Hobby Electronics Basics

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Sending a trigger pulse by RF

I'd like to send a simple trigger pulse by RF at irregular intervals (seconds to minutes). No other data need be sent....
21 comments posted 15yrs
posted by Pimpom
21 comments posted 15yrs posted by Pimpom

Activation of a LED light with a 15MV signal

Hi, For one my project, with the help of my ampere meter I want to activate my LED light with a signal of 15MV/A. Howev...
4 comments posted 15yrs
posted by nicoc82
4 comments posted 15yrs posted by nicoc82

gsm repair course

http://www.gsmrepaircourse.com
0 comments posted 15yrs
posted by bilgi
0 comments posted 15yrs posted by bilgi

How Low Can You Go?

I need to cram a TL499AC converter circuit into the smallest, tightest, area possible so I want to use 1/10 watt resist...
2 comments posted 15yrs
posted by ryon
2 comments posted 15yrs posted by ryon

2 pc ps outputs in series?

can you connect 12v output of at/atx supply to 5v output of the same or another at/atx or there are gnd problems? thank...
17 comments posted 15yrs
posted by anglomont
17 comments posted 15yrs posted by anglomont

Electronic circuit simulator

Just starting to study electronics again, after 50+ years. Had the vacuum tube stuff down pretty well when I was a teen...
21 comments posted 15yrs
posted by ivanvegvary
21 comments posted 15yrs posted by ivanvegvary

power diode testing?

Tested each of diode pair fch20u10 with analog ohm-meter: directly-open but with bigger direct voltage conducts, invers...
6 comments posted 15yrs
posted by anglomont
6 comments posted 15yrs posted by anglomont

Estimating Sinewave distortion

I cobbled together a discrete wien bridge oscillator using a Jfet and bipolar and a xmas tree light for AGC. I get a re...
6 comments posted 15yrs
posted by bperryb
6 comments posted 15yrs posted by bperryb

Finally! Match Filtering On Excel

Make a signal. Make some less than correlated noise Add the signal to the noise Use the signal as the reference. Take t...
9 comments posted 15yrs
posted by Bret_E_Cahill
9 comments posted 15yrs posted by Bret_E_Cahill

Ideas for pump and it's circuitry

I salvaged a pump that is used to inflate a bed. It uses a wired controller that you press to inflate and deflate. One...
9 comments posted 15yrs
posted by chocolatemint77581
9 comments posted 15yrs posted by chocolatemint77581

Re doof doof zapper

If it were radio sourced doof doof. What would happen if I put a spark plug in a metal reflector at source focal point...
6 comments posted 15yrs
posted by haggisz
6 comments posted 15yrs posted by haggisz

CD74HCT165 question

Hi, I have been trying to figure out how the CD74HCT165 works, the datasheet do not explain the CP,CE and CP ports. Can...
2 comments posted 15yrs
posted by lerameur
2 comments posted 15yrs posted by lerameur

signal generator output

OK, this is real basic but I'm not getting it. I hooked up my HP 8657A signal gerator into my TDS 210 oscope with RG 58...
64 comments posted 15yrs
posted by entropy4269
64 comments posted 15yrs posted by entropy4269

old remote circuit

Please see the following links for a pcb remote circuit. http://yfrog.com/jy3nmp http://yfrog.com/1fuh3p http://yfrog.c...
6 comments posted 15yrs
posted by kvsteve
6 comments posted 15yrs posted by kvsteve

Holey Circuit Boards!

It seems that every day, just a little bit more of Radio Shack's hobby supplies disappear. Now they don't seem to carry...
13 comments posted 15yrs
posted by ryon
13 comments posted 15yrs posted by ryon