/diy/ - Do It Yourself

Anonymous Thu Dec 26 22:00:29 2019 No.1740694 [View]
File: 2.24 MB, 1920x1080, IMG_20191226_214901.png [View same] [iqdb] [saucenao] [google]

Alright, I'm re-implementing my lm3916 amplifier using an lm358 op amp.
When I was testing it with regular audio, I was getting crazy transients several orders of magnitude larger than the amplified audio signal. Now I'm testing using a ~130 Hz sine wave, with a gain of 2, and there's anomalies at what would be the negative maximum of the wave. What am I fucking up here? I think it might be due to the audio input's negative portion exceeding the max input negative voltage of -.3 volts.

Do I need to DC bias the audio signal input, then remove the DC offset after amplification? Or should I just rectify it before the signal even hits the op amp?

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/diy/ - Do It Yourself

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