[sdiy] Vactrol matching ( Was Do LDRs and/or LEDs age?)

[ASSI]

On Wednesday 18 June 2003 17:19, Scott Stites wrote:
> I assume Don Buchla was testing for a specific resistance at a given
> LED current. Does anyone have the specifics of the criteria for
> matching that he used?  Was it a curve of several testpoints, or just
> "this vactrol is X ohms at X mA LED current" at one point?

Has anybody used those modern analog couplers?

Agilent HPCL-4562, 6N139
Infineon IL300, SFH6318
QT H11F
Motorola IL213

Or with CMOS output (not cheap because these are meant for relay 
replacement):
Infineon LH1540AT, LH1503, LH1521

There's of course LDR couplers well:
Silonex NSL32



Achim.
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