Hobby Electronics Basics

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Transistor as a current limiter

Hello. I need to wire some leds, and I figure that a transistor for each series is a good way to ensure that the leds g...
110 comments posted 13yrs
posted by la
110 comments posted 13yrs posted by la

How do you make a LED to short itself?

;) -- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and far...
11 comments posted 13yrs
posted by toylet.toylet
11 comments posted 13yrs posted by toylet.toylet

Making DC battery Power

I asked a question about batteries and DC power adapter a few weeks ago and now I have a small (I hope) dilemma. I am u...
19 comments posted 13yrs
posted by meanie.brat
19 comments posted 13yrs posted by meanie.brat

Tying both inputs of an opamp to the output

Is there a possibility of something undesireable happening if *both* the inverting and non-inverting inputs of an opamp...
6 comments posted 13yrs
posted by Mimawl
6 comments posted 13yrs posted by Mimawl

Thought experiment-will this work?

I think I pretty much understand how induction motors work. A typical single phase motor has a start winding that is ap...
4 comments posted 13yrs
posted by etpm
4 comments posted 13yrs posted by etpm

Cruise control mod?

So I have this aftermarket cruise control in my car that uses the speed signal from the car to set the speed. It does n...
9 comments posted 13yrs
posted by etpm
9 comments posted 13yrs posted by etpm

which flux pen for solar cells

Hi! Are most flux pens good for soldering tab wire to solar cells or what should I look for? Thanks, Bernhard
1 comments posted 13yrs
posted by bernhard
1 comments posted 13yrs posted by bernhard

Amplifier for frequency generator

Hi. Im making one simple mcu based device that will work as electronic repellent. Nothing special. Only difference is t...
14 comments posted 13yrs
posted by goran.net
14 comments posted 13yrs posted by goran.net

DC 17V from PC power supply?

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V...
22 comments posted 13yrs
posted by toylet.toylet
22 comments posted 13yrs posted by toylet.toylet

Security System

I am looking for an inexpensive home security system that I can install. All I need is: several wireless battery operat...
3 comments posted 13yrs
posted by spamnot
3 comments posted 13yrs posted by spamnot

HELP: Issue with Powering a Door bell on a Relay

Hello, So I have put together the following circuit found in the link and everythi ng with the regular part of the circ...
9 comments posted 13yrs
posted by asuero2010
9 comments posted 13yrs posted by asuero2010

Help with battery installation

My wife has an electric yarn spinner which operates from 120v outlet and converts to a 12v 1.2 amp(max)DC power. Per th...
8 comments posted 13yrs
posted by meanie.brat
8 comments posted 13yrs posted by meanie.brat

Help with Bill Bowden Game Show Who's First Circuit

I really need your help. I embarked on assembling one of the circuits poste d on the page, specifically the Game Show W...
2 comments posted 13yrs
posted by asuero2010
2 comments posted 13yrs posted by asuero2010

Soldering 550m of copper wire

I have to solder 550 - 600m of 1mm copper wire. Wire must be completely covered with solder. It will take some time to...
46 comments posted 13yrs
posted by goran.balajic
46 comments posted 13yrs posted by goran.balajic

1 mm^2 PV Cell

A 100 microwatt PV panel shouldn't cost too much on a production basis. Bret Cahill
15 comments posted 13yrs
posted by BretCahill
15 comments posted 13yrs posted by BretCahill