SV: Re: [sdiy] Mystery component needs identification

[Karl Ekdahl]

Ray,

> Guessing here... Maybe it's an optoisolator (or
> vactrol) made with a cadmium 
> sulfide cell and led.

This is what i'm suspecting though only having seen
vactrols on image i was less than convinced.

Is there any safe way of testing these, i really don't
want to blow them in case they are vactrols as i know
those to be fairly expensive and inaccessible. 

Resistance measurements inbetween the two grey leads
gives around 2K and the golden leads gives an unsteady
500K-750K. There is resistance inbetween the golden
and grey leads and this resistance changes with
polarity (about 1.2M one way and 500K the other),
perhaps this is a clue to this *not* being a vactrol?

Karl



--- Ray Wilson <raywilson at comcast.net> skrev:

> 
> Just guessing though I did not look up the number or
> anything.
> 
> Ray
> 
> 
> 
> ----- Original Message ----- 
> From: "Karl Ekdahl" <elektrodwarf at yahoo.se>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, September 17, 2006 7:13 PM
> Subject: [sdiy] Mystery component needs
> identification
> 
> 
> > Hi list, i just got a couple of weird components
> that
> > need identification.
> >
> > The packaging is a small metal tube, about 2.5cm
> long
> > and about 7mm diameter. From each end there's two
> > leads sticking out, one golden and one silver. On
> the
> > packaging i read "E24A1L-4", "Q TRON INC" and
> "SANTA
> > ANA CA".
> >
> > Any clues?
> >
> > Thanks
> >
> > Karl 
> 
>