A memory test for the Electronics Wizards

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Not at all, Murray ... You are very probably correct.

The specific device has an uncommon appearance, which is why I was hoping someone might recognise it visually.

The connections are all embedded in the resin block, but I believe that the relevant cable has three cores.

The wiring harness has a five pole connector with two cables ... Two thicker cores feeding the lamp, and three thinner ones apparently going to this device.

Photos later, I hope.

MichaelG.

I have probably half a dozen different opto sensors that have the same internal appearance (square sensor chip and one bond wire) but without being able to read the case marking would not know what each one was. I doubt very much that one could identify the part number of your device without reference to the original manufacturer.

Unless I missed it, you did not say why you were trying to identify it? If it is actually working then you could do you own tests with different light sources and generate some sort of response curve so that you could at least determine its operational purpose, my money would be on it being in a feedback loop with the lamp filament for constant illumination level

Ian P

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I must have led a very sheltered existence, Ian

This is the only one I recall seeing with the chip mounted diagonally to the tab, and with the seal so close to the window.

As for why ... idle curiosity

MichaelG.

The use of a photosensor used to be a sneaky way to implement a light sensitive 'anti-handling device' on a mine or a bomb, they have been around for a while **LINK**

So they make it just that bit harder to defuse if one wants to live to tell the tale to the grandchildren.

* Danny M *

With profound apologies for wasting everyone's time:

I have just taken the photos that I should have done yesterday ... and was surprised & embarrassed to find the clearly visible package marking BPX 61

I can only put it down to temporary insanity, brought-on by my bug-ridden condition.

Thanks all the comments and suggestions ... I will post the photos later.

MichaelG.

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http://docs-europe.electrocomponents.com/webdocs/08b4/0900766b808b4432.pdf

Edited By Michael Gilligan on 08/01/2018 12:53:53

O.K. ... Just to put this nonsense to bed.

1. General view of the business end; including the two lens attachments for off-axis fibre-optic lighting.

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2. The lamphouse for axial incident illumination.

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3.

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4. Showing the resin block

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5. Photocell port.

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6. Lamp, and photocell block

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7.

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8. Cable connector.

It now seems most likely that the transparent-sheath wire connects to a screen !!

MichaelG

Edited By Michael Gilligan on 08/01/2018 13:55:14

Thought So

**LINK**

Well at least the memory unit is still working!

Cheers
J

Perhaps it is used to tell you if the bulb has blown

Neil

Well I think it's just a plain old photo diode like this

**LINK**

and it can only be used in a feedback loop to set and regulate the level of illumination, I would have thought.

regards Martin

Closed loop brightness control?

Russell

Just said that Russel so I agree.

Martin

I had not thought about the chip to tab orientation as being a recognition point but have just looked at the three devices I can lay my hand on easily, and they all have the same chip orientation as yours. Its the exception that proves the rule

Ian P

... Its the exception that proves the rule

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I think the important rule, in this instance, was:

Don't post questions, or try to take explanatory photographs when non compos mentis

MichaelG.

Hi Michael,

I just came across this thread, and Im way late. But I actually have one those 2470 wedge bonders. The part you were asking about is a photodiode so the machine can tell how bright the light is. When running in automatic mode the different sections need different amounts of light and it used this diode to check that its output is consistent.

Mark,

Many thanks for the confirmation, regarding the machine's automatic mode.

... that makes good sense.

Nothing, however, can conceal my embarrasment about the original question

I was so pre-occupied with photographing the internal details that [looking via the camera] I failed to notice that the device was NOT potted flush, and that the markings WERE visible.

As mentioned in my post at the end of p1, I was suffering with the 'flu at the time and I really shouldn't have been playing, or asking dumb questions.

MichaelG.

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The Optem Zoom 65 was a whimsical ebay purchase, at a reasonable price.

... Anything relating to Photomacrography & Photomicrography attracts my interest.

I knew next to nothing about wedge bonding until I started investigating what I had bought.

If you happen to have any info about the lens, I would be grateful, as the UK distributors drew a complete blank [they still sell something similar, but the Zoom 65 is obsolete by a couple of generations, I believe]

MichaelG.