Hobby Electronics Basics

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Old JCPenny Garage Door Opener/Receiver

I just moved into a house which has an automatic garage door opener installed. However the previous owners did not leav...
1 comments posted 19yrs
posted by firas_ghantous
1 comments posted 19yrs posted by firas_ghantous

Need help in understanding a circuit

Hi, I'm relatively new to electronics and I'm trying to understand the following circuit: http://elm-chan.org/works/vlp...
2 comments posted 19yrs
posted by kasterborus
2 comments posted 19yrs posted by kasterborus

Stepper motor question

1) I have a stepper motor in mind : http://tinyurl.com/2qr4d9 I'm guessing since it has 6 wires that it has 2 coils. Bu...
6 comments posted 19yrs
posted by orangepic
6 comments posted 19yrs posted by orangepic

Mosfet

How are the pins of a mosfet identified please. The project requires a 45V/16A Schottky diode or similar. I cannot find...
4 comments posted 19yrs
posted by dewhurst
4 comments posted 19yrs posted by dewhurst

metal fence alarm project

Hi, I would like to install an alarm system on a metal fence (it is made of 15 metal wires horizontal spaced about 5inc...
10 comments posted 19yrs
posted by lerameur
10 comments posted 19yrs posted by lerameur

Low Resistance Measurement

What is the recommended procedure for measuring low resistances? My DMM seems to wander all over the place depending on...
15 comments posted 19yrs
posted by spamfree
15 comments posted 19yrs posted by spamfree

Power Supply Rectification and Smoothing

I'm building a power supply for a 36V, 500W DC motor to drive a small lathe. I have scrounged a transformer from an old...
1 comments posted 19yrs
posted by spamfree
1 comments posted 19yrs posted by spamfree

"P dissipation" for caps?

Resistors are rated by 2 parameters: ohms and (W). Capacitors are rated in (C) and (V). It's taught to make sure that (...
12 comments posted 19yrs
posted by nada
12 comments posted 19yrs posted by nada

Current meter using GMR

I've come up with some ideas that use GMR (http://en.wikipedia.org/wiki/Giant_magnetoresistance) to measure current flo...
0 comments posted 19yrs
posted by gi4nospam
0 comments posted 19yrs posted by gi4nospam

Need for inductive kickback diode

If you are using PWM to control the brightness of an incandescent light, should you use an inductive kickback diode to...
10 comments posted 19yrs
posted by bakalorz
10 comments posted 19yrs posted by bakalorz

Coil driving

What's wrong with this picture? TTL control lines with small current sinking capability (say 20ma) need to activate ele...
15 comments posted 19yrs
posted by first.i.last
15 comments posted 19yrs posted by first.i.last

Scaling A Pots Voltage

Hi, I have a motor controller board that uses a 5K pot for speed control/setting. The problem I have is that my joystic...
3 comments posted 19yrs
posted by mQiQcQhQaQeQlQ
3 comments posted 19yrs posted by mQiQcQhQaQeQlQ