Voice controlled electric curtain machine circuit

Circuit working principle: The circuit is mainly
composed of microphone MIC, voice control trigger circuit IC2, motor drive circuit and DC reversible motor. Microphone MIC is
an acoustic-to-electrical conversion element, which converts acoustic signals into electrical signals to control
the output state of the IC2 trigger circuit. The trigger sensitivity can be selected from three options through the peripheral circuit of IC2. IC2
is a special voice control circuit . It has 14 pins and two packaging forms. aa is for
power supply decoupling. If no capacitor is added during use, aa should be connected together. The chip is internally
composed of amplification, delay, rectification, frequency selection, triggering and driving. The output has three
states: when a control signal is received, the output state changes once. Therefore, when the controlled
actuator is a motor, the motor status can be changed to forward rotation, stop, reverse
rotation, and stop in sequence.