[sdiy] Mystery Vactrols/Photocouplers

[Harry Bissell Jr]

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
> 
> 
> 
>