I think it's most noticeable when turned down past noon. The decay of the notes get shortened.To you guys who put this together, how dramatic is the volts control?
I agree. This would probably vary if you swapped chips too, because opamps can run at a variety of voltages, so the specs of the opamp would determine the behavior of shifting the bias point like that.jonasx26 wrote:I think it's most noticeable when turned down past noon. The decay of the notes get shortened.To you guys who put this together, how dramatic is the volts control?
When set real low it'll glitch out and do weird (cool) stuff.
I was also surprised at how the volts-control only affects the opamps. Cool idea, definitely.
durham-crazy-horse-schematic.pdf
Ken
phibes and Barcode.. at this time should I delete all previous schematics to save confusion ?..phibes wrote:Alright, the diode orientation of D5 and D6 was my fuck up after all. I jotted it down wrong. Here's the updated schematic. Rev 2.0 will be most current.
Sorry!
culturejam wrote: We are equal opportunity exposure artists.
culturejam wrote: We are equal opportunity exposure artists.
Haha actually I drew the prelim schematic from the way you had them drawn onto the board shot you sent me. When I went to verify against my board after clearing the shit off, I musta looked at it from the wrong end!!! Whoops! She should be right now.Barcode wrote:Well CRAP Phibes! But I'm confused. When I degooped I also had the 1n4148's in the orientation on your previous schem... ???
Ken 
![[smilie=a_chuckle.gif]](./images/smilies/a_chuckle.gif "a_chuckle"){kind=small}
I must admit it seems very strange to me.RnFR wrote:even with them switched, having that diode hanging off makes no sense at all. you guys are sure it wasn't connected anywhere?
I'm not saying that it definitely should be connected though, as some have guessed in the past that there was a single led in a nfb loop, which always made sense to me with the samples I have heard. so hey, who knows. maybe it's just Durham being mysterious.
culturejam wrote: We are equal opportunity exposure artists.
I remember reading on another board that Durham had some iffy early boards made by a third party - why not use them up? Maybe the intention was to tie it in, put it on a switch or something...Might have paired up well with the sag circuit. I guess he bailed on it? If the boards were third party, maybe they were populated by someone other than him, too. In that case, it's just easier to have those components dropped in, especially if everything on the board is super common parts and values, cheap greenies, etc. Just get 'em populated per "revision 1" plans or whatever it was, and only wire up the relevant parts.RnFR wrote:even with them switched, having that diode hanging off makes no sense at all. you guys are sure it wasn't connected anywhere?
I'm not saying that it definitely should be connected though, as some have guessed in the past that there was a single led in a nfb loop, which always made sense to me with the samples I have heard. so hey, who knows. maybe it's just Durham being mysterious.
Ken Is this for sure a two layer board? Is there a chance this is a 3-4 layer board and they just hid the diode connections?phibes wrote:Yeah the diodes are a mind fuck. No leads were soldered under the board and after the goop was gone, there was no kind of jumpering on top. Just the two diodes soldered into place. The pad that doesn't connect anywhere sits alone. I've tried to make sense of it but really, it's hard to say. It could of been a simple board error. Under the board the were a few leads running to pins on the opamp where you think they just would of used traces so it wouldn't surprise me if that part just got looked over. There isn't anything silk screened for them on the board either.
Again, for that to be the case, the hole would have to show continuity to another pad somewhere on the board. it does not.Steven_M wrote:Is this for sure a two layer board? Is there a chance this is a 3-4 layer board and they just hid the diode connections?phibes wrote:Yeah the diodes are a mind fuck. No leads were soldered under the board and after the goop was gone, there was no kind of jumpering on top. Just the two diodes soldered into place. The pad that doesn't connect anywhere sits alone. I've tried to make sense of it but really, it's hard to say. It could of been a simple board error. Under the board the were a few leads running to pins on the opamp where you think they just would of used traces so it wouldn't surprise me if that part just got looked over. There isn't anything silk screened for them on the board either.
Gotcha. Thanks!Barcode wrote:Again, for that to be the case, the hole would have to show continuity to another pad somewhere on the board. it does not.Steven_M wrote:Is this for sure a two layer board? Is there a chance this is a 3-4 layer board and they just hid the diode connections?phibes wrote:Yeah the diodes are a mind fuck. No leads were soldered under the board and after the goop was gone, there was no kind of jumpering on top. Just the two diodes soldered into place. The pad that doesn't connect anywhere sits alone. I've tried to make sense of it but really, it's hard to say. It could of been a simple board error. Under the board the were a few leads running to pins on the opamp where you think they just would of used traces so it wouldn't surprise me if that part just got looked over. There isn't anything silk screened for them on the board either.
Ken Barcode wrote:I think Greg is skittish, so feel free.
that entertains me Barcode. I have a friend who will tell you there's nothing wrong with his dog.. it's just a bit skittish - after it's just torn a hole in your leg.culturejam wrote: We are equal opportunity exposure artists.
