Absolute Value Amplifier (CB8997E)

This circuit, published in the 1980s, can be applied to operational amplifiers of almost any type. The power supply must be symmetrical.

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27 MHz Converter (CB16876E)
With this circuit it is possible to receive the signals from the 11-meter band (27 MHz) in a...
Automatic Crossing Light (CB14947E)
When a model train crosses a level crossing, interrupting the light on the sensor, this circuit...
Operational Fast Wave Rectifier (CB14421E)
The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be...