[sdiy] Mystery Vactrols/Photocouplers

[BrightBoy]

Harry,

I don't have the unit in my possession.  I'm doing all my
reverse engineering from detailed pictures of the component side
and trace side of the circuit board.  These were provided to me
from a kind soul (guitarist) in France.

Cheers,

Jeff

-----Original Message-----

Why not desolder two leads and read the
underside ???  (just a thought)

Or better yet, unsolder all four
leads so you can remove it without
bending the leads (and maybe breaking it)

H^) harry

--- BrightBoy <jdec at mindspring.com> wrote:

> All:
> 
> Here's an additional image of the "4H" photocoupler
> from the other side (you can see what looks to be
> the
> beginning of a "M" on the underside)
> 
> http://www.mindspring.com/~jdec/gtr/mystery2.jpg
> 
> Simply knowing what company produced these would be
> a great start to figuring out the mystery.
> 
> Cheers,
> 
> Jeff
> 
> -------- Original Message --------
> 
> All:
> 
> I'm in the process of reverse engineering the
> tri-stereo chorus
> rack unit and I'm wondering if anyone recognizes the
> two
> photocouplers that are used in this device:
> 
> http://www.mindspring.com/~jdec/gtr/mystery.jpg
> 
> The device with the "4G" marking has two leads on
> one end
> and 4 leads (2 pairs) on the other.
> 
> The device with the "4H" marking has two leads on
> each end.
> 
> Any help would be greatly appreciated!!!!
> 
> Cheers,
> 
> Jeff