[sdiy] LED/LDR modules

[mikko.a.helin at nokia.com]

Unfortunately the better NSL-32SR's aren't available through Farnell, only
the slower NSL-32, though NSL-37V51 (which is available on Farnell) seems to
be even faster that NSL-32SR. If a man builds a compessor using these is
there need for RMS/LOG converter (SSM2210) as used on most VCA based
compressors? LDR's are exponential to LED current, right?

-Mikko

> -----Original Message-----
> From: ext Joachim Verghese [mailto:jocke at netcontrol.fi]
> Sent: 13. February 2001 12:56
> To: Synth-DIY
> Subject: Re: [sdiy] LED/LDR modules
> 
> 
> Hi,
> 
> > 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.
> 
> I've also seen them in products by Dunlop (MXR Phase 100 reissue)
> and Motion Sound (R3-147 rack mount rotating speaker).
> 
> BTW, isn't it reassuring to see these comparatively lo-tech
> optoelectrical components being used in current commercial products?
> Not that I'm anti-DSP or anything, but lo-tech has charm (and usually 
> sounds good, too)!
> 
> > 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.
> 
> That's correct, and to recap:
> 
> http://www.silonex.com/datasheets/index.html
> (Scroll down to "optocouplers")
> 
> Vactrols:
> http://opto.perkinelmer.com/products/catalog/familylisting/fam
ily699.asp
(they used to have datasheets, but...)

Clairex:
http://www.clairex.com/shortform.asp?category=Optocouplers&Page=1

Hamamatsu:
http://usa.hamamatsu.com/opto-semi/hybrid/p873.htm
http://www.hpk.co.jp/hp2e/products/ssd/CPRE/CouplerE.htm

-joachim