[sdiy] Seeking project ideas for my class

[ASSI]

On Monday 12 April 2010, Tom Corbitt wrote:
> 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.

Replace the LED with a bulb, then head over to Jürgen Haible's 
homepage and look at the picture next to "Projects with PCBs"... it's 
the "Krautrock" phaser, in case you're wondering.


Achim.
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