High current buffer (CB7280E)

Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a few megahertz.

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...