From: Lizard Blizzard
Subject: Re: help! ultra compact, simple transmitter
Date: Mon, 21 Oct 2002 07:33:39 -0700
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Bill Jeffrey wrote:
> James Meyer wrote:
> How compact could that transmitter be made, and could it be powered by
>>a single "AAA" 1.2v
>> First, find a tunnel diode. They have been used to make transmitters
>>small enough to be put into capsules that can then be swallowed. There's room
>>left over in the capsule for a pH sensor.
> That is the right answer. The GE transistor manual (circa 1963-1965) had a
First off, tunnel diodes are impossible to find. A simple one
transistor oscillator that can transmit a hundred yards will fit on top
of a 9V battery snap-on connector, without an antenna.
> schematic for a tunnel-diode FM transmitter powered by a single AAA cell, for
> broadcasting audio
> in the commercial FM band. I built one into a lipstick case I got from one of the
> girls next door. From my fourth floor Boston apartment, it was clearly audible 500
> yards away on the other side of Kenmore Square, with a cheapie 6-transistor pocket
> radio. With some bandwidth reduction (you wanted only a signalling function,
> right?) and a better receiver, the range should be even greater.
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