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buffered multi?
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author buffered multi?
chinard
recently i have been having some impedance issues with splitting my VC pitch to several different sources. It actually seems to be throwing off my pitch tracking to a significant extent.
i was thinking about slapping together a buffered multi similar to the plan b model 31 or those multi's from the mattson mini modular.
Just wondering if anybody has any schematics for this type of circuit or ideas how this is done. I cant imagine it being too horribly complicated
Kwote
blacet has a nice splitter

http://blacet.com/SB27802790ManualBasic.pdf

you'd have to buy it or know someone who has it to check out the schematic though.
neandrewthal
Since I'm such an MFOS fanboy we're not worthy

http://www.musicfromouterspace.com/analogsynth/cvdistributor.html
Kwote
Gawdammit! stop making me like MFOS so much. angry
neandrewthal
don't fight it
chinard
ah there we are..
thats exactly what i was looking for.


quick question for those of you familiar with MFOS kits
this project uses a TL084 Multi Purpose PCB which seems to be a PCB used on a few of their projects but i dont see it on their PCB's for sale section.
Does someone else make/sell this board? (i dont really feel like etching and drilling a PCB for such a simple circuit)
neandrewthal
No one sells that exact board, but there are several options for similar general purpose boards for constructing simple repetitive circuits:

http://www.tellun.com/motm/diy/muub/muub.html
http://www.bridechamber.com/bridechamber.com/Buffer%20PCB.html
http://www.cgs.synth.net/modules/cgs70_mix.html
fonik
i am not quite sure if these splitters will solve your problem entirely. since the VCOs will still draw current from the distributor through an output impedance there will be some voltage drop. the MFOS has an output impedance of just only 100R (instead of common 1K) so this may not count?
i don't know. any experiences with these?

for now i solved this problem in a ...err... problematic way: i removed the 1K output protecting resistor of my MIDI2CV module. the output is now unprotected but i got rid of the current dependend voltage drop.
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