Nice build. I need to make another one of these, it was one of my early builds. I'd be interested in testing op amps for this. I've read that the 4558 can be kinda...bad. Maybe TL072 or 5532 would be better?
I have the following schematic and voltages....I was under the impression that the 10K resistors form a voltage divider and VCC should therefore be ~4.5V, am I wrong?
I placed an order for one enclosure drilled and painted on July 27th, and it's still pending on the paint side. I don't think I've ever had one take so long before. If it doesn't move along shortly I'll email them