This 100 kHz oscillator was found in a 1966 Motorola publication. The transistors are of types suitable for the generated frequency and L1 / C1 depend on that frequency.
This DC / DC converter was found in an American 1980s documentation. It provides a negative...
This tone control with high impedance input was found in the Linear 1994 Applications Handbook by...
The current drained by this circuit, from a 1976 documentation, is 3 mA and the cut-off frequency is...