description:
The LM389 is an integrated circuit with multiple amplifiers that can be assembled into a multi-stage amplifier circuit, so it is called a multi-stage amplifier integrated circuit. Because it has multiple independent amplifiers inside, the application is very flexible and has been widely used.
Here is an electric blanket disconnection detector made by applying LM389 multi-stage amplifier integrated circuit, which is very practical.
Circuit composition
The electric blanket disconnection detector circuit made by the LM389 multi-stage amplifier integrated circuit is shown in the figure, and is mainly composed of a low frequency signal input circuit, a signal amplifying circuit and a signal output circuit.
The low frequency signal input circuit is composed of a magnetic head L and a coupling capacitor.
The signal amplifying circuit is mainly composed of LM389 multi-stage amplifier integrated circuit, resistors R1 and R2, engaging capacitors C4 and C5, and adjustable potentiometers RP1 and RP2.
The signal output circuit is composed of a coupling capacitor C2 and a speaker B.
The above is the description of the circuit diagram, the detailed analysis and circuit production process can be found in the PDF document!
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