Questions tagged [diy]

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

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votes
2answers
608 views

Is it possible to run 230V LED - or flourecent “spiral-tube” - lightbulb with a 9V battery?

I would like to power a 230V LED lightbulb with a 9V battery. I assume I'll have to dissect it... Surely there must be some sort of power-converter and rectifier from 230V-AC to something a lot ...
2
votes
2answers
328 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 ...
0
votes
2answers
755 views

How do I get 12V 260mAh from 4x 6V 130mAh solar cell panels?

I'm trying to figure out how to build a DIY micro irrigation system for my small greenhouse. A part of that task is to figure out how I can charge 8 AA batteries using solar panels. I've found a set ...
0
votes
0answers
589 views

How to switch a transistor when a radio signal is received?

I have a circuit which switches on by sending current to the base of one of its transistors. I'm trying to make receiver which can receive signals from a AM transmitter and send current to base of ...
1
vote
5answers
469 views

How to cheaply switch between two sets of 7-input-wires?

I am trying to make a water level sensor. I want to use a single circuit for two water tanks. For this I need to be able to switch between two sets of 7-wire-inputs to the circuit (the 7 wires that ...
-4
votes
1answer
109 views

DIY headphone preamp [closed]

I would like to make an amplifier with following specs: input from TV RCA jack output 1-2 3.5mm jacks powered by USB volume control (if possible make it somehow wireless) As i am new to electrical ...
4
votes
1answer
598 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 ...