The green LED inside the control satellite doesn't just light up; it's part of a more intelligent circuit. You will notice two resistors connected to it: a 1.5kΩ resistor in series and a 10kΩ resistor in parallel. This configuration is not just for lighting the LED; it serves a dual purpose:
Place 100nF ceramic or polyester film capacitors in parallel with each rectifier diode. This dramatically suppresses high-frequency switching noise (diode hiss). 2. Elevate the Low-Pass Filter (LPF) Op-Amp creative a220 circuit diagram better