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DC-DC step-up part of the circuit RU190N08 Power circuit board SPWM drive plate TDS2285 IC

This is a simple Triangle-to-sine converters circuit diagram , this circuit conversion of triangle wave shapes to sinusoid is usually accomplished by diode-resistor shaping networks, which accurately reconstruct the sine wave segment by segment. Two simpler and less costly methods may be used to shape the triangle waveform of the 566 into a sinusoid with less than 2% distortion. The non-linear IDSVDS transfer characteristic of a P-channel junction FET is used to shape the triangle waveform. Simple Triangle to Sine Converters Circuit Diagram  Simple Triangle to Sine Converters Circuit Diagram The amplitude of the triangle waveform is critical and must be carefully adjusted to achieve a low distortion sinusoidal output. Naturally, where additional waveform accuracy is needed, the diode-resistor shaping scheme can be applied to the 566 with excellent results since it has very good output amplitude stability when operated from a regulated supply.