LM321 follower problem

mengyanfeng

LM321 follower problem [Copy link]

I have a question about analog electronics hardware and would like to ask the seniors in the group: the electromagnetic coil generates a sinusoidal signal with Vpp=1.6V and a frequency of about 1140HZ. It is estimated that the internal resistance is relatively large, so the AD correlation is input after using LM321 as a hardware follower. However, after connecting to the LM321 follower, it is found that the waveform is distorted. What may be the reason? The schematic diagram and waveform diagram are as follows:

呜呼哀哉

Your op amp is powered by a single power supply, and the signal appears negative. The internal clamp protection diode of input 1 pin works to protect it. Either raise the signal to full positive, or use positive and negative power supplies.

maychang

Where is the 1st pin of U4 connected to? Is it connected to the negative power supply or the ground? If it is connected to the ground, then it is not surprising that the negative half-cycle deformation occurs.

Shawn.TAO

The screenshot of the critical part of pin 2 of the op amp is not shown, but all the unimportant parts are shown.

mengyanfeng

Thank you all