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.
Found in documentation from the 1980s, this circuit makes use of discrete components of the time....
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...
This project makes use of a technology without many digital components and that can be easily...