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Telephone FM Transmitter -
Assembled
This low cost FM transmitter is
connected in series with your telephone line using the included modular
telephone cables. It transmits the telephone conversation over the FM band
when you pick up the telephone handset and the transmitted signal can be
tuned by any FM receiver. The circuit includes an "On Air" LED indicator
and also provides a switch which can be used to turn off the transmitter.
A unique feature of the circuit is that no battery is needed to operate
the circuit since power is taken from the telephone line. The transmitter
uses only a short aerial (about 4" x 10 cm long) since some of the RF
signal is also radiated through the telephone line itself. The
circuit might be used to share or record conversations, but not intended
for illegal use.
Specifications:
Supply voltage: powered by the
telephone line
Transmission range: 100m
(unobstructed)
Frequency adjustable: 88 to 92MHz
Includes all cables and connectors
PC board dimensions: 1.88" x 1.08"
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