Found in an 90s Electronic Design, this circuit provides a 110 dB output to a ceramic transducer. The transducer is of the type available at the time.
This double-beat oscillator was found in American documentation from the 1970s. FETs admit...
This circuit applies to an old dial phone by detecting light pulses in the dial. The circuit is...
This circuit is from 1970 documentation. The SCRs are types of the era that can be replaced with 106...