[sdiy] Silonex optocouplers

[Scott Gravenhorst]

Cool thing.  "acts like a resistor" means (to me) no nonlinear effects ala 
FET.  My only question would be (and I didn't see mention of this in a 
datasheet) is the LED current to cell resistance transfer function 
linearity.  I have my doubts though, I don't imagine the current to light 
output of a LED is very linear in the first place.  Since the LED drives the 
cell, any nonlinearity in the LED I to photon output could be problematic.  
I suppose one could put one in the feedback loop of an opamp circuit to 
compensate for gross linearity problems.

It says right on their site:  "Why wait?  Ask for samples."

Tim Parkhurst <tparkhurst at siliconbandwidth.com> wrote:
>Hello All,
>
>Has anyone tried the optocouplers available from Silonex? They have a very
>wide range of parts along with some ap notes and schematics for audio
>applications. Maybe a good Vactrol substitute? Maybe even a replacement for
>the now defunct Burr-Brown VCA610 in powered speakers (Peter G)?
>
>http://www.silonex.com/audiohm/index.html
>
>The web site states
>"Silonex Audiohm optocouplers are ideally suited for high performance audio
>circuits. Most "design-ins" have demonstrated proven performance benefits
>over silicon based audio control devices such as VCAs and FETs. Audiohm
>optocouplers act in a circuit as a passive component, like a resistor, but
>are very dynamic. Effectively the component is a current controlled variable
>resistor."
>
>They list Allied as a distributor. A check showed several of the items in
>stock, and prices ranging from about 2 to 4 bucks a pop. The NSL-32SR3 looks
>particularly interesting. It ranges from 60 Ohms to 25 Meg (!) and has a
>'decay time' spec (time to 100K after removal of current through the LED) of
>10msec. Might make for a fairly wide range VCADSR.
>
>Tim Servo
>
>
>
>
>***************************************************************************
>This message is confidential.  The information contained in
>this e-mail message is intended only for confidential use of the
>recipient(s) named above. If the reader of this message is not the intended
>recipient or an agent responsible for delivering it to the intended
>recipient, you are hereby notified that you have received this document in
>error and that any review, dissemination, distribution, or copying of this
>message is strictly prohibited.  If you have received this communication in
>error, please notify us immediately by e-mail, and delete the original
>message.
>***************************************************************************
>
>

=========================================================  
- What good are laws that only lawyers understand?
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/FatMan/
-- NonFatMan: home1.GTE.NET/res0658s/electronics/