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.
The idea of this automation can be extended to other applications that involve the control of...
This sophisticated transmitter was found in the June 1993 issue of Electronics Now magazine. The...
March 2017 - Texas Instruments LM5166 Synchronized Buck Converters are available at Mouser for 3V...