krabbencutter
Well-known member
I'm having an issue with a gyrator filter I built. In the attached video you can see that there's some strange pulsing/oscillation going on from 50Hz upwards. I'm using NE5532 Opamps and a linear +/-12V Power supply. I have 10uF bypass caps on both supply rails as well as 100nF on all Opamp power pins. If anyone has an idea what might be going on here, I'll greatly appreciate it. You can also find some pictures of my perfboard as well as the schematic attached.
The two rightmost opamps on the perfboard are balanced I/O and the issue seems to only appear on the gyrator filter. If I bypass the filter and send the signal only through the balanced I/O everything is fine. Swapping the Opamp didn't help.
The two rightmost opamps on the perfboard are balanced I/O and the issue seems to only appear on the gyrator filter. If I bypass the filter and send the signal only through the balanced I/O everything is fine. Swapping the Opamp didn't help.
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The gyrator topology could be the culprit here and I'll try something different once I'm back at my bench tonight.
