Motorcycle headlight monitor (CB9117E)

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

High impedance preamplifier (CB8941E)
Suitable for operation with high impedance microphones, this circuit was found in American...
High current neon regulator (CB8812E)
Found in a 1969’s documentation, this circuit can supply currents from 100 to 120 mA at loads of...
20 V Differential Amplifier (CB4493E)
The MC1436 can also be used on this circuit found in Motorola's 1993 Linear Interface ICs. The...