We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the table shows the capacitor values according to the number of cylinders in the vehicle.
This circuit was found in a 1968s European documentation. It is a current regulator using...
This oscillator is indicated for the adjustment of FI of FM radios, having its frequency...
With a 1 500 uFcapacitor this timer can reach times up to one hour. The capacitor must be of good...