The setting of this power supply is only 0.1%. We found it in a 1969 US documentation. Transistors may be current equivalents. Note the use of symmetrical power supply.
Found in a 90s Popular Electronics, this circuit is based on a common CMOS component. The circuit...
Taken from an Electronics Now from the 90s, this circuit generates signals whose frequency depends on...
This power supply uses a single-winding transformer. We found it in July 1984 Radio Electronics magazine....