This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is based on the LM3909 integrated circuits.
This circuit couples 600-ohm signals to a line of the same impedance consisting of an amplifier stage....
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...
The power supply shown has protection against short circuits and can eventually be mounted with...