I just got my first speak and spell in good working condition from a charity shop, and I'm working on it at the moment, I think I have found the right points for pitch control but I'm having some problems
I'm using a 470k pot, when the pot is at 0 (no resistance) it already kills the pitch noticeably - is there anyway to prevent this? I would like to add a I/O switch for the pitch control
when I turn the pot i get a nice desirable change in pitch, but when the pot nears its peak resistance it tends to kill the circuit.
I have been trying to attach other fixed resistors in parallel with the pot but this has failed to produce decent results so far and it's becoming frustrating
I understand that there are tons of different pcb's for the speak and spell series - from what I can work out, I'm working with the british 1986 modal (as described on the datamath site) - if it helps I'm connecting one point to a solder point connected to the 4th strip from the right hand side of the cartridge slot contacts and the other point to this strip of 5 connected solder points slightly above it