Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The circuit is for 150-ohm transmission lines.
This oscillator was found in a 1976 documentation. The no specified components indicate circuit...
This circuit activates a buzzer when the voltage applied to the input falls below a preset value in...
This protector was found in an Electronics Now from the 90s. The 250 V transient suppressors are common...