Bike speedometer (CB20497E)

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

Blue Lamp (CB16849E)
This simple inverter was found in a 1997 documentation. Its purpose is to apply a high voltage to a...
Polarity Reverse Protection (CB15055E)
For this circuit, the polarity of the power input does not matter, as the output terminals will...
PUT SCR control (CB13906E)
In the figure we have the way to control an SCR with a programmable unijunction transistor (PUT)....