The integrated circuit used in this application is uncommon, but equivalent operational ones can be used. The circuit is from the Signetics integrated circuits manual from 1972.
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...