Solar Voltage Doubler (CB20482E)

This circuit is intended for carrying out experiments with solar cells. The circuit is from a 1991 documentation.

Higher Current Voltage Variator LM3900 (CB5058E)
The circuit of the figure serves the same purpose as the previous one (CB5057E), but has a...
Sound controlled robot (CB7090E)
This sonic control circuit for a small robot turtle was obtained in an American documentation from 1967....
1 600 meter Line Receiver (CB1554E )
In the figure we have a line receiver circuit (twisted pair) with the possibility of...