Obtained in MIT documentation, this 4-stage circuit has high gain for small signals. The power supply sources 150 V.
Found in a 1967 EEE, this circuit generates a constant amplitude signal, stabilized by a zener...
This flasher was found in the September 1984 Radio Electronics magazine. The frequency is given by...
This small source was found in an English documentation from 1970. The diodes can be 1N4002 for...