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Interesting teardown of the Roland JD-XA. Four analog voices are full of LM13700 OTAs and no sign of any custom analog voice chips. If it’s good enough for Roland...
Madbean Stage Fright
This sounds really good. The difference between the 5 and 6 stages is very noticeable. Overall a very musical effect.
I built this from a madbean pcb. The layout was great and everything went together well. I drilled a 125B sized box following the drilling guide but, couldn’t get it to fit in the box! The jacks hit the tops of the chips. I’m guessing that this because I used sockets. There is probably a mention of this in the build notes that I overlooked.
In the end I drilled a 1590BB sized box. Which worked very well. I think I like this better than the 125B size.
Madbean Stage Fright was originally published on Super-Freq
My ms20 last night at gosport
LM13700 VCF
This design is originally by René Schmitz and is (half) an MS-20 filter but with an LM13700 chip instead. I have found a pretty solid layout on a forum called "electro-music.com" by user Clack, but since that topic is from 2010 I decided to try and fix it a bit:
A couple of changes on mine: 1) R13.1 and R13.2 was originally just one 10K resister but I've found that a bit loud and got a more stable but devestating result when putting a 6.8K and 2.7K resistor in parallel with eachother. You could manage using a 10K trimpot here as well of course!
2) The transistors T1 and T2 are reversed now and are 2N3906's. There wasn't a cut between the bases before, there is now.
3) Cut was removed for IC2's pin 11 connection to -12v rail.
4) I've actually put diodes in this layout, but on my PCB it has LEDs (any diode can be used actually, and they light up a bit when you have the resonance up... Bit useless when it's hidden inside your modular of course haha..).
5) I've used an LF347 instead of TL074 because I had them laying around.
If you follow this layout your filter should be working with both +15/-15v and +12/-12v.
Will edit this post with audio clips when I can.
