Electronics Forum / Electronics / April 2005

I built a "home alarm system" published in Elektor electronics magazine,
january '99 for my school asignment. The problem is that I don't have the
code for the processor. So if anyone knows where I could get it or maybe has
it and would like to share it, I would be very gracefull ...

I would like to know if anyone has come across a miniature motion detector
of some sort that is small and can be easily hidden.  Up to 3 metres in
range is fine, and I'm not too concerned about angle and it doesn't need to
be body heat activated.  It won't be hooked up to an ...

Digitor tv model G-7200 pcb 031B
The tv does not start; there is 10.47 volt on the collector of the HOT
(BU407)whch is straight from the FBT and there isn't any volts on the
base.

i have a problem with my monitor. NTC Model #: KY-718. It has excessive
width and 1 side pincushioning problem. I cannot find a schematic on
this monitor. So i cannot able to locate the pincushion circuit. but i
check many parts in the horiz area but it seems that everything i

Maybe someone can help me.
Looking for the name of this cable or the type of cable. Did a search
on "ribbon cables" and only get computer type cables for hard drives
and such.

At the Computer History Museum (www.computerhistory.org), we're restoring
a DEC PDP-1 computer (www.pdp-1.org).  In the process, we need to repair
a flaky amplifier channel in a Digitronics 3500 paper tape reader.  We
isolated the fault to one channel.  Each read amp board has three

can anyone provide a pointer(s) for electronic display of a single
aphabetical character?
the only thing i've come up with so far is a matrix of LEDs with a micro
driving it (probably with a walking 1 scanning arrangement)

As stated the model in question is LG GDR 8163B
I did download the firmware from here and it works
a treat but I am wondering if there is a hacked version
available.

I am planing on putting a antenna & transmitter in a 80ft silo that is
concrete & meat without any power.  I need to get power to the transmitter,
it would be to far to run a power coard that is out.  The idea I had was use
two solar panels or wind power.  What do guy think I should ...

I need to power a water valve actuator with 24AC 650 mA. I cannot
easily find a 650mA 24VAC supply, but 1amp or 2amp or so I can find.
Will the actuator adjust to the amperage it needs? Should I step down
the amperage to 650mA using some sort of current limiting device?

I would like to build a device to connect a CCTV Camera to a TV using an old
VCR Modulator, does anyone one have a svhematic of this - I remember seeing
a circuit a few years back but can't find one now.
Cheers.

Is there any practical use for old IDE hard drives, 50-200MB in
working order. Or are they only fit for trashing? Any ideas?

I have a compact FM transmitter that runs on three AA batteries.  I'd
like to get  an AC adapter for it but am not sure what specs are
necessary.
At first I was thinking that a 4.5 v AC adapter at around 300 mA,