Hey all, just completed my sammichSID, really nice straigtforward design. Many thanks to Wilba.
Got as far as loading the patches on and the firmware, but just went through the final voltage check before installing the SIDs and discovered a few oddities. The voltage between pin 28 (top-right corner) and pin 14 (bottom-left corner) of each SID's IC socket is not what it should be. I'm using 6582A SIDs and the voltage there should be 9V, instead I'm getting around 5V (4.16v to be exact).
I've tried it with both the 12v AC powersupply that Wilba sent me and a 12v DC regulated supply which I had already and I get the same voltages.
J20 should be 9v I get 8.16v
J2 should be 5v I get 4.16v
J1 should be 12v I get 11.11
On the voltage regulator 7809(9v) where I should get 12v I get 9.76v
On the voltage regulator 7809(9v) where I should get 9v I get 8.16v
I've double and triple checked everything in the guide. I was also very careful to solder everything quickly and there don't seem to be any dry solder joints, but who knows I may have botched something.
Has anyone else experienced this or have an idea as to what I may have done wrong?
Thanks all, glad to be starting in this wonderful world of SID synths.
Benji