Hobby Electronics Basics

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High pitch sound generator

Hi, I would like to build a home-made cat repeller, based on high pitch sound (18-19KHz and up) What's the simplest way...
14 comments posted 20yrs
posted by sblueeye
14 comments posted 20yrs posted by sblueeye

elec tutorial

electronic tutorial? snipped-for-privacy@hotmail.com advanced telesoft , Dan
1 comments posted 20yrs
posted by hkhellhkhell
1 comments posted 20yrs posted by hkhellhkhell

Spinning led displays

Here is a cool link I found interesting. http://hackedgadgets.com/2006/06/13/top-5-spinning-led-displays/ Full color gra...
0 comments posted 20yrs
posted by Jamesthompson2002
0 comments posted 20yrs posted by Jamesthompson2002

Recombination current

What is the recombination current? In a pn diode if there is small injection of electrons in p-semiconductor, a current...
1 comments posted 20yrs
posted by silla822
1 comments posted 20yrs posted by silla822

sharp aquous hdtv

Help.... I unplugged my TV to move to another location. When I plugged it back in, all I got was a blue screen. Anybody...
2 comments posted 20yrs
posted by baybuster
2 comments posted 20yrs posted by baybuster

SyStem on a chip

I would require a System On a Chip, SOC, which is using 200MHZ Pentium and plenty of RAM. any advice. ThankYou -iTiLLus-
4 comments posted 20yrs
posted by itillus
4 comments posted 20yrs posted by itillus

Question about capicitors

Will a capcitor allow DC to pass before it is charged up? This question is the result of a thread in a computer group,...
13 comments posted 20yrs
posted by raff242
13 comments posted 20yrs posted by raff242

tron box

I would like to slow down my electrical meter down with going into it,something thatI I can build.
23 comments posted 20yrs
posted by jahlove34
23 comments posted 20yrs posted by jahlove34

micro hydro load controller

Hello, I'm volunteering at a place out in the country who are living off the grid. They already have a couple of windmi...
5 comments posted 20yrs
posted by andy
5 comments posted 20yrs posted by andy

Battery for Winbook XLI Laptop

I contacted a battery store in Palo Alto about the battery for an Xli, and they said they no longer carry them, since t...
10 comments posted 20yrs
posted by wolf_tracks
10 comments posted 20yrs posted by wolf_tracks

How do i see the polaity on a npn transistor

How do i see the polaity on a npn transistor? i got a 2n2222 npn, and i am not sure how the polarity is. sry, but i am...
7 comments posted 20yrs
posted by ragnar_123
7 comments posted 20yrs posted by ragnar_123

MOSFET unity-gain freq

what can we make use of unity-gain freq? Isn't true we are expecting bigger gain? what's the point of unity-gain? there...
1 comments posted 20yrs
posted by patrick.zou
1 comments posted 20yrs posted by patrick.zou

12v Self reseting switch question

Hello, I'm an officer with a small volunteer fire department. I'm not an electrical engineer. We have a rescue van that...
8 comments posted 20yrs
posted by mark.gramlich
8 comments posted 20yrs posted by mark.gramlich