Obtained in MIT documentation, this 4-stage circuit has high gain for small signals. The power supply sources 150 V.
Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The...
This circuit was obtained in a Radio Shack documentation from 1977. It consists of a didactic...
This circuit was found in the May 1990 Radio Electronics magazine. The timings depend on the...