Hobby Electronics Basics

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antenna grounding

I'm about to get of the cable tv merry go round and am installing an antenna on my roof. The problem is that the servic...
20 comments posted 16yrs
posted by jfisher864
20 comments posted 16yrs posted by jfisher864

AC DC Power supply

I need to power a Bill Changer acceptor. This is just the part the accepts the bills. It requires +5VDC, +12VDC, -12VDC...
4 comments posted 16yrs
posted by uriahsky
4 comments posted 16yrs posted by uriahsky

How supply power for changing number of LED?

A friend wants to use some LEDs in something she is designing. She may use 5 LEDs or she may use 20 LEDs. It may even t...
10 comments posted 16yrs
posted by -invalid
10 comments posted 16yrs posted by -invalid

SMPS for audio amps

This is probably a silly question with an obvious answer to those who know: Why are audio amplifiers seldom powered wit...
11 comments posted 16yrs
posted by pawihte
11 comments posted 16yrs posted by pawihte

120 volts ok in 100 volt extension cord?

I bought a 100 volt/120 volt step up/down transformer for some equipment I have in Japan. There is only one outlet on t...
8 comments posted 16yrs
posted by gg
8 comments posted 16yrs posted by gg

Did a BT135 SCR exist?

I live in a remote place where it's often impractical to try to get the exact part I want, either for replacement or fo...
7 comments posted 16yrs
posted by pimpom
7 comments posted 16yrs posted by pimpom

Ultra-powerful headlamp using LEDs?

I am looking to make or buy an ultra-powerful head/helmet lamp for nighttime in-line skating. It requires lots of light...
7 comments posted 16yrs
posted by jdoe
7 comments posted 16yrs posted by jdoe

urgent need OSRAM SFH480-2/3

Hy All, i need urgently 10.000pcs of OSRAM SFH480-2/3. Can you help me ? Any links of smart brokers ? thanks in advance...
0 comments posted 16yrs
posted by maurif
0 comments posted 16yrs posted by maurif

soundcard problem

This is a query about a good brand soundcard. It distorts any externally input recording, whether from radio, deck etc....
9 comments posted 16yrs
posted by kvsteve
9 comments posted 16yrs posted by kvsteve

welding

I `m trying to draw a power source. Do I have to weld with electricity tools? Aren`t any specific tools for electronics?...
7 comments posted 16yrs
posted by cesar.c.nfo
7 comments posted 16yrs posted by cesar.c.nfo

Connect microphone to powered computer speakers?

Is there a low noise (not necessarily audiophile quality) OEM amplifier that can be used to power an electret microphon...
2 comments posted 16yrs
posted by jdoe
2 comments posted 16yrs posted by jdoe

Setting Presets on Sony Dream Machine AM/FM Radio?

I've had the radio in Subject for years, and it's always been troublesome trying to set the resets. The power went out...
3 comments posted 16yrs
posted by wolftracks
3 comments posted 16yrs posted by wolftracks

zener diode info and ID ?

i have a suspect zener diode from a PS . Zener, because the PCB says it is (ZD901) it looks like a small signal diode a...
12 comments posted 16yrs
posted by some
12 comments posted 16yrs posted by some

Circuit Board Arc Track Repair

I have a 55 year old door chime clock and the board has carbon arcs which is causing a short. I have seen boards with t...
7 comments posted 17yrs
posted by newsgroups1
7 comments posted 17yrs posted by newsgroups1