Found in a 90s Electronic Design, this circuit can be used as a shield in current projects. The circuit provides three levels of signals for triggering loads.
This experimental amplifier was found in the 1960 Mullard transistor reference manual. The...
This circuit from Motorola is from 1968, appearing elsewhere on this site. The transistors admit...
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...