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.
Despite being a circuit found in an Argentine publication, it seems to us that the original is...
This simple transistor amplifier is from 1982 documentation. The output transistor must be mounted on...
This Cross Fader as it is also known causes the brightness of one lamp to increase while the...