Electronics Forum / Basics / July 2008

BrainStimPro Binaural Brainwave Generator is a Professional Medical
Brainwave Tuning tool for medical personal. With adjustable freq, base
frequency, modulation, duration, 8 programmable mask/background noises
(White, Pink, Surf, Rain, etc) 16 programmable color strobe sets

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I'm sure you’ve read these letters asking you to send $1 to 6
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risky, but through paypal all you have to provide is your email

Would this work where the source is of lower impedance than what the pbx
expects?
Thanks.

I'm in the UK on nominal 240V mains - actually about 245V
I've got some computers run from 12V switch mode power supplies (look
like laptop power supplies but slightly higher current rating than my
laptop at least). Today I was doing some fiddling which involved

I am trying to do a simple experiment involving an ocilliscope and a
function generator in the same circuit.  My plane is to have the
function generator set to produce a 10V (no load) sine wave an vary
the freq from 100-2700 Hz.

in the post ubove me
"look here" from moemobb00@yahoo.com
is this a scam?

I'm trying to make a battery-operated, microcontroller-controlled,
short-range, laser range-finder.  It needs to be very light (weight-wise).
Does anyone know of a reliable method of detecting reflected green laser
light from about 50 feet from a grassy surface in an outdoor ...

I'm using an LM358A for high-side current sensing. I would like to be
able to use the other OP in the so-8 package as a thermal shutdown.
This means that both outputs would be connected to the same point R9&
R8 junction on the schematic. Q1 &Q2 are really a dual prebiased

I recall from my hobbyist days that high-voltage capacitors can keep
a
charge for a significant amount of time, especially if they are cut-
off from the circuit subsequent to charging.

Please have a look at the circuit at:
http://www.glacialwanderer.com/_blog/blog2008/04_April/hb_relay5.jpg.
It is from the article at http://www.glacialwanderer.com/hobbyrobotics/?p=9.
The circuit it to turn on or off a AC bulb by a microcontroller. My

Hi, I've been trying to calculate "standard" values that would make me
a 555 R1/R2/C1 square wave oscillator with a 50% duty cycle operating
at close to 30Hz.
Can someone assist? My numbers come out with "odd" component values.

I need a new soldering station to replace one I lost during a move.
This is for hobby use in microcontrollers and general analog/digital
work.
Is a Metcal MX-500 a reasonable choice for these applications? I know

I've been reading a little about synchronous rectifiers as used in a
switching power supply.  I've also seen some references to a
"self-energized" version of the synchronous rectifier which could be used in
small signal rectification applications.

hi all, perhaps slightly off-topic but you guys have been of great
help to me in the past
When I was installing a new hifi amplifier last night, I realised i
was being lightly shocked each time i touched the amplifier case while

How does this IRF530-based circuit compare with, say, an LM3886?
http://www.irf.com/technical-info/appnotes/an-948.pdf
I thought this would make a good first project, but if it doesn't
sound so great, then why bother...?