We found this circuit in a Radio Electronics magazine from June 1992. The circuit has a power stage and is used with 4.5 MHz video TV signals.
The values of the capacitance between output A and ground can be programmed digitally in 18 steps...
This is one of many twin-T oscillator configurations that can be found in this section and on this...
This useful power supply was found in an 1985 Italian publication, but can still be assembled...