coltonius
Well-known member
Hey, all.
Analog modulation / delays are my Achilles heel, so I need some help here.
The Problem:
The Facts:
So what gives? It seems like the modulation board is working since there's a single chorused repeat when toggling in either direction.
The BOM: Madbean AquaBaby ModBoard
The Photos:
Analog modulation / delays are my Achilles heel, so I need some help here.
The Problem:
- The modulation does not work when I toggle it on.. sort of. The first repeat will be modulated if the delay is on when I flip the toggle. It does this in either direction (on or off). After that, nada.
The Facts:
- Delay works perfectly. No problems with the main PCB.
- The only voltage measurements provided in the AB Mod BOM are for the IC, which measures perfectly: 9v at pin 8, 0v at pin 4.
- The internal red LED flashes appropriately. So does the external LED, which is a waterclear orange cleverly disguised on the right side under the knobs.
- Rate works perfectly, varying LED flash speed.
- The photocell is a leftover 9203 from a pile I bought at Small Bear and used on an ElectroVibe build (which was a success).
- The photocell resistance does seem to be changing with the red LED and with movement from the Depth pot.
- I used to have the LED and photo cell shrink wrapped to protect from light, but I removed it when troubleshooting.
So what gives? It seems like the modulation board is working since there's a single chorused repeat when toggling in either direction.
The BOM: Madbean AquaBaby ModBoard
- I used Wiring1 on page 4 to connect to the main PCB. (Note that the way he's drawn the pots offboard does not match the schematic; Rate should have 2 wires because Lugs 2 and 3 are connected, not so on Depth.)
The Photos: