Questions about 18v operation

[e_man]

I hope this is the correct place to post this question.

Upon completing the V1 Copper (one of the bonus PCBs offered), I found the circuit generated a high frequency noise most prominent when the volume and gain controls were set above 50%.

Some research suggested that a 1054 charge pump may eliminate the noise.  It did not.  I have tried both the 7660SC and the 1054CP (the 1054 was noisier).  I don’t have any 1044s on hand.

Running the circuit at 18v solves the noise problem, but prevents me from combining it with a couple of other circuits for a triple combo I had in mind.

Are there any components that could be changed to eliminate the noise?

Any guidance would be appreciated.

Thanks.

[Author]

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