Hobby Electronics Basics

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Resistor wattage selection

HI, I am bit confused as to determine the wattage for a resistor. They come in 1/4, 1/2, 1, 2 watt etc.. I want to to a...
25 comments posted 20yrs
posted by lera
25 comments posted 20yrs posted by lera

Alarm Power Cut-Off Circuit

Hi everyone, I've got a burglar alarm that works off a 12V DC transformer. The only trouble with the alarm system is wh...
5 comments posted 20yrs
posted by mark.hodgkinson2
5 comments posted 20yrs posted by mark.hodgkinson2

How good are high-end Extech DMMs?

X-No-Archive: Yes I'm interested in some of their top end DMMs as they have features that you simply can't get with any...
19 comments posted 20yrs
posted by itsme.ultimate
19 comments posted 20yrs posted by itsme.ultimate

EAGLE and simulation

I'd like to mess around with some op amp circuits - is it possible to use a simulator with EAGLE schematic files, or is...
19 comments posted 20yrs
posted by a
19 comments posted 20yrs posted by a

Reactor inductance measurement

Hi, i need to measure the inductance of a 70kVA linear reactor. What are the most cost effective (e.g. cheap) options?...
8 comments posted 20yrs
posted by a3aan1111
8 comments posted 20yrs posted by a3aan1111

555 timer

Hello, Is it possible to gt 10% duty cycle with a 555. I went to this web site: http://ourworld.compuserve.com/homepages...
10 comments posted 20yrs
posted by lera
10 comments posted 20yrs posted by lera

part search

hey people, I am looking for a specific part. I was wandering what are the technique you use to find a specific part. I...
2 comments posted 20yrs
posted by lera
2 comments posted 20yrs posted by lera

external clocking signal

Why do some satellite modems require an external clocking signal? (i.e. 10 MHz)
3 comments posted 20yrs
posted by mike7411
3 comments posted 20yrs posted by mike7411

Soldering iron construction?

I'm curious how soldering irons are made up inside ..? Esp what kind of material is used to insulate the resistive heate...
12 comments posted 20yrs
posted by pbdelete
12 comments posted 20yrs posted by pbdelete

Relay confusion

Hello all, Today I was introduced to the wide world of magnetic relays (for SPDT switching applications)... .Push a cur...
20 comments posted 20yrs
posted by rover8898
20 comments posted 20yrs posted by rover8898

PCB Designing Software

Hello everyone, Can you please let me know where to download free version for PCB designing. Cct which i want to make ha...
12 comments posted 20yrs
posted by prateekprashar2003
12 comments posted 20yrs posted by prateekprashar2003

Impedence matching: antenna-line-load

This regards antenna for radio. There is something not clear from info online and books on antenna design. Impedence ma...
11 comments posted 20yrs
posted by dlwebb
11 comments posted 20yrs posted by dlwebb

proxy

Hi, i have to select a proximity switch for an application. What's the difference between NPN PNP no and nc. Thanks
3 comments posted 20yrs
posted by dfbbgh
3 comments posted 20yrs posted by dfbbgh

Help with AC motor wiring diagram

I have an older AC motor that I would like to hook up to 230v. There is a wiring diagram on the motor but I cant make s...
5 comments posted 20yrs
posted by scottmeckley
5 comments posted 20yrs posted by scottmeckley