[sdiy] Student projects from my Spring 2008 class posted

[Tom Bugs]

Hi Aaron

Thanks for sharing those - there's some really interesting projects (the 
Pitch to Voltage caught my eye in particular) - sounds like a really 
inspiring course.

I wondered whether the Scream Machine problems (or the cause of its 
unstable wonder, perhaps?!) may be the powering of the CD4069. It seems 
like the design realises that the CMOS chip has a max supply voltage  of 
18v, hence the resistors R29-32, but maybe that isn't the most stable 
way to get a +/- 7.5v supply for it. (surely 10u bypass caps should be 
added at least?). I think there are some Buchla (or clone) schems for 
LPG floating around that show a simple way to get a stable supply, but I 
can't locate them right now.

Nice works!
Best,
Tom

Aaron Lanterman wrote:
> See here:
>
> http://users.ece.gatech.edu/~lanterma/studentprojects
>
> Also, you'll find projects from Fall and Spring 2006. (In the Spring 
> 2008, I relaxed the degree to which the project needed to be novel - 
> modularizing part of a synth without much modification was sufficient, 
> since I was awfully busy with a newborn I didn't have time to help 
> debug in lab as much as I normally would, so I steered them away from 
> riskier things.)
>
> I would be thrilled if other folks tried building these things and 
> improving upon these projects. In particular, check out the Sallen-Key 
> bandpass and highpass filters (a true pure 2nd order S-K highpass, not 
> a swap-input-and-ground on lowpass S-K like in the MS-20) by Fojas and 
> Thomas. The designs were inspired by the SSM2040 datasheet, but I 
> don't recall seeing a real S-K bandpass and highpass actually 
> implemented before.
>
> Luke's report on the Music Easel timber generator was kinda nice and 
> had some cool scope plots.
>
> - Aaron
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