New finds & the Woz!

From: Dwight Elvey <elvey_at_hal.com>
Date: Mon Oct 30 14:32:26 2000

"R. D. Davis" <rdd_at_smart.net> wrote:
>
> Didn't everyone build one of these, as well as AM and FM radio
> transmitters for their own radio station, as a kid? The circuitry for
> a TV jammer is very simple; just requires a few easily made inductors,
> an RF transistor, antenna, resistors, caps, variable cap and batteries
> (I used two 9V batteries in mine). The whole thing fit on a hand-made
> PCB that was about 2" by 2" or less.


Hi
 I saw an article that showed that one could put
two junction fets together in such a manner that
it made a negative resistance curve like a tunnel
diode. I did this and made a FM jammer. It used:
1 PFET
1 NFET
1 pot
1 coil
1 tuning cap
1 bypass cap
1 battery

I would think that a standard oscillator could be
done with less transistors but it would require more
total parts. I used to hate opera ( still do ). Most
of this was on FM. A few blanked out signals would eventually
cause the person listening to hunt for another channel.
FM goes completely quite when jammed, unlike AM that squeals.
Dwight
Received on Mon Oct 30 2000 - 14:32:26 GMT