Alt-BEAM Archive

Message #07877



To: beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Sat, 20 Nov 1999 18:14:49 -0700
Subject: RE: Cholroplast thingy



> Hey Craig,
>
> Yep, you have to use low leakage fet input opamps, especially if you use
> LEDs for photocells together with small low leakage caps. I would change
the
> circuit slightly as shown in the attached to improve efficiency (kind of
> important with solar engines). With 5V(min) you can easily drive the
mosfet
> gates. Not yet tested but uses fewer components, lower forward voltage.
Note
> the 0.001 caps are used with the clear LED type (low sensitivity)
> photodiodes for filtering and snappy positive feedback. Exact cap values
to
> be determined empirically.
>
> regards
>



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