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Got this together, tested that it worked, it did, so boxed it up…
I didn’t verify the volume, just the function.
I like the sound of it, but it’s quiet. With the boost switch on and the volume all the way up, it’s about at unity.
Reflowed all the resistor connections, the pot connections, and the capacitor connections I could reach.
Wiggled the socketed components to no difference.
Swapped the TL072 to another, to no difference.
Best I can think is that it’s a joint I haven’t reflowed yet–but I figure that would be intermittent or off, not consistent quiet volume–or a value’s off that I missed.
All values were tested before installation, but if I swapped a spot…
All the values that I can see look to be correct. To help any further we need clear photos of the board underside and all off board wiring, accompanied by voltages readings of input voltage and from pins of the mosfets and the IC. Should be standard for any support post. Check out Barry’s Crash Course on the Guides page.
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