[sdiy] LED/LDR modules

[Steve Ridley]

> hey there, what's the state of currently available integrated
> LED/LDR modules? i got lancaster's active filter cookbook, which
> reminded me that you can use them to VC filters, and you can
> also use them as the sense element for compressors/etc. the only
> thing is the linearity may be less than ideal, does anyone have
> any expierence with these?  i've been checking around, but
> doesn't seem like any large catalog distributors carry them, is
> there another source? i'm just looking for a few, not thousands!
> l8r..Nick

Silonex do a useful range.  Prices start around £1 (1 UK pound)
each from Farnell.  I bought a batch of ten last year and managed
to select several pairs that matched over a useful range.  I've seen
them used in Focusrite opto compressors and de-essers.

Data sheets were available on the Silonex website last time I looked.
I think it's www.silonex.com, but if it isn't, it shouldn't be difficult to
find.



Steve Ridley