Electronics Forum / Basics / May 2008

I'm getting strange results from an optocoupler (aka optoisolator, and
this is the kind with transistor  output).  In brief: nothing I do
seems to make the transistor "conduct", except very feebly.
Here's my setup:

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    OK I'm putting an old radio in a new truck and the wiring harness
had to be slightly different. Bottom line: I've got about 5 extra wires
coming out of the radio. Now one of them powers the panel lights but I don't
know which one or how much power it needs. How would someone go ...

well i have to implement an intelligent lighting system. after
detecting the person from PIR sensors, light has to be switched on for
some time only at night time. Im using a 12 V battery as a power
source which is powered by solar pannel.

I would like to convert some output (ohm resistance?) from a
potentiometer to an on/off switch.
My electronics experience extends to being able to solder stuff...but
that's pretty much it.  I take stuff apart, sometimes it goes back

I noticed Electroluminescent  Vinyls paste out side the taxi door for
advertisment without any protection, I remenber this kind of displays
need high ac voltage to triger. I am wondering would this pose any
danger in electric shock when this vinyls gradually degrade over

This may be a stupid question, but I'm about to build a crystal radio
(http://www.bobsdata.com/crystal_radio/index.html) and I want to use a
little audio amp (Cat. KC5152 @ www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal

Hi, I'm reposting this here, my previous attempt was probably in an
inappropriate place.
I bought a variable voltage variable amp power supply to use
charging my RC batteries:

Left over from my boating days is a 300amp portable jump starter (www.
4earlybirds.com/jump charger.jpg) Both a laptop and small hp inkjet
printer are carried in my car along with two 75w DC/AC inverters that
plug into the cigarette lighter. The laptop is powered via  the car

hay watsup , i m in need of little help i have a project of solar
based lighting system , motin sensors are also incarporated, battery
will b charged by solar energy , if the battery is not charged
properly then it should b charged by the main power supply.first i

    --Curious to know if there are any know downsides to stuffing an
extra 12v battery in a car, hooking it in parallel with the existing one and
expecting the alternator to charge both of them. I expect it would take
twice as long to charge 'em both, but is there a danger of screwing ...

I just hooked up a Sharp GP2D12 IR range sensor to a scope and saw
that the output is very noisy. The sensor updates at 25Hz so I was
thinking that if I were to add some kind of 25Hz low pass filter to
the output that would clean things up.

I've been looking for a transistor regen schematic, finally found one,
but it doesn't give the coil specs.  I want to receive the AM band,
from 530 kHz-1500 kHz.  Any help on this very much appreciated.
http://www.techlib.com/electronics/regen.html

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Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
-rectifier 2x062h 8025:..open in both directions