Bike speedometer (CB20497E)

This circuit can be powered by a solar cell. The circuit is from a 1991 documentation having a phototransistor as sensor.

Dimmer (CB16627E)
This traditional triac dimmer configuration was obtained in a 1987 documentation. The circuit can...
Band Pass Filter (CB19687E)
This bandpass filter has a simple feedback system. The component values can be calculated using the...
Function Generator 709 (CB20140E)
The 709 integrated circuit is not common today. The circuit is from American technical...