Hobby Electronics Basics

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Constant Current Source Design

I need to design a constant current source of 0.1 mA. The load varies between 1Mohm and 1 Kohm. Using a constant voltag...
8 comments posted 21yrs
posted by confused.mind
8 comments posted 21yrs posted by confused.mind

What speaker?

The small radio's speaker jack is rated at 300 milliwatts minimum into 8 ohms. I have a choice of two 8 ohm speakers th...
3 comments posted 21yrs
posted by cprstn54zz
3 comments posted 21yrs posted by cprstn54zz

Buffer Amplifier's Questions

Dear all, I'm reading the chapter on "Voltage Buffer". It's stated that it helps to isolate the input from the load. >F...
6 comments posted 21yrs
posted by albertleng
6 comments posted 21yrs posted by albertleng

24vdc to 12vdc for remote deployment

Hi, My first post so excuse me if I sound a bit basic-I have a 12vdc comms device that I want to put in a remote cabine...
6 comments posted 21yrs
posted by stew.dunn
6 comments posted 21yrs posted by stew.dunn

Where can I get cheap 12DC power supplies?

Hi All! Hope someone can help me here I keep paying over the odd for power supplies from a well known components distri...
5 comments posted 21yrs
posted by scottiedog
5 comments posted 21yrs posted by scottiedog

24vdc to 12 vdc for remote deployment?

Hi, My first post so excuse me if I sound a bit basic-I have a 12vdv comms device that I want to put in a remote cabine...
4 comments posted 21yrs
posted by stew.dunn
4 comments posted 21yrs posted by stew.dunn

PCB etchants

I keep reading on various websites that 'Persulphate' is a better etchant than Ferric Chloride from Radio Shack, but I...
3 comments posted 21yrs
posted by Nigel Eddis
3 comments posted 21yrs posted by Nigel Eddis

Schematics drawn in text

Greetings, Could someone point me to a program that makes eletronic schematics in text form? I had one at one time and l...
3 comments posted 21yrs
posted by snoopy
3 comments posted 21yrs posted by snoopy

Strange Question

Hi, Ive seen something somewhere that you can send data through your AC outlets in your house from one to another. Is th...
3 comments posted 21yrs
posted by richard_harris_2
3 comments posted 21yrs posted by richard_harris_2

HOW DO I REDUCE 12 VOLTS TO 6 VOLTS

Im trying to reduce a 12v DC power supply down to 5v DC to power a computer CD-Rom. Can any1 help me??? Thanx Gareth
6 comments posted 21yrs
posted by <penny
6 comments posted 21yrs posted by <penny

PC Based Oscilliscopes

Anyone use these? Any recommendations good or bad? I am looking at some that have Scope, Meter, Spectrum Analysis, etc....
22 comments posted 21yrs
posted by james.douglas
22 comments posted 21yrs posted by james.douglas

OT:Incandescent "soft white" bulb coating?

Not exactly an electronics question, but I know some lighting gurus hang out here. (Google hasn't been any help so far....
5 comments posted 21yrs
posted by NoSpam
5 comments posted 21yrs posted by NoSpam

Simple Lie Detector with Digital Panel Meter

Hi I am looking for a simple lie detector cicruit for my son's science project. We have a Digital Panel Meter with a 0-...
2 comments posted 21yrs
posted by mansermin
2 comments posted 21yrs posted by mansermin