Solar timer (CB20498E)

This very low consumption circuit can be powered by a solar cell. The time indication is given by a microammeter.

High Impedance Millivoltmeter (CB19738E)
We found this circuit in an old European documentation. The operational amplifier that is not...
1 to 10 mA Constant Current Sourcer (CB1200E)
This circuit can provide constant currents adjustable between 1 and 10 mA. The transistors can be...
480 kHz Low Pass Filter (CB13564E)
We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass...