This circuit is from a factory manual from the 80s. The circuit can be implemented with more modern operationals. Capacitor C1 is a low leakage type. The power supply must be symmetrical.
This transmitter operates in the FM band emitting beeps that can be picked up on a common radio at...
This configuration can be found in other articles on this site. This was obtained in 1998...
This circuit is from a documentation from the 70s. Thus, the original transistor no longer exists,...