This is my implementation of this circuit, for connecting a Teensy 3.0 to an MSGEQ7. It worked fine when I set it up on a breadboard, but now I've soldered it onto veroboard it doesn't.
Checking through with my multimeter, I find the capacitance between pin 8 (bottom left as pictured) and the Teensy's AGND pin (connected to the black wire in the middle) to be 79pF, rather that the 20pF* it was when I measured the component before soldering.
Is there anything wrong with soldering one leg of the 100nF from pin 6 to the leg of the 10pF? They're both meant to be connected to ground according to the schematic.
- Looking closer at the capacitor itself, it's marked "10", which should mean it's 10pF in the first place? Might I have damaged the capacitor while soldering?