Found in Ferranti's 1969 documentation, this circuit can be mounted with a modern equivalent transistor. The circuit has a 4 V immunity and can be used as a shield for sensors.
This circuit triggers the LED when the monitored battery voltage drops below 9 V for 12 V...
Found in a Linear Technology 80s integrated circuit manual this circuit has its gain controlled from...
This very low consumption circuit can be powered by a solar cell. The time indication is given by a...