Electronics Forum / Basics / February 2008

I just  bought a new strobe light for an experiment in biofeedback;
supposedly it can flash up to 10 fps but  I need to know when or if
it's flashing at pretty much 7 fps. Does anyone know if there is any
quick and dirty way to determine the flash rate?

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 and 2nd output
Vo2.  Here's a simple table of the relation I want from Vi to Vo1 and
Vo2

Any PIC users in Palmerston North or Ashhurst New Zealand ?  Need help
on a very small project.
Thks
Charlie

Could someone please describe to me the calculation behind FM
deviation measurement using an oscilloscope?
I've made the measurement thousands of times, but I've just followed
the manual.  The measurement I make is 30Hz FM with 480Hz deviation on

I have this circuit that I am trying to make and it calls for a 47uf
and a 68uf electrolytic capacitor. Now unfortunately, in the smallish
town I live in the only store to buy components is what used to be
Radio Shack. There they only sell 100uf and 220uf and 470uf

can anyone please point me to a circuit that I can use to stretch the
on time of an LED when the on pulse is small? I have a push botton
that I want to press momentarily and see a longer (say 1 second)
illumination of the LED.

Will clicking my heels bring my audio back? Tried everything else.Blu-
Ray picture works through it
just fine but, no audio.Help
        Thanks,Ed

is there a lead/connector that connects the headphone outlet of a
device to the mic port of another device. I am wondering if I can
record radio programs from a radio into the voice-recorder having a
mic input port. Dos any one know of such a thing and what is it

I have a sony cybershot photo camera that came with 2100mAh
rechargeable sony AA batteries and their charger.
Now the batteries died (after quite some use).
Can I use the new sony 2500mAh or 2700mAh batteries with this same

I am looking at a number of FM transmitter circuits, purely as a
project, but all of them use electret microphones as input.  Would it
be possible to replace this with an audio input for my iPod?

As the final project in my school, I'm building a real-time logic
simulator called Atanua. It's available from:
http://iki.fi/sol/atanua.html
Although it's a pure ideal-component logic simulator (not SPICE), it's

I'd like to measure how much current various plugged-in devices draw
when they are "off".  I have a digital multimeter that will measure
AC voltage.  So I thought maybe I could place a small-value resistor
in series in one of the AC lines, and measure the voltage drop

I am facing some issues regarding a stepper motor drive. The stepper
motor I have is a 20KG 12V DC L/R Full step driven one. I need it to
drive a Lead screw which eventually builds up pressures of the likes
of 400Kg cm in a cylinder.

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 ordinary   bridge rectifier for a
heavy duty 12-15 vdc power supply...
What do i do with the gate, and the other wire sticking out of the scr ?

I want to shield electronics in a plastic box from RF.  My first thought
was to get some copper foil tape with conductive adhesive and use that
to line the inside of the box.  Then I priced the copper foil tape with
conductive adhesive, not cheap.  I was wondering how much, if ...