RF power meter (CB8977E)

This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The diodes support general purpose equivalents.

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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...