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Old 1st January 2013, 05:11 AM   #11
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Solder a 100nF capacitor between the power pins of the opamp. You can put it on the back of the board. This will vastly improve the current power supply decoupling, which on a highspeed opamp like the LM4562 is very important.
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Old 1st January 2013, 02:22 PM   #12
Bonsai is offline Bonsai  England
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Location: Norfolk, England
Originally Posted by JesseG View Post
Hi all:

For those of you who might be interested how this turned out, I got the hum fixed.

A freind offered a suggestion for a very simple mod (see PCB image. This killed the ground loop and the hum.

Initial listening impressions are: superb bass, very balanced and natural overall. Highs seem a bit reduced (but just a bit). This is probably due to my choice of eq caps.

Next one I will get first-rate caps and, in the meantime I will be working on my PCB skills. If anyone has any suggestions where to get beginner's info on PCB layout, I would appreciate it.

Onward and upward (hopefully).

Neat solution!!!!
Amplifier Design and Construction for MUSIC!
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