Found in documentation from the 1990s, it uses a sound effects integrated circuit, the SN7677 from Texas Instruments. Unusual component these days.
No information is given about the transformers in this circuit suggested by Motorola in a 1968...
This circuit was found in old English documentation. The coil must match the tuned range. The...
The circuit is from old documentation from the 70s, but the components are still common, as the...