Found in American documentation from the 1980s, this circuit has a diode feedback. At the exit we have an indicator LED. The LM3900 is a transconductance operational amplifier.
We found this circuit in an American documentation from the 90s. The circuit applies to vehicles...
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...
This traditional LED sequencer circuit was found in the February 1992 Radio Electronics magazine. The...