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4558 is a low-noise dual operational amplifier integrated circuit, which is most suitable for active filters, compensation amplifiers, audio preamplifiers, equalizer amplifiers, and amplifiers for various circuits in electronic instruments and meters.
1: AMP OUT1 amplified signal output (1)
2: IN1- reverse signal input (1)
3: IN1+ non-phase signal input (1)
4: GND ground
5: IN2+ non-phase signal input (2)
6: IN2-Inverted lotus root climbing? 2)
7: AMP OUT2 amplified signal output (2)
8: Vcc power supply
The rated voltage is 9v
The voltage varies according to its application circuit. It is usually powered by a dual power supply to the ground, and sometimes it can be powered by a single power supply.
is used in audio circuits, sometimes it is used for multiple amplification, sometimes it is connected as a follower without multiple amplification, sometimes it is in-phase amplification, and sometimes it is inverted amplification. Pin 8 is positive, pin 4 is negative, pin 1 and pin 7 output zero volts, pin 3 and pin 5 are in-phase input, pin 2 and pin 6 are inverting input, which are usually lower than half of the supply voltage depending on the circuit design.
How to measure the quality of the JRC4558D op amp used on the power amplifier? Follow below to find out:
Generally speaking, when the op amp is working in a dual power supply circuit, the resistance of the V+V- power supply terminal to ground cannot be zero, and the resistance of other pins that are not directly grounded cannot be zero (refer to the circuit diagram); pin 8 is a positive power supply, Pin 4 is a negative power supply, and the voltage to ground should be ±12V.
In addition, if it is a multi-channel microphone input, it can be inspected in a targeted manner. You can use the induction signal injection method to check whether the circuit is damaged. If the speaker has a loud hum when touching pins 3 and 5 with a screwdriver, the op amp is good. Otherwise, it may be damaged; when there is no signal, the voltage of pins 1 and 7 to ground should be 0V. If the deviation is large, it can be judged that the op amp is damaged.
The dual operational amplifier is the integration of two general operational amplifiers on a single chip. It has the characteristics of high gain, high common mode rejection ratio, wide common mode range, simple compensation, stable operation, and good temperature stability between the two operational amplifiers.
The two ops are placed in their respective input, output, power supply and correction capacitor terminals, which is easy to use. It can be widely used in a variety of analog arithmetic units, active filters, waveform generators, data amplifiers and other occasions where a large number of operational amplifiers are used.
1. High common mode rejection ratio, wide common mode input range
2. Simple compensation and stable work
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