Electronics Forum / Electronics / April 2004

Does anyone know if there are units you can buy that will allow you to
control the power and volume of a very old tv?
I remember old cable boxes could do this but have never seen a stand
alone product that could.

Testing Something

Can I convert a 80w non active sub woofer into a active sub woofer? Is
there a kit or unit I could buy?

I just bought an DVD player and the power switch has a light which always seems
to be on.  Is this a new style or is there something wrong with the device?
It's an Advent DVD2200.
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I've got a Canon D660U flat bed scanner. The cold cathode light has
dimmed and the scanner is reporting an error along the lines of
needing more warm up time. Tried another PC - same problem. DC supply
to scanner from wall is OK when plugged in.

What would be the cost effective but accurate way of reading flight height
(altitude) of  model aircraft and how this reading would relate the local
QNH

I have a Panasonic microwave, model NN-5454B (white one that says
"Welcome to word prompting" when you turn it on. Yesterday all the
buttons except "stop/reset" and "start" stopped working. Tried
resetting the power - still no luck. Can't make it cook, obviously,

I have a hot tub control that switches the heater element on and off to set
the water temperature.
The thermostat has 20 amp contacts, that tend to burn out.  I replaced the
thermostat , then installed a slave mercury relay (contact rating 25A at 240

In the market for one now.
Nothing huge. Around the $2k-$4k mark.
thanks
Troy

I'm looking for a "Caller ID Box" to put in the phone line going to our
office fax machine, which will not pass incoming calls through to the
machine unless they have a caller ID.
I'm trying to limit the number of "junk faxes" which we receive every

I am using a 9V battery to power 6 LM324s (Quad Op-Amps), which
requires a ground connection, not a -VCC. When I tested the circuit
using an electronics kit to provide the voltage, it works fine, but
when I replace the electronics kit voltage with the positive and

Before I start, I have tried a Google search, and no luck.
I have a digital, hand-held tachometer for checking the r.p.m.s of
"stuff". I can read the display, but certain bars of the display are
very faint and I must play with the angle to see the numbers.

Geezus Phil Allison, I was expecting this to be a little harder. But it
seems that you've already pissed a few people off, huh?
Well, I'm gonna enjoy this.......
And I suspect there will be a few people who will not cry over your torture.

Our British treadmill is a juicy 5' from our (U.S.) 220V dryer outlet,
and since that treadmill has now blown the third fuse (in as many
weeks) on our specially-bought transformer (though I reckon the fault
lies more with house voltage spikes), I am wondering....

I am respectfully submitting this information to all Radio and
Electronic enthusiasts, collectors, clock makers, tinkerers and
dealers in this newsgroup. This may be of interest to anyone looking
to obtain Old, B-7971 Burroughs Nixie Tubes.