Solar intercom (CB20503E)

This circuit can be used in demonstrations or science fairs. The circuit uses headphones and can be powered by solar cells.

Sine Oscillator (NI002E)
This Phase-Shift Oscillator produces sine low frequency signals suitable for many applications. It...
3 to 35 V with 4 A power supply (CB4332E)
We found this source with the CI 723, common at the time, in a 1989 paper. Power transistors must be...
Touch Action Switch (II) (CB146)
The very high-input impedance of the CMOS gate allows this kind of device to be used as a...