The chip LM358 is a dual operational amplifier that can be self-checked using the following steps:
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1. First, insert the chip into the circuit board or socket.
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2. Open the multimeter, set it to voltage detection mode, and select the voltage between the positive terminal and the ground terminal on the circuit.
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3. Check whether the pin position of the LM358 chip is correct, and supply power to the chip within the normal operating voltage range, that is, input a voltage between 3V and 32V at the Vcc pin.
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4. Observe the reading of the measuring device to check whether the chip can output normal voltage. In general, if the chip is working properly, there will be a reasonable voltage difference between the voltage at the forward input and the voltage at the negative input, ranging from about 10mV to several V.
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5. In this test process, it is necessary to keep the polarity of the positive and negative input terminals under the normal working voltage of the chip consistent to avoid measurement errors.
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6. During the chip inspection process, if the multimeter reading changes greatly or is zero, the chip may be damaged.
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Please note the following safety issues:
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1. When conducting chip inspection, it is necessary to use appropriate tools and follow correct detection procedures and safe operating procedures to avoid electric shock or other hazards.
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2. When connecting the circuit, ensure that the power supply is turned off and the power supply voltage is within the rated range of the chip to prevent the chip from being damaged by too high power supply voltage.
A basic amplifier circuit and voltage comparison circuit can be built. Through the input signal, the output signal is measured comfortably by the instrument, and the correspondence between the signals meets the basic properties of the circuit.