This circuit generates pulses whose frequency depends on C1. The circuit can be powered by voltages from 5 to 15 V. We find this configuration in a Signetics manual.
MCP19124/5 Contains Independent Voltage and Current Control Loops Plus a Full Suite of...
This circuit is from an old documentation from the 70s, so the transistors used are not common....
This small transmitter can act as a wireless microphone operating in the medium wave range,...