Operating in class AB1, this high-fidelity amplifier was found in the 1961 RCA tube manual. The circuit has high input impedance and good gain.
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
This circuit was found in an old European documentation. When R2 is cut off the circuit triggers...
This circuit for the positive front of a rectangular signal was found in an old documentation, but applies...