This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The phone is crystal. We found it in a 1968 American documentation.
This circuit was found in a 1998 documentation and its purpose is to automate controls by timing its...
This circuit is from a 1977 Radio Shack documentation. It produces a modulated sound of good...
This second-order filter was found in old American documentation and can be applied to other...