Carlos,
Thank you very much for the clear and detailed information. It is very easy to work with you in troubleshooting your pedal. I wish all our customers could communicate as well as you.
That’s no problem about the bags being thrown away. The numbers on the bags might have been helpful to me but it’s not necessary.
Thank you for the photos you emailed me. The optocouplers look mostly good, but there was one angle that kind of looked like they may need some more sealant. Here’s the edited photo…
https://zeppelindesignlabs.com/wp-content/uploads/2023/01/20230128_145356.png
…but if you tested them with your spotlight and they didn’t change resistance then they are probably sealed…but it would be good to be extra cautious in this matter just to rule out all the variables we can.
When I was designing the VPM-1 I looked into using the NSL-32 optocoupler, but it was hard to get consistent result from them…at least from the batch that I was testing. I ended up spending a couple of months developing my own rigorous test procedure for LDRs that we purchase in bulk. It ended up being way more reliable and economical for us to sort our own LDRs. But in looking at the datasheet for the NSL32SR2 (sorted) variety, they should be matched enough to work with the stereo VPM-1 (any type A-G). That’s assuming the datasheet is correct. I’ve often had a hard time getting the promised results from LDR datasheets in real-life situations. But if you have the sorted variety you can give them a try. It shouldn’t matter which optocoupler goes in which location, if they really do have those specs.
Good luck!
-Brach
