This circuit is the receiver for the previous transmitter modulated by an audio signal. The transducer is a ceramic capsule, in which case the circuit becomes ideal for telegraphic transmissions.
An oscillator that uses two gates is not suitable for critical applications, as it tends to pick...
This circuit using the newly released HA2400 was found in the March 1980 Radio Electronics...
This configuration is from the 70s, having been found in an American documentation. The...