This circuit from Motorola is from 1968, appearing elsewhere on this site. The transistors admit equivalent and the relay is of the sensitive type for low voltage, according to the power supply.
In the figure we have the simple way to use a low current switch or sensor to drive a high power...
This circuit is from a 1992 PE Hobbyst Handbook. The circuit fires an old electronic flash using an...
This new Texas Instruments component consists of an inductive proximity detector that can be used...