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.
This timebase was found in a European 1980s documentation. The circuit uses well-known components...
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
This circuit generates low-frequency sinusoidal signals. The variable capacitor is dual and the...