Sawtooth generator (CB21338E)

This op amp circuit is based on a 555 IC and two common op amps. Transistors are general purpose.

9 V source from 3 V (CB20464E)
We found this circuit in recent English documentation. It can provide an output current between 9 and...
Solar cell bank (CB20480E)
In the figure we have the way to connect 6 solar cells in order to obtain higher voltage and...
Electronic voltmeter (CB23755E)
This circuit was found in Radio Electronics magazine from August 1966. The transistors are from...