This circuit, which can act as a shield, was found in a 1990 PE Hobbyst Handbook. The circuit generates logic pulses for different types of applications.
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...