Placed near a common receiver, this oscillator is intended to generate a beating signal to receive RTTY or SSB communications. The circuit is from old telecommunications documentation.
This configuration was obtained in the SGS manual of linear integrated circuits of 1982. The...
This circuit works with only 1.5 V and can be powered by a solar panel. The circuit is from 1991....
This circuit was obtained in a 90s Popular Electronics. It is used for tuning on AM radios. The...