Broadband amplifier (CB9179E)

Found in an old Popular Electronics, this circuit has a gain of 20 dB. The integrated circuit is uncommon today.

Simple ohmmeter (CB23622E)
Combined with the two previous circuits, we can create a simple multimeter with this circuit. The...
Amplifier for instrument (CB21328E)
This 1.5V instrumentation amplifier was found in National Semiconductor documentation from the...
Bulb Saver (CB16631E)
This simple circuit helps to save incandescent lamps by leaving their filament slightly heated and thus...