This transistorized circuit is powered by a voltage of 6 to 12 V providing high voltage for a neon lamp. The circuit is from a 90's publication. Modern equivalent transistors can be used.
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
In the figure we have the transmitter of a data transmission system with optical fiber suggested by...
Other operators of the same family can be used in this circuit suggested by Motorola in its 1990...