Single pulse generator (CB9075E)

The components of this circuit are still common today. The circuit is from a 1967 publication by General Electric.

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Voltage indicator (CIR22153E)
This circuit indicates whether the voltage to be measured is higher or lower than the zener diode...
Dual indicator (CB22136E)
Obtained from an English publication, this circuit actually needs a current limiting resistor,...
Constant Current Source (CB13073E)
Constant current sources are used in applications such as battery chargers, electrolytic tanks, etc....