Morse Sounder
A simple morse sounder build with a LM386.
Connect to a serial port. Asserting RTS more or less connects pin 1 of
the LM386 through the 3K3 resistor to ground. This increases the gain of
the LM386 to a value above 29. A loop gain above 29 starts the phase
shift oscillator. This is based on a trick
described by JF1OZL.
The frequency is around 700Hz. Change the phase-shift network for an other
frequency.
If you want to use the sounder without a PC connect RTS to CTS.
Archive containing the Xcircuit file
(encapsulated postscript).
TODO: add an archive with software (MS-DOS based).
