1 pin positive phase audio signal input, 2 pin negative feedback signal input, 3 pin negative power supply, 4 pin power output connected to the load horn, 5 pin positive power supply, which can be replaced by sk3875, LM1875, and other chips.
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The peripheral components are the same.
2,5 feet for the coil, 1,6 feet for the coil, the general 3 feet for the normally closed end, 4 feet for the normal beginning.
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2, pin 5 is equivalent to access control voltage, such as the control voltage given by the control circuit.
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1, 6 feet to the line from the positive pole, 3, 4 feet to the line to go to the positive pole. That is, foot 1 and foot 3 form a loop, and foot 6 and foot 4 form a loop.
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When the 2, 5 pin has the control voltage, the coil is energized, so that the contact is drawn, that is, the contact plate is moved to the 3 pin, forming the circuit of the 3 and 1 pin.
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When the control voltage of 2 and 5 pins is disconnected, the coil is powered off, so that the contact is disconnected and in a normally open state, that is, the contact plate is moved to 4 pins, forming a circuit of 6 and 4 pins.