Hobby Electronics Basics

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Counting The Spots

I just bought a new strobe light for an experiment in biofeedback; supposedly it can flash up to 10 fps but I need to k...
18 comments posted 18yrs
posted by ryon
18 comments posted 18yrs posted by ryon

Capacitor dilemma

I have this circuit that I am trying to make and it calls for a 47uf and a 68uf electrolytic capacitor. Now unfortunate...
3 comments posted 18yrs
posted by kmvgroups
3 comments posted 18yrs posted by kmvgroups

How do I hook up my potentiometer?

I have a 500k ohm POT and I will be using it to vary the voltage of a circuit I am making. It is basically a motor whic...
19 comments posted 18yrs
posted by kmvgroups
19 comments posted 18yrs posted by kmvgroups

mic to headphone connector

Hi, is there a lead/connector that connects the headphone outlet of a device to the mic port of another device. I am wo...
2 comments posted 18yrs
posted by aamirghanchi
2 comments posted 18yrs posted by aamirghanchi

ONKYO HT-SR 875 no audio

Will clicking my heels bring my audio back? Tried everything else.Blu- Ray picture works through it just fine but, no au...
2 comments posted 18yrs
posted by ecastile
2 comments posted 18yrs posted by ecastile

Issues with a stepper motor drive

Hello folks, I am facing some issues regarding a stepper motor drive. The stepper motor I have is a 20KG 12V DC L/R Ful...
6 comments posted 18yrs
posted by chaudhari.chetan
6 comments posted 18yrs posted by chaudhari.chetan

Novice LED questions

Hello all, so I am looking at the back of a package of common LEDs (yes, from Radio Shack, I have my asbestos flame sui...
2 comments posted 18yrs
posted by biscuitbecks
2 comments posted 18yrs posted by biscuitbecks

RF shielding

I want to shield electronics in a plastic box from RF. My first thought was to get some copper foil tape with conductiv...
7 comments posted 18yrs
posted by 1qazse4
7 comments posted 18yrs posted by 1qazse4

FM deviation measurement

Could someone please describe to me the calculation behind FM deviation measurement using an oscilloscope? I've made th...
3 comments posted 18yrs
posted by s
3 comments posted 18yrs posted by s

Can I use 4 scr's as a ordinary rectifier bridge ?

I have a bunch of old 80 amp scr's (GE C46h) out of an old lighting dimmer I would like to use 4 of them to make an ord...
15 comments posted 18yrs
posted by argyle1nospams
15 comments posted 18yrs posted by argyle1nospams

Can I measure AC vampire current this way?

I'd like to measure how much current various plugged-in devices draw when they are "off". I have a digital multimeter t...
32 comments posted 18yrs
posted by gh424NO824SPAM
32 comments posted 18yrs posted by gh424NO824SPAM

Op-amp circuit help

Hi everyone. I have a simple need, but don't know how to do it. Let's call the input signal Vi and the 1st output Vo1 a...
6 comments posted 18yrs
posted by reginald.louis
6 comments posted 18yrs posted by reginald.louis