Hobby Electronics Basics

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Control unit for a proximity reader?

Hi! Does anyone know where to get a simple control unit for a proximity reader? I'm need to build a single door accessc...
0 comments posted 21yrs
posted by div
0 comments posted 21yrs posted by div

Pyroelectric Detector!

hello friends, I need ur help. I am using a PIR detector (IRA-E700STO SERIES MURATA) I dont get any changes in the outp...
4 comments posted 21yrs
posted by Raghunathan.Appavou
4 comments posted 21yrs posted by Raghunathan.Appavou

do frequencies have negative values

hi, why do i get a negative frequency in fourier transform of sinusoidal wave ? arent frequencies supposed to be +ve ?...
5 comments posted 21yrs
posted by brazingo
5 comments posted 21yrs posted by brazingo

Looking for newer equivalent of PIC16C84

I have a program written for a PIC16C84 microcontroller that I need to implement using one of the newer equivalents. I...
3 comments posted 21yrs
posted by kasterborus
3 comments posted 21yrs posted by kasterborus

Current transformer Wire wrapping

Im trying to build a current transformer from a U Bolt. I am a novice so be gentle. I want to detect 120 volts of curre...
18 comments posted 21yrs
posted by Bordon
18 comments posted 21yrs posted by Bordon

max gauss of a permanent magnet dc motor field?

I know there are some beefy servo motors of several HP, but at some point the gauss of the strongest permanent magnet f...
3 comments posted 21yrs
posted by bobgardner
3 comments posted 21yrs posted by bobgardner

Is there an equivalent of Maplin (UK) in the US?

Hi, I'm looking for a good US electronic component stockist - so far I've found only a few that cater to the hobbyist -...
5 comments posted 21yrs
posted by kasterborus
5 comments posted 21yrs posted by kasterborus

transform GHz to MHz so I can use my Oscope

Hi, I have an oscope that can operate at up to 100 MHz. My situation is that I want to measure the voltage magnitude of...
8 comments posted 21yrs
posted by letron_2000no__spam
8 comments posted 21yrs posted by letron_2000no__spam

step motors question

I want to operate 2 step motors together (the same steps) can i connect them in prallel to the same driver outputs?? (th...
1 comments posted 21yrs
posted by mrdan
1 comments posted 21yrs posted by mrdan

negative frequency ?

hi, how do i interpret fourier transform of a sinusoidal signal F[cos(w0*t)] = pi*[del(w-w0)+del(w+w0)] -- why is there...
1 comments posted 21yrs
posted by brazingo
1 comments posted 21yrs posted by brazingo

How do I convert 0-10V to -5V +5V differential?

Hi, I have a signal generator that is putting out a staircase wave 0-10V. I want this wave to drive a laser galvanomete...
12 comments posted 21yrs
posted by kasterborus
12 comments posted 21yrs posted by kasterborus

One for the computer folks

Greetings All, I have built two CNC controllers that are built around a PC. This has worked well but now I'd like somet...
5 comments posted 21yrs
posted by etpm
5 comments posted 21yrs posted by etpm

question about battery charging

We have a photo-voltaic system with a battery bank configured to 24 Volts. There were sound reasons for going this way,...
3 comments posted 21yrs
posted by arfh
3 comments posted 21yrs posted by arfh

Transistor biasing

I know this question has been asked a million times, but I've read all the answers and still don't understand. I've bee...
15 comments posted 21yrs
posted by sizzlefist
15 comments posted 21yrs posted by sizzlefist

tube matching question

Hey all; I just put 4 new tubes in my Carvin guitar amp and was wondering about matching. The current through the catho...
6 comments posted 21yrs
posted by toccata
6 comments posted 21yrs posted by toccata