[sdiy] Re: LDR decay time

[harrybissell]

Hmmm... do you really suppose that Musitronics hand picked the
optos in the Mutron III ???

Of course, hand matching cells might be done / a good idea in a stereo
compressor where it would be noticed.... and I have heard phaser guru
Mike Irwin has been known to suffer sleepless nights laboriously selecting
cells for his creations...

H^) harry  (or was that 'sheepless' nights ???  :^)

Paul Higgins wrote:

> Well, you _can_ make optocouplers yourself with a little heatshrink
> tubing and maybe some black paint, but they won't have the same
> consistent level of performance that you could get in the commercially
> made ones.  It depends what you're using them for.  I think for audio
> switches (as in Mesa/Boogie amps), you can be pretty sloppy with how
> well they're made.  For compressors, Mutron III clones, etc., you're
> going to be doing some precision matching, I'm sure.
>
> -PRH
>
> On Wednesday, April 28, 2004, at 04:01 PM, Metrophage wrote:
>
> > Oh, shitty death! I thought it was odd that the US page for Hamamatsu
> > was turning up blanks for their own product numbers!
> >
> > <
> > http://www.hpk.co.jp/Eng/products/ssd/pdf/
> > abolished_product_information/
> > photocoupler_030901.pdf >
> >
> > I love it how products get "obselesced" despite the fact that there
> > isn't anything else which performs the same function.
>
> Paul Higgins
> email: higg0008 at tc.umn.edu