My first post on this site. I spent 25 years in the Navy fixing information systems and digital combat systems. So, my electronix expertise is pretty thin.
I have an Infinity Basslink in my car's trunk. It provides the level of bass re-enforcement that I like. The only problem is that its cut-off frequency is 200hz. I'd like to change that to ~400hz.
The block diagram for my Basslink starts on page 36 of the first attachment. In that schematic pot VR203 (0-50kohm) controls the low freq cut-off of op amp U204B, a New Japan Radio NJM4558L. The second attachment is the spec sheet for the op amp. When the pot is fully CW the cut-off freq is 200hz. Obviously, the pot is not the issue here, but the op amp.
So, what I'm asking for is suggestions for a replacement op amp so that the highest cut-off freq is ~400hz. Yes, I've checked Mouser, Newark and Digikey - no help.
Thanks,
Mark
I have an Infinity Basslink in my car's trunk. It provides the level of bass re-enforcement that I like. The only problem is that its cut-off frequency is 200hz. I'd like to change that to ~400hz.
The block diagram for my Basslink starts on page 36 of the first attachment. In that schematic pot VR203 (0-50kohm) controls the low freq cut-off of op amp U204B, a New Japan Radio NJM4558L. The second attachment is the spec sheet for the op amp. When the pot is fully CW the cut-off freq is 200hz. Obviously, the pot is not the issue here, but the op amp.
So, what I'm asking for is suggestions for a replacement op amp so that the highest cut-off freq is ~400hz. Yes, I've checked Mouser, Newark and Digikey - no help.
Thanks,
Mark
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