Hobby Electronics Basics

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Capacitor-selection

For my next project I've just built a PSU using a small 9V-transformer. Hooking it up to a Graetz-bridge for rectificat...
2 comments posted 19yrs
posted by bos
2 comments posted 19yrs posted by bos

What to use for timing in alarm circuits?

Hi, I would like to make a small timed alarm to gift a friend. What I have in mind is an input consisting of 3 'up arro...
4 comments posted 19yrs
posted by sundaryourfriend
4 comments posted 19yrs posted by sundaryourfriend

Can it work ?

For prevention on risk of handphone radiation, even in the standby mode, don't sleep near to your handphone and also do...
8 comments posted 19yrs
posted by mowhoong
8 comments posted 19yrs posted by mowhoong

Sine wave generators

What is now the easiest way to go for sine wave oscillators to work on fixed frequencies near the middle of the audio sp...
11 comments posted 19yrs
posted by dewhurst
11 comments posted 19yrs posted by dewhurst

Impedance Measurement

I would like to measure the resistance (impedance) of a soldering iron tip to ground with power on - When I use a stand...
6 comments posted 19yrs
posted by pete
6 comments posted 19yrs posted by pete

get fascinating games wallpapers and pictures

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1 comments posted 19yrs
posted by sexyhot123
1 comments posted 19yrs posted by sexyhot123

Testing an old welding rectifier

My uncle recently bought a 550a 3ph welding rectifier with the idea of converting his welder to dc. When he tried check...
6 comments posted 19yrs
posted by clutch
6 comments posted 19yrs posted by clutch

Generation of Ultrasound in the Megahertz region

Hello to the group, Does anyone know how I could generate sound waves in the Megahertz region? I would like to do a dem...
18 comments posted 19yrs
posted by nuisancewildlife
18 comments posted 19yrs posted by nuisancewildlife

How to make a LED flash together with the music BPM

Hi, i was wanting to construct a simple circuit where a led would flash together with a Music BPM. Does anyone knows how...
2 comments posted 19yrs
posted by gustavo.x
2 comments posted 19yrs posted by gustavo.x

VSWR doesn't matter? But how about "mismatch loss"?

What I gleaned from the excellent answers for the original "VSWR Doesn't Matter?" thread is that high VSWR doesn't real...
43 comments posted 19yrs
posted by billcalley
43 comments posted 19yrs posted by billcalley

two phase from single phase

Is it possible to create two phase(or more) from single phase using passive components(definitely not any motors) and m...
8 comments posted 19yrs
posted by Jon_Slaughter
8 comments posted 19yrs posted by Jon_Slaughter

Analog to Digital Converter

Hi guys i am in the process of trying to figure out how and where to start to build a Analog to digital converter for a...
5 comments posted 19yrs
posted by Peter.Basta
5 comments posted 19yrs posted by Peter.Basta