How to build a voltage follower for the LM324 quad op amp? Let's use a few simple examples and a voltage follower circuit diagram to explain.
Example 1:
The first is to short the two inputs of the LM324, and the output has about 1 mv.
However, there is a problem with this circuit, that is, there is a small amount of error between the follower voltage of the voltage follower and the input voltage, which is probably about 400mv larger than the input.
There is also a 5V power supply. When the output value of the output reaches 3.9v, the input terminal cannot be raised and the voltage output terminal will not rise any more.
Example two:
Let's start with a brief sketch of the LM324 voltage follower. The picture looks like this:
The above circuit diagram actually shows that the im324 voltage follower requires very professional electronic knowledge in the design of the circuit. In the following article, we can see that when the signal is within 10K (-3DB), the characteristic is OK, 10k Later, the op amp characteristics dropped dramatically. Causes waveform distortion. . . In addition, the slew rate of this op amp is 0.3V/us. When the input signal VPP is 10MS, the output is amplified 1000 times and its peak value is 5V. By SR = 2Ï€f * v. Can get f at around 10K. Once again, the above problems are explained, indicating that if the board of the voltage tests BG, then this is not as shown:
The voltage diagram of the lm324 voltage follower has a characteristic. The internal frequency compensation DC voltage gain is high (about 100dB). The power supply voltage range is wide: single power supply (3-32V) dual power supply (±1.5-±16V) OPA637, as for the parameters Do not say, look at the price to know the gap, the amplification circuit is very simple, and the effect is very good. . But today, I have used more than one dollar for the film to feel more problems.
Later, I asked a friend who made the lm324 voltage follower. He told me that the power supply should be installed and debugged first. If the signal is deformed, it will almost become a diagonal triangle when it is 50K. Then you should increase the amount of resistors and capacitors to fully form a positive voltage follower.
As for how to do the LM324 voltage follower, choose which one is more effective, and the problem solving method is simpler and easier, just look at your choice.
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