Hobby Electronics Basics

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switch question

Is there anyway to turn a momentary on push switch into a SPST?.. so that if you push it once it keeps the circuit on.....
4 comments posted 20yrs
posted by noen
4 comments posted 20yrs posted by noen

Force Sensing Resistance in Concrete

I'm looking for an implementation for detecting when a person walks over given sections of a sidewalk. Digging up and e...
3 comments posted 20yrs
posted by nascortechnologies
3 comments posted 20yrs posted by nascortechnologies

Reversible Linear Alternator - Linear Motor

Would it be easy to reverse a linear alternator into a pulsating linear motor assuming the right input frequency? It doe...
2 comments posted 20yrs
posted by BretCahill
2 comments posted 20yrs posted by BretCahill

grounding questions

Can the below be done safely? I have two circuits running 2 different sources.. space is limited and if I can get away...
11 comments posted 20yrs
posted by noen
11 comments posted 20yrs posted by noen

Radio controlled switch

I want to switch a light (or a circuit controlling a light) on and off from a distance of nearly 20km. There is line of...
20 comments posted 20yrs
posted by a
20 comments posted 20yrs posted by a

MUF VS Critical Frequency

Can someone tell me what is the difference between Max Usable Frequency and Critical Frequency? The question has to do w...
1 comments posted 20yrs
posted by papageorgiou40
1 comments posted 20yrs posted by papageorgiou40

TV antenna amplifier power injector

Hi, I'm trying to hook up an active antenna that needs 5V at 30ma to be fed thru the coax, to a tuner that doesn't prov...
5 comments posted 20yrs
posted by removethis
5 comments posted 20yrs posted by removethis

discharging

I have been working on a project here, I thought it was simple but now I come to a dead end. I used a 555 timer with ou...
49 comments posted 20yrs
posted by lera
49 comments posted 20yrs posted by lera

Front panel printing

I remember once finding a site that offered an online service for printing stick on front panels on the sort of rugged...
8 comments posted 20yrs
posted by irwin
8 comments posted 20yrs posted by irwin

Info on weird current transformer

Hi, i am currently analyzing a three phase compounding current transformer, used in a generator field excitation system...
1 comments posted 20yrs
posted by a3aan1111
1 comments posted 20yrs posted by a3aan1111

What does "232" in RS-232 stands for?

Out of curioisty does someone know what does 232 stands for in RS-232. RS = Recommonded Standard. Thanks, -Sandeep
4 comments posted 20yrs
posted by sandejain
4 comments posted 20yrs posted by sandejain

Bubble etch tank - first board

Just made my first PCB using the bubble etch tank I made last weekend. Photos and associated ramblings at... http://lab...
16 comments posted 20yrs
posted by a
16 comments posted 20yrs posted by a