From Nicholas Gregorich Sent Sun, Apr 2nd 2006, 05:21
From Nicholas Gregorich Sent Sun, Apr 2nd 2006, 05:21
I think the level shifting circuit at the bottom of this magazine scan from http://www.arpodyssey.com/ may be of help. http://www.arpodyssey.com/volanski2.jpg Nick. On Saturday, April 01, 2006, at 07:16PM, Jeffrey Needham <xxxxxxxx@xxxxx-xxxxxxxxx.xxx> wrote: > >> >> If you're referring to the "Converting Gate to Switched Trigger (S- >> Trigger)" part of the Doepfer page, that will not help at all. That >> circuit is specifically for inverting positive-going voltage gates >> into Moog-type negative-going "S-Trig" gates. That is not what is >> needed by the ARP and the Roland 100M. > >> >> The ARP and Roland need both gate and trigger signals, and a >> different kind of circuit would be needed to create that. >> I don't remember offhand what the Pro One gate >> voltage is. If it's too low, then a level-shifting circuit would >> also be needed. > >I would guess 5V, but I'll measure it. So that means we are in the level >shifting business. Since the Pro-1 is about 30 acres of empty space (and >has power rails), I'm wiling to embed this in to the Pro-1. > >> >> It should be said also that sometimes, with certain synths, the >> Trigger signal is not always needed in addition to the Gate, even >> though the synth may have both Trigger and Gate inputs. it may be >> worthwhile to try simply connecting the Pro One Gate output to the >> Gate inputs of the ARP and/or Roland, and see what happens. And >> don't worry, you can't possibly damage anything to try this. I'm >> guessing that if it does work, it would more likely work on the >> Roland, and is less likely to work on the ARP. This is due to >> fundmental differences in design of the Roland and ARP envelope >> circuits. Try it! > >After staring at the Roland ENV module, it has a switch to trigger on GATE >only, so that would really just make a request for an ARP trigger. > > >Jeff Needham, Principal, Scale Abilities, Inc. >Oracle Platform Engineering / Music and Film Production >VOX 408 739 2344 FAX 408 739 2394 IP xxxxxxxx@xxxxx-xxxxxxxxx.xxx > > > > >