Photometer (CB7360E)

This 1964 Electronic Design circuit uses a photo-FET as a sensor. The component is rare today.

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Logarithmic Amplifier (CB15910E)
This circuit is suggested by Motorola and has logarithmic response characteristics. For signals of low...
3 V power supply (CB17037E)
This unit is intended to power 2 AA or AAA battery powered applications from the car battery,...
Volume Compressor (CB19808E)
This volume compressor uses unusual components today. The circuit was found in documentation from...