Hobby Electronics Basics

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why are hard drive platters reflective?

The head doing the reading doesn't care if the platters of a hard drive are reflective, so why are they? I assume it's...
10 comments posted 19yrs
posted by terra1024
10 comments posted 19yrs posted by terra1024

DAQ module isolation safety reality check

We'd like to use a National Instruments USB-6009 DAQ module for measurements of current/voltage in an electronic load a...
5 comments posted 19yrs
posted by jmuchow
5 comments posted 19yrs posted by jmuchow

source for carbon commutator brushes ?

any suggestions on source for small carbon brushes (small quantity) i did do a google search.... lots of mfg sites or f...
12 comments posted 19yrs
posted by some
12 comments posted 19yrs posted by some

Alternative voltage reference?

Hi! I would like to know if there are other means to setup a voltage reference. I came up with this circuit: http://bay...
12 comments posted 19yrs
posted by mr.whatever
12 comments posted 19yrs posted by mr.whatever

Battery Charger Temperature Cutoff

I built a NiMH charger based on the Maxim 712 chip some time ago. I didn't implement the temperature cutoff part of the...
1 comments posted 19yrs
posted by none
1 comments posted 19yrs posted by none

clocking start and stop times for runners

I NEED HELP! I WOULD LIKE A CIRCUIT TO RECORD A RUNNER'S TIME. The times would not necessarily have to be accurate, but...
5 comments posted 19yrs
posted by piscatory
5 comments posted 19yrs posted by piscatory

How hot should NiMH's get in the charger

New subscriber here. I have a set of Sony AA size NiMH's that are the original batteries which came with the charger. U...
4 comments posted 19yrs
posted by BeardedOccam
4 comments posted 19yrs posted by BeardedOccam

Connector terminology

I'm trying to find a particular style of wire-to-PCB connector, but I don't know the terminology to find it in the cata...
5 comments posted 19yrs
posted by randy.day
5 comments posted 19yrs posted by randy.day

synchronous rectification/current limiting

I wanted a synchronous recitifier for a voltage regulator in an old- style dc generator on an antique truck (to block t...
3 comments posted 19yrs
posted by kellrobinson
3 comments posted 19yrs posted by kellrobinson

Zener Diodes / Voltage Regulation

I'm having some confusion regarding zener diodes which I hope somebody much brighter on the subject can clarify somewha...
14 comments posted 19yrs
posted by fyberoptic
14 comments posted 19yrs posted by fyberoptic

What is the ball for ?

When I drive from state to state, I notice some balls hanging at above 100m above the ground, on the high voltage power...
3 comments posted 19yrs
posted by mowhoong
3 comments posted 19yrs posted by mowhoong

question about motor controller amp rating

have a sewing machine motor controler (wired in series) that uses a "carbon pile element" where pressure on the pile ca...
6 comments posted 19yrs
posted by some
6 comments posted 19yrs posted by some

Switching 24vac

Hello. I would like to interupt a circuit several times a second. The circuit carries 24vac to a solenoid circuit under...
14 comments posted 19yrs
posted by alp31415(put "
14 comments posted 19yrs posted by alp31415(put "

Help needed with 24vdc to 12vdc

Hi all, Sorry if this seems a bit noddy but a few simple questions.. I have a unit that expects 12vdc at about 500mA.I...
7 comments posted 19yrs
posted by stew.dunn
7 comments posted 19yrs posted by stew.dunn

JVC KS-FX621

Hi friends, i have one car audio system. Model name is JVC KS-FS621. My main problem is I don't know how to set time in...
0 comments posted 19yrs
posted by rchatterjee75
0 comments posted 19yrs posted by rchatterjee75