[sdiy] A new Synth Project

[Harry Bissell]

yikes I don't see too well either anymore (at least not on my laptop screen...) I suppose i could download it
to blow the pages up and get the page numbers but...

is that your take on the bandpass filter from the PAiA2720 synth... with an LM13700 instead of diodes for tuning ?
(its the transistor and twin-tee circuit...)

Is that why its called Cheezy ?  Actually, the bandpass filter was the only good filter on the 2720... the LPF was nearly
useless...

H^) harry


----- Original Message -----
From: James Patchell <patchell at cox.net>
To: synthdiy diy <synth-diy at dropmix.xs4all.nl>
Sent: Thu, 19 Jan 2012 15:01:21 -0500 (EST)
Subject: [sdiy] A new Synth Project

     When I lost most of my eyesight, I didn't think I would ever do 
something like this again...but here I go again.

     Back around 1999, I did this project:

http://www.noniandjim.com/Jim/smb1/smb.html

     This board was huge (15" x 10").   And it was so big, building it 
was a real problem.  (Although, back then I could see).  I don't 
remember the component count, but it was a lot.

Well, I got the hankering to give it another try.  But this time, I was 
going to keep it much smaller.  I have got the schematic about 95% 
complete at this time, and after counting the pages, it came to 32.  
Hmmm....not exactly as minimalist as I intended.  I call this one the 
SMBC, which stands for Synth Module Board - Cheezy.

     It includes an AVR X-Mega controller which will do 
Midi/Sequencer/User Interface duties.  Anyway, here is a very prelim 
schematic.

http://www.noniandjim.com/Jim/SMBCheezy/100-1059.pdf

And the webpage is at:

http://www.noniandjim.com/Jim/SMBCheezy/SMBCheese.html

When I am done with this project, it will be "Open Source".

-Jim


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-- 
Harry Bissell & Nora Abdullah 4eva