Motorcycle headlight monitor (CB9117E)

This simple circuit was found in Popular Electronics from the 1980s. The circuit uses an LED as an indicator.

Comparators for opposite polarities (CB9590E)
This circuit was found in a 1980s documentation, using a comparator from the time. The...
Common Mode High Reject Video Amplifier (CB9419E)
Found in a 90's EDN, this circuit has a 45 dB common mode rejection. The pass band is 60 MHz. The...
50 mA composite operational amplifier (CB25184E)
This complementary circuit increases the output power of an operational amplifier. Outputs with...