50 LEDs? (DIY 'fireflies' project)

I want to install lots of tiny LEDs lights in my garden (at least 50). I DON'T want high voltage cables in my garden so I am thinking in getting a high power, low voltage transformer to power up these ...
2
votes
3answers
522 views

Put outputs of 2 computer power supplies in series?

I've been working to figure out an LED lighting project for my classroom for a while now, readings on this site has helped. One part of the solution is to combine in series computer power supplies (...
2
votes
3answers
4k views

An appropriate voltage regulator / limiter for a 5V solar panel for USB charging?

I'm building a USB solar charger for my tablet, which has so far worked well. I'm using a 5 Volt, 5 watt solar panel (same as this one), which outputs about 4.5V and 0.6A in real use when charging my ...
2
votes
2answers
336 views

Google Glass 3.5mm jack with battery neck strap

I'm thinking of improving my Google Glass by DIY building a micro usb to 3.5mm headphone jack with a battery connected to a neck strap out of parts from the internet. I've already built the neck ...
2
votes
2answers
757 views

transformer windings

I have a 900 watts transformer from a microwave, this used to have a secondary voltage of around 2000 volts (for the magnetron) but I removed it. I wonder if by using 15 turn secondary that will give ...
2
votes
1answer
138 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 ...
2
votes
1answer
469 views

What causes failure in longer USB cables?

I wired up some USB-C 2.0 to USB-A 2.0 cables, and tested the maximum length I could get out of them when connecting a PC (host, USB-A) to an external hard drive (device, USB-C). I got stable power ...
2
votes
1answer
4k views

Proper storage of ferric cloride PCB etchant

I etch about half a dozen printed circuit boards each year at home, using an aqueous ferric chloride AKA iron(III) chloride etchant solution. As I want to minimize the costs and hassle of buying new ...
2
votes
1answer
4k views

inkjet cartridge control [closed]

I would like to build this: https://www.youtube.com/watch?v=UjlHtHAN0DU I.e. a programmable stamp/printer that you slide along a piece of paper. I would like for it to use easily obtainable ...
2
votes
2answers
415 views

Acquiring an accurate clock input for my computer

Building a timegrapher is quite straightforward, it is nothing more than a piezo transducer connected through to an amplifier. However, in order to actually utilize the results, one need an accurate ...
2
votes
1answer
740 views

Metal enclosure for custom car stereo project

I'm thinking about developing a custom car stereo, and it surprised me that there's no DIY enclosures for this purpose. I've just found plastic boxes in the 1 DIN size which can be installed into an ...
2
votes
1answer
2k views

How to connect RJ45 (female) Link LED

I need a bit of help. I have some Jtron RJ45 sockets (do a quick search, for a better picture), and they have LEDs integrated. I want to connect these sockets to a PCB and get the internet in (added ...
2
votes
1answer
17k views

Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy): I have an earphone splitter for iphones that has ...
2
votes
2answers
2k views

Is there a simple way to DIY a coaxial male connector?

I have a 12V power supply that has a female coaxial plug like the one on the right in this image: I rigged something up with tinfoil just to see if it would work, but it's not ideal at all. Basically,...
2
votes
1answer
3k views

What's wrong with my voltage multiplier segment?

The moment I learned about voltage multipliers I was really excited. What an awesome way to kill yourself! I found a high voltage multiplier guide and using the image below, I created my first ...
2
votes
2answers
53 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 ...
2
votes
1answer
115 views

How did static charge ruin my control board?

We have a Thermia geothermal heat pump that was working fine up until we had a particularly bad thunderstorm. Lightning took out the power for a while and burned up a DSL modem, a router, and a IP ...