Photodiode in a tube

On a sunny day (Tue, 29 Oct 2013 09:05:51 -0700) it happened John Larkin wrote in :

What is the round hole next to the ethernet connector for?

That will have a PEM-like threaded insert for a screw, securing the tube into a structure. It will be a swaged thing, since the metal is too thin for a proper PEM insert.

Agreed.

A square photodiode and square connector sorta suggest that a rectangular can might be more appropriate. A rectangular can should give you room for two PCB's and more volume if necessary.

Looks nice, Say where do you get your photodiodes? We buy something that looks similar from Opto-electronics.. but they are spendy. (Pin-3cd ~$8.00 pin-44D ~$20.00 pin-6d... I've got these in my box but can't find what we paid for them.)

George H.

The customer wants a round tube. Actually, it looks like things will fit. I'll post pics of the real thing when it's done.

I don't want to talk details about the electronics. NDAs and all that. But the photodiode isn't cheap. It's going to cost more than the enclosure.

I just thought the packaging looked cool. I think we'll gold plate the outside surface of the round board to make it look cooler.

Is gold alodine illegal now? That would look nice on the aluminum can, but may involve cadmium.

Very nice mockup.

It's still available, with modified processes. Chromate finish is used a lot on aircraft stuff. You don't like plain old anodize?

I'd rather keep everything conductive. That RJ, for example, has spring fingers that ground it to the hole. Alodine is cheaper, too.

Very nice. Looks like it could fit in a telescope eyepiece.

Den tirsdag den 29. oktober 2013 17.39.07 UTC+1 skrev John Larkin:

maybe something like this:

-Lasse

Jan Panteltje used his keyboard to write :

A standard PEM will pull out. The tube length is a great lever arm: vibration, etc will do it.

--- news://freenews.netfront.net/ - complaints: snipped-for-privacy@netfront.net ---

Those would be really cool, for attaching the internal PCB to the can. We wanted to use them but they're too big.

The swage thing is used for the screw that attaches the can to a structure:

Den tirsdag den 29. oktober 2013 22.32.10 UTC+1 skrev John Larkin:

With that soldered to the pcb you would only need a hole in the can With the nut flush against the inside of the can it wouldn't be the pcb that takes any force it just holds the nut in place

-Lasse

I think the dimensions didn't work out for that. The RJ45 connector is hogging all the space where that PEM would sit. The swage thing is nice, less potential PCB stress if the PEM weren't exactly vertical, no force on the board if some tech scrunches the screw down.

But I'm just the circuit designer. My mechanical guy worked out all the gory 3D details.