Electronics Forum / Electronics / June 2004

Hello, my name is John.  I am a patent attorney licensed in two states
and before the USPTO.  Before starting my own practice, I was an
attorney at patent law firms in Chicago for 6 years.  I specialize in
electrical and mechanical subject matter.  My home is my office, so I

I would like to build one of these so i can plug it into my computer and
then tune a radio in the next room in to listen to stuff off my computer...
Dose any one know of any pre disended circuit available on the web to do
this??  IE ones i can just look and and build the PBC etc.. ...

I am trying to develop an intercom that sends out audio signals of 4Kz
bandwidth (three different channels through the same cable/wire.
(Prior to making that, I am actually trying to simulate that on a
computer so as to reduce the cost).  I have double side band

On the TDA2030 (or any amplifier) Can I just simply swap the inverting and
non-inverting inputs invert (or non invert) A audio single ? Sounds a bit
too simple, though a guy I know isnt sure if its that simple or not, I will
try it tomorrow though assuming its not going to work how ...

I've tried a few common places for them, though £30 for one is a bit much
(and worth more than the monitor) Does anyone know of any reasonable places
in the UK which sells them or referbs ?
Thanks

Greetings group.
Philips VR356/75 vcr.
I found a loose spring about 1cm long.
The vcr loads the cassette, and the guide posts

   Im looking for some help regarding an electronic drinking game ive got
called shock roulette, where you put your fingers in a compartment and the
game countsdown and shocks someone at random, now the problem is its only a
mild shock (runs off 1 aa battery), now how can I up the ...

I have been asked to do a 400 trip in a cessna aircraft TOMORROW
and to film the trip using my sony camcorder
on previous occassions the built in microphones captures way too much
ambient noise and next to nothing of the intercom and tower

I purchased a radio transmitter controlled dog door not long ago.
http://hitecpet.com/autpetdoorfo.html
Problem is, I occasionally forget to take the collar off when I take the
dog to a park where he goes in the water.  I've now gone through three

Electronic electricity repository is an energy concept that aims to accumulate
and store electrical energy from any source.  The storage would be intended to
accommodate such things as electric vehicles, home heating, etc.  The best
example is the EV - an electric car that would run ...

My apologies if this isn't the proper sci.electronics group for this
question --
I have an old one-piece stereo, the kind that's designed to look like a
rack system but isn't.  It has just one set of RCA inputs, which are

I have a microcontroller board that has a variable analog voltage
output via a DAC.  I want to use this variable voltage to control a
potentiometer on another board.  Is there any device that allows me to
run the analog voltage output through two pins and get a variable

Can anybody help me design a circuit that will digitize voice and
place the data into RAM, then read it and convert it back? The chips
from ISD won't work for my situation because there is no access to the
data. I want to be able to read the data in reverse to play the audio

I have a Technics SL-dv250 cd\dvd player which now fails to recognise the
inserted disc, you can hear it trying to read the disc, then you just get
the no disc message, any help would be appreciated.

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