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schmidtc

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Posts posted by schmidtc

  1. Sammich preset upload: Only 2 patches take?

    in MIDIbox SID

    Posted

    I built my second sammichSID a few years back and loaded V1.9g V2.0RC38 onto it, but only now am I getting around to actually putting some presets on it. When I upload v2_vintage_bank.syx only presets 34 and 36 actually take and it skips the rest. I tried sending the sammich_SID_Setup.hex over in case it needs the newer firmware, but this gives a "checksum mismatch error no response from core after 16 retries" I'll fiddle with transfering a sysex dump from my other sammich and try that route, but any advice is much appreciated. Maybe Wilba still has a buy me a beer icon.

  3. Sammich Encoder acting oddly

    in MIDIbox SID

    Posted

    Hi All,

    The encoder on my Sammich rev2 started behaving oddly today, was working normallly. It will often skip steps 4 of turning clockwise. Counterclockwise it sometimes increases steps in increments of 1's or 4's. I need it for a show so I'm in a bit of a pinch now and I'm going to try soldering in another encoder from my sammichFM kit (sadly still in it's box), assuming they're compatible. Is there anything besides the encoder I should check? Is there a schematic available?

    Thanks!

  10. Drum engine midi mapping unstable?

    in MIDIbox SID

    Posted

    Hi all.

    I'm finally giving my sammich 6581 the time it deserves. . . but it's behaving oddly.

    When I play the drum sounds over a midi keyboard the mapping jumps around. For instance, a bass drum will be on C#1, but after I play a few more keys it either disappears completely or gets replaced by another sound. The mapping also has several dead zones on the keyboard where a group of 6 or 7 keys in a row don't trigger the Sid.

    Is this some weird note stealing thing that's normal or is this a more serious problem? Thanks!

  12. Low 12V rail on the Sammich

    in MIDIbox SID

    Posted

    Thanks Wilba,

    I should've mentioned it's got the low level LCD and I was planning to use some 6581's. I tried a different power supply that outputs 12VDC regulated at 1A. Same problem. The new one puts out 11.92V so the DMM readings above are all the same with the new PSU, only a little less, that is:

    Between the 2 J1 terminals: 11.92V

    Between base board ground and J1 1: -.73V

    Between base board ground and J1 2: 11.20V

    All 12V connections to base board ground: 10.47V

    All 9V connections to base board ground: 8.98V

    All 5V connections to base board ground: 4.99V

    I'm a novice at his stuff, and I don't understand the purpose of running a regulated PSU though a full wave rectifier. Is it to filter AC? Won't the output always be two diode drops below below the regulated input? i.e. isn't ~13.4 needed to give the 6581's the 12V they need? I can't thank you enough for putting together any awesome kit AND taking the time to help troubleshoot this kind of stuff.

  13. Low 12V rail on the Sammich

    in MIDIbox SID

    Posted

    Hi All,

    I was about to drop the SIDs in when I noticed the 12V rail is only 10.72V everywhere. I'm using an old Caere DC PSU with the center positive. It says it outputs 12VDC 400mA regulated OR 12VDC 500mA regulated, which seemed weird but I figured either was ok. My scope/DMM gives the following:

    Between the 2 J1 terminals: 12.19V

    Between base board ground and J1 1: -.73V

    Between base board ground and J1 2: 11.45V

    All 12V connections to base board ground: 10.72V

    All 9V connections to base board ground: 8.98V

    All 5V connections to base board ground: 4.99V

    Seems like things are off by a diode drop or two here and there? Perhaps I need a new DC supply with more umph. Any Ideas are much appreciated. Thanks!

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