Subject: Re: help! ultra compact, simple transmitter
Date: Wed, 16 Oct 2002 16:27:38 -0700
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Yes.... they can be made that small but I doubt the range would be much more
than a few feet, far less than the several hundred feet discussed by the
original poster..... and ..... if the capsule leaks you will then be exposed
to toxic substances such as lead, mercury, cadmium, etc..... then, what
about the receiver?
Anything with any range at all is going to have more than just a single AA
battery in it.
Frankly, the cheapest and easiest solution is the wireless doorbell that a
previous post mentioned...... usually $10 to $20 .... also a dirt cheap
pair of "Family Radio" units..... while they don't take a single AA cell
they do have considerable range... and occasionally they are seen on sale
for about $20 to $30 a PAIR ! Nothing to build, nothing to put together,
no parts to find....... all ready to go, tested an put together for less
that you could buy the parts for.
Electronics Supply & Repair
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"James Meyer" wrote in message
> On 16 Oct 2002 02:27:18 -0700, email@example.com (limahl) wroth:
> >How compact could that transmitter be made, and could it be powered by
> >a single "AAA" 1.2v
> >nicd battery?
> 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
> left over in the capsule for a pH sensor.