A two-stage design is used to improve the accuracy of phase shift. The numerical control phase shift part is mainly based on the MCP41010 numerical control potentiometer, which can be externally connected to an MCU for program control. For details, please refer to the MCP41010 data sheet. 0-300° phase shift can be achieved within the range of 10k-100kHz, and the power supply range ±5V~±9V, ±7V power supply is recommended (AMS1117-5.0 requires a voltage difference of 0.7V to provide a stable 5V voltage). If you need to work at other frequencies, you can modify C3 and C8 as coupling capacitors and phase shift capacitors. C4 and C7 (Generally speaking, the coupling capacitor is 10 times the phase shift capacitor. The principle is to use large capacitors for low frequencies and small capacitors for high frequencies. The recommended coupling capacitor range is 1u~10u)
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