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AR3109: exact sounding replacement for IR3109
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author AR3109: exact sounding replacement for IR3109
D' Naab 136
Upcoming AR3109. An exact sounding replacement for the since long obsolete Roland IR3109. Used in SH101, MC202, Jupiter4/Promars (late version), Jupiter 6, Jupiter 8, Juno 6, Juno 60, JX3P, MKS80 (early version) and maybe others.
Been working on this one for a few years now and it's almost finished.
Sound is already spot on. Expect the same level of accuracy as my latest AR80017A's. Inaudible and imposible to measure any differences in the 20-20KHz range.
However, I still see a small dip in the resonance response around 30KHz. Outside of the audible range, but some of it gets reflected back in that range by modulation with other voices in the polysynths and the clocking of the chorus in the juno's. Now working on some extra phase compensation that should get rid of this.
Power consumption is also still a bit on the high side atm. Final version will consume a lot less. This for not stressing the power supplies when you replace all of them in the polysynths and to save batteries in the portable ones.
Making this one small enough, to fit in all synths that use it, sure was an exercise in compactness: 6-layer pcb with burried parallel plate capacitors were needed to fit everything on 2cm²
Will spear on when available.
ps: Another project, that has been in the running for even longer might become available in the near future. 'might' because it has switched from possible to impossible already too many times now. Simulations look promising but I'm still waiting on the pcb's... Hint: colored dots.

Very cool! "6-layer pcb with burried parallel plate capacitors" ... I'm not worthy!
if you dont mind sharing, what are you using for your output stages? i found this to be the critical part, as they compress the signal under high resonance and low supply rails (e.g. sh101). i found some FETs that matched pretty well:
I'm also curious - but about the the exponential converter.

I've put quite a few AR80017As into Juno106s and while they do sound fantastic, I usually have some trouble getting the filter to tune and scale properly - far more trouble than with an original voice. They seem to be a little more sensitive to smal fluctuations in temperature (for example due to movement of air as someone walks past the bench) and take a little longer to settle. The synth still sounds great with them - maybe they're better for it smile

Just curious.
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