Electronics Forum / Electronics / June 2004

I have a MB90F347 microcontroller from Fujitsu and am trying to
communicate over UART. Everything works fine, if I transmit only
values from 1 to 255. But I'm not able to send a 0 (0x00).
I really don't understand why this doesn't work. Also in the hardware

I am trying to locate or help with a circuit that will monitor the current
on a mains cable and sound a short alarm should the current change. The
basic idea is for remote monitoring of a set of PIR controlled security
lights up to 10 seperate units at 500W each. I don't want to run ...

I have a problem and don't know where to look for a solution. We just had a
very humungous lightning storm here in Ontario Canada. It wiped out a large
computer driven XY plotting router. This is the main machine in a small sign
manufacturing company. This machine is quite old ( 10 ...

Hi, I am a student at the Design Academy in Eindhoven, the Netherlands. I'm
working on a project about light and survival. I read about the possibility
to get electricity from a lemon or potato. I want to make a lamp that you
can 'plug' into a lemon or potato. The light has to be ...

I need a design or some design help to build a circuit for security systems
fault finding.
First a little explanation:
A number (up to 6) of PIR (passive infrared) sensor are wired in series and

A warning to people who like me are attracted by LG's electronics
products and pretty aggressive prices. Everything is fine if the
product works, HOWEVER, be warned that should the product fail, you
may have significant problems getting it satisfactorily repaired.

I am trying locate a prescaler to use in an old EA frequency counter either
a Philips SAB6456 or a Telefunken U664B . Any help appreciated

I have a 7.2V Johnson Electric DC motor. I'm trying to incorporate it
into a mobile platform I'm building. The only trouble is that I was
planning on using a power supply which supplies 12V and 5V.
This has led me to a few problems which I can't resolve:

Yaesu FRG7 communications receiver for sale
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=5704510931

can anyone tell me what chip i would use
i have several switches and want a chip that would go between them  i ,e one
switch press once for relay one , press twice for relay 2 press three times
for relay 4 etc

Does anybody know if the stick-on copper tracks are still available? Been
ages since I saw them, can't find any reference recently. But then times
have changed I guess.
Thasnk,

Im working on a burning man project, and need to build or find an 8
way switch that can distribute a single input, at speaker power level,
to 8 different speaker outputs, one at a time in sequence with a user
adjustable speed (~0 - 1200 Hz?).

A friend has a pioneer PDP-501MX plasma tv which now does not work.
Apparently there is a problem with the panel itself-most likely with
the electodes located on the front side of the glass. Pioneer says the
Plasma panel will have to be replaced. The plasma panel is number

I've found a diode that suits an application and it was removed from
a board some time back but don't now which one I'm afraid.
It's a large power build and marked :
31DF

i agree!
lets let electrionics go as plannd.
i now have a circuit for the amp
i drew it myself seing its no longer