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New memberon the list, and obviously I’m here in need of help.
The otherday a took delivery on a 9 voice SDS7 where seller pointed out it needed a newbattery and that one channel was triggering all the time. As it turn out thisthing need a lot more help than that.
I found sensitivitypotentiometer on one channel broken off. Hopefully this is the retrigger issue.Sourcing 16mm pot with long 4mm shaft will prof difficult I think. Anyone inthe know where to get one? If not I’ll try to reuse the old 4mm shaft and use shrinktube and glue to a standard 5k Alpha pot with 6mm shaft.
Battery I’llprobably copy Jesper’s approach. One question regarding the original battery. Tryingto source a new NC-M battery I found that there is something called Lithium-ionNCM. This is a battery that can be charged. To clarify, do SDS7 charge theoriginal battery or is it a Nickel Cadmium?
Readable schematicfor SDS7 has also proven difficult to find? I’m trying to get aunderstanding/documentation of the card buss and how and when the main boardissue sound parameters to the bus/voices. Is it sending CV or data?
The firstSDS7 I owned way back when you had to trade your car for a SDS7 kit had a rathernervous fly wheel selector knob build with LED’s and light sensitive resistors.My "new" specimen has a closed dented selector. It looks like its originalmounted. I can understand why they changed it. But the speed wheel thing wasgreat fun in use, when it functioned that is.
I’ve postedpictures of my disassembled SDS7 at http://snw.lonningdal.no/sds7/
I easilyget side tracked with new ideas and projects. But my intention for the SDS7 isto modify it when I’ve sorted out some of the quirkiness mine has. I’ll like tohave 3.5mm trigger inputs on front panel. Maybe try replacing a couple of theEPROM’s with Flash chips. Or load SRAM from SD card using Arduino. If I can getmy head around the bus structure maybe I can have real-time modulation with CV controlfor some of the parameters?