Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz. Modern equivalent transistors can be used.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
The circuit shown in the figure generates a square signal (50% active cycle) when the pressure switch...
We found this transistorized AM receiver of the regenerative type of excellent quality in a...