Electronics Forum / Equipment / November 2004

What is the frequency (range) used in domestic microwave ovens?
Do all ovens use the same frequency?
Is this frequency related with the chemical properties of H2O?

Cross-posted to sci.electronics.components & sci.electronics.equipment
I am trying to identify a mini-cassette deck that is used as for data storage on
a Newing-Hall NC engraver. I have just acquired the engraver but one drive is
mechanically damaged, so I am trying to replace it.

For Auction (revised)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5734983245

I have a very large and complex rack-mounted box which contains a 14-slot
ISA bus passive backplane [physically divided into 2 separate PC segments]
and 12 cards of various sorts installed.  The box has physical room for
mounting 3 drives in the front opening in which I have a ...

I am hoping that someone here can help in finding a schematic diagram or
hook-up diagram for a Robertshaw Model SP715A Ignition Control for a gas
furnace.  It works in conjunction with a double solenoid gas valve.  I would
like to have a service manual that explains its operation ...

Hi - I have a Tek 2221 that could use a bit of a checkup and I'm in
Los Angeles. What would you recommend? Are there any particularly GOOD
technicians/services around?
thanks

Hello,
 I am working with a 4.3 and 3.6um LEDs but i'm running into a
problem, the detector is heating up. Is there a workable way to slow
down the pulse rate of the LED driver? If so will it lower the

I found this great little site. I signed up two weeks ago and got 2 Disney tickets and this week they are sending me 2 Universal Studios tickets. Here's the link http://66.219.102.40/ and by the way I am a real person, this is my real email address. I'm not a spammer and didn't ...

Can anyone recommend an inexpensive VOX telephone for home use for a
disabled person?

I'm looking for links to information on light emitting diodes that are
rated in the 3.6 - 4.3um infared spectrum. There seems to be very few
suppliers and poor specification sheets on the net, but if anyone
could help me on this one that would be great.  Thanks, Mitch.

I have recently purchased the Racal-Dana 1991 couter timer on ebay but
without any manual. Is there anyone who can help with an operating manual,
original, photocopy, pdf  etc. Although basic operations are self
explanetory there is a lot more functionality avilable in this device.

whenever we have the computer on, the tv has lines/snow on some of the
channels. will one of those powerboards with the inbuilt filter
solve this or is there something else that will do it.

I just picked up an old kenwood cs-5135, when displaying i got a ghosted
line, what is this from?
http://chrispol.ath.cx:8080/scope.jpg

Here is my set up,  I have 8 photodetectors, I assume they are in fact
photoresistors but am not sure. I have not been able to get a
resistance measurment when I put a multimeter across it, but I get a
voltage when I touch both probes to the hot wire.