Press the switch on the right
Discrete Wien Bridge Oscillator with Automatic gain control realised by the MOS transistor in the negative feedback chain and the RC filter in the gate chain of the MOS. Finally but not least in importance the diode. The advantage of this method is that it brings you as close as possible to a incandescent bulb stabilisation, because the time constant of regulation is much lower than the frequency of oscillation. The implication of this is that, with fritter diodes stabilisation, they try to compensate at every single cycle, thus imposing non-linear distortion upon every cycle. The MOS method imposes compensation at every few cycles (depending on the time constant)
