[sdiy] Seeking project ideas for my class

[Harry Bissell]

one LED with four photocells around it might not be ideal, LEDs
can be quite directional. Might need a really diffuse LED ???

I had trouble with two photocells and one LED in the middle, ended
up with TWO LEDs, one directly facing each photocell...

H^) harry


----- Original Message -----
From: Tom Corbitt <tom.corbitt at gmail.com>
To: Aaron Lanterman <lanterma at ece.gatech.edu>
Cc: synth diy <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 12 Apr 2010 11:42:28 -0400 (EDT)
Subject: Re: [sdiy] Seeking project ideas for my class

Looking at your list, I thought I'd point out that what you're
describing below (at least w/ respect to the LED's) is the heart of
the Univibe, complete with shield.

As an engineer, I'm constantly reinventing things that people worked
out decades ago. I recently needed to control several shift registers
from one source. I worked out the logic, felt pretty proud of myself,
then looked at the data sheet realized that someone years ago had the
same problem and rolled it into the chip.

Tom Corbitt

========================================================

OK, I just had a crazy idea... We've looked at
four-pole-LPF-with-feedback cascades using OTAs in place of resistors.
We've also briefly talked about vactrols. How about putting a single
LED in the center of four LDRs, placed equally spaced around the LED?
Those LDRs could then replace the resistors, and you could control all
four stages at once just by changing the current through a single LED.
It would be a sort of make-your-own super-vactrol. You'd probably want
to cover up the LED/LDR setup somehow so external light wouldn't
effect it.

On Sun, Apr 11, 2010 at 2:54 AM, Aaron Lanterman
<lanterma at ece.gatech.edu> wrote:
> I put a bunch here:
>
> http://users.ece.gatech.edu/~lanterma/ems10/projectideas_sp10.html
>
> If you have any others you think would be fun to try, let me know and I will post them.
>
> We're getting a late start on the project, which is why I'm not particularly requiring that the designs be original... they need to be things that could be tested and built by the beginning of May.
>
> - Aaron
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-- 
Harry Bissell & Nora Abdullah 4eva