This circuit uses a capacitor that depends on the frequency of the crystal. We found it in a 1967 documentation. The maximum frequency is around 100 kHz.
Suggested by Fairchild in a 1980s publication, this multiplier uses operational amplifiers from that...
We found this circuit in an English publication from 1980. It provides a logical output signal when...
This unusual amplifier configuration is from 1986. The circuit has a high resting current given the...