[sdiy] Silonex optocouplers

[Tim Parkhurst]

> -----Original Message-----
> From: Scott Gravenhorst [mailto:music.maker at gte.net]
> Sent: Wednesday, October 23, 2002 8:49 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Silonex optocouplers
> 
> 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."

Hi Scott,

Yeah, I think it wouldn't be too much of a trick to make the transfer
function linear. I thought I saw some charts in one of the ap notes (audio
compressor) that showed linearization with some active feedback. I'm gonna
grab a few (what the heck, they're the one's that suggested it), although
it's going to be a little while before I have a workbench area set up (moved
not too long ago & money's tight since my girlfriend is still looking for
work). 

Let me know if you come up with anything interesting on these.

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.
***************************************************************************