Questions tagged [diy]
Do It Yourself. Build, modify, repair something without the aid of trained professionals.
24 questions
12
votes
6
answers
21k
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 ...
- 245
2
votes
3
answers
466
views
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 ...
- 411
0
votes
1
answer
122
views
which power supply rating do I use for my diy led light panel?
I'm building a led light panel using 24 x 18W SMD 5630 72LED Rigid Light Strip Tube Bar Lamp Bright White 12V 1800LM connected in parallel so whats the power supply rating
Specifications for each ...
- 1
0
votes
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 ...
- 117
6
votes
4
answers
70k
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 ...
- 173
5
votes
1
answer
26k
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 ...
- 382
3
votes
1
answer
1k
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 ...
- 63
3
votes
1
answer
5k
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 ...
- 33
3
votes
3
answers
2k
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 ...
- 403
2
votes
2
answers
351
views
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
2
votes
5
answers
444
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 ...
- 834
2
votes
3
answers
1k
views
How to measure voltage of a system with a different GND reference?
I want to measure and log the voltage of a "closed" system shown in the following schematic on the left side. This system has its own reference to GND which is not connected to the ...
- 175
2
votes
2
answers
12k
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 ...
- 273
1
vote
1
answer
2k
views
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 ...
- 41
1
vote
3
answers
8k
views
DIY Multi-Input Audio
Edited, see bottom of this post.
What would be the best method for preventing damage to multiple audio input devices that are connected to a home made audio patch panel?
Im wanting to make a device ...
- 11
1
vote
3
answers
10k
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 ...
- 21
1
vote
1
answer
232
views
Are there any problems with my circuit design?
I am new to designing circuits but I have spent a lot of time researching for this project. I have been designing an automated indoor garden for my home. To save space, there will be 3 gardens stacked ...
- 13
0
votes
0
answers
55
views
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 ...
- 673
0
votes
1
answer
12k
views
series charging three 18650 batteries with three chargers off the same 5V supply [duplicate]
being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from an old laptop battery. I want to make a balanced 3S charger with ...
0
votes
1
answer
7k
views
How to wire a three phase bridge rectifier
I am doing a DIY three phase AC motor power generation project. I can understand the basics of electronics, and also understand how the wires are wired in a single phase rectifier. However, for three ...
- 229
0
votes
3
answers
2k
views
Splitting mains power into multiple relay-switched circuits
Summary Introduction
My goal is to split a 1-gang mains power extension lead into three, have my Raspberry Pi plugged into one of the outputs, and have the Pi able to switch the other two outputs ...
- 103
0
votes
2
answers
3k
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 ...
- 103
0
votes
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 ...
- 1
-4
votes
1
answer
128
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 ...
- 151