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.
This circuit is from Dutch documentation from 1967. The circuit works with a component of the...
We show an oscillator that produces rectangular TTL signals based on inverters. Inverters can also be...
This circuit of an Electronics Now from the 90's produces an intelligent direction signal that has...