Hobby Electronics Basics

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Dusk to Dawn Flashing LED

I would like to have somebody knowledgeable in electronics construct a device that would turn on at dusk and flash unti...
6 comments posted 21yrs
posted by dewarg**NOSPAM**
6 comments posted 21yrs posted by dewarg**NOSPAM**

Newbie question: circuit for harddrive indicator

Folks: I want to light up an ultra violet reactive 120mm computer case fan with UV LED's whenever my harddrive is acces...
7 comments posted 21yrs
posted by rwinder
7 comments posted 21yrs posted by rwinder

74HC123 and 74LS123

Im trying to build the project at http://electronicsworld.tripod.com/telephonesimages/12.gif Someone had told me that I...
17 comments posted 21yrs
posted by Martin
17 comments posted 21yrs posted by Martin

Electronic Sight Glass

Does anyone know how to build a simple device for detecting gas bubbles in a tube of flowing liquid.
5 comments posted 21yrs
posted by tomthacker
5 comments posted 21yrs posted by tomthacker

Q: pins on flyback transformers

I was about to toss out some old computer monitors, but thought to pull the flyback transformers for use in some of my...
3 comments posted 21yrs
posted by dlwebb
3 comments posted 21yrs posted by dlwebb

Quartz Trpple distrilled water

Hi Can anyone advise where I can get Quartz triple distilled water from (I'm in the UK) and what is it the best conduct...
11 comments posted 21yrs
posted by nospam-mail
11 comments posted 21yrs posted by nospam-mail

Looking for BB909A/BB909B Varicap Diode

BB909A/BB909B varicap diode. I bought a little FM transmitter to play with and ended up breaking this diode. I can't see...
1 comments posted 21yrs
posted by james.douglas
1 comments posted 21yrs posted by james.douglas

Halogen Lights Dangerous?

I told my wife I was going to buy a halogen desk lamp, and she protested that they are dangerous. I asked her why, and...
13 comments posted 21yrs
posted by wolf_tracks
13 comments posted 21yrs posted by wolf_tracks

Proper voltage setting for laptop car adapter?

I know nothing of electricity except that if you stick your tongue in a live lamp socket you'll get an instant perm. So...
3 comments posted 21yrs
posted by Infinity
3 comments posted 21yrs posted by Infinity

Philips TV service manuals available?

Are service manuals such as for the 27B800 available in digital (ie, PDF) format? Or only in paper form? From whom? Onl...
12 comments posted 21yrs
posted by me
12 comments posted 21yrs posted by me

Can any handheld be used to watch video?

My son has a Leapster handheld game thingy and I was wondering if it would be easy to modify it to accept a video input...
1 comments posted 21yrs
posted by wanton
1 comments posted 21yrs posted by wanton

Best RC snubber

I have a hydraulic valve on a break press, 115V approx 1A+ that when opened produces a nasty spike! This affects other...
1 comments posted 21yrs
posted by peter
1 comments posted 21yrs posted by peter

Range-finding ultrasonic / infrared

What's the best (cheapest, quickest, easiest) way to detect obstacles for a small robot? The book I have starts with in...
3 comments posted 21yrs
posted by danny
3 comments posted 21yrs posted by danny

How Does an Electric Dipole Generator Work?

Look at my very old physics book, I came across a description on EM that uses the idea of an electric dipole generator....
5 comments posted 21yrs
posted by wolf_tracks
5 comments posted 21yrs posted by wolf_tracks