Hi! I have finished the neptune delay.
Delay works fine, all the controls are interactive, but the spst momentary switch doesn't do anything.
Since the delay works fine I have already boxed it :-\
The SW is a spst so no matter what pole goes the wires from the board right?
I have used a siliconex opto from smallbear, the longest lead of the led side goes to the square pad right?
I don't know where to orient my search...
The Siliconex usually have a mark to show you which one of the LED-side leads is negative.
Google for the datasheet for the specific part you have to verify which pins are which. It definitely does matter.
If you are having trouble with the opto, I would suggest trying a LED and LDR as separate parts. The up side is that you can if the LED is lighting up properly. And it really doesn't need to be sealed to work.