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#2501
wilkie1
Moderator

First, I think I see that you have the Board Out wired to the wrong pad on the OUT of the board.  The small “T” designates the tip wire that needs to be wired to the BO on the 3PDT

Check this and then we can look for the squeal.  That is usually a sign of oscillation in the IC.  I also think that the TR1 is turned fully clockwise which should not be necessary.