Half Wave Fast Rectifier (CB5160E)

This 80's circuit can be made with current comparators. Rectification accuracy is 1% DC up to 100 kHz.

CW oscillator (CB20530E)
This Hartley telegraphy oscillator operates with the transmitter signal generating a tone in a...
Continuity Test (CB5935E)
This circuit appears elsewhere on this site, but from different sources. Using the LM3900, we find this...
Transducer bridge amplifier (CB4935E)
This circuit was found in a 1980s instrumentation publication and can be applied to virtually any...