This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to produce a tone on a transducer when transmitting messages in SSB telegraphy.
This is one of many versions of this circuit that the reader can find in this section. The circuit...
The connection of high-value input resistors causes the circuit to behave like a conventional...
This circuit generates a 5V rectangular signal. The circuit is suitable for calibrating TTL...