In fact, this 1967 Electronic Design circuit generates two symmetrical ramps whose frequency depends on the values of the components used. Modern equivalent transistors can be used.
This 1 A power supply was found in an Electronics Now from the 90's. The integrated circuits must...
Found in a 90s EDN, this circuit is indicated for power control through a 4-20 mA line. The...
Found in a 1967 American publication, this circuit with feedback for two transistors has a gain of...