A memory test for the Electronics Wizards

[Michael GilliganParticipant @michaelgilligan61133]

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

[Michael GilliganParticipant @michaelgilligan61133]

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

[John McNamaraParticipant @johnmcnamara74883]

Thought So

**LINK**

Well at least the memory unit is still working!

Cheers
J

[Neil WyattModerator @neilwyatt]

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

Neil

[Martin KyteParticipant @martinkyte99762]

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

[Russell EberhardtParticipant @russelleberhardt48058]

Closed loop brightness control?

Russell

[Martin KyteParticipant @martinkyte99762]

Just said that Russel so I agree.

Martin

[Ian PParticipant @ianp]

Posted by Michael Gilligan on 08/01/2018 11:18:40:

Posted by Ian P on 08/01/2018 10:57:37:

I have probably half a dozen different opto sensors that have the same internal appearance (square sensor chip and one bond wire) …

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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.

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

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Ian P on 08/01/2018 15:33:15:

… 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.

[Mark WhelanParticipant @markwhelan39130]

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.

[Michael GilliganParticipant @michaelgilligan61133]

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.

[Mark WhelanParticipant @markwhelan39130]

No problem at all. Funny to come across the part out in the wild. How did you end up with it?

Also, funny to note, the diode in it has been ball bonded, not wedge bonded.
Might only be funny to me

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Mark Whelan on 18/07/2018 21:40:37:

No problem at all. Funny to come across the part out in the wild. How did you end up with it?

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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.

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