This anti-ringing circuit was found in an English documentation from 1996. The integrated circuit is the 74LS14.
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
July 2017 - The new TC6321 integrated circuit consisting of a pair of transistor MOSFET...
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....