Electronics > Projects, Designs, and Technical Stuff
Mystery tin resistor box
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enut11:
@Ian.M
The sketches were uploaded due to a query from another member and they do help somewhat. I will also look into your spreadsheet idea.

Some more pix attached showing the box is solder-sealed.

Box weighs 97g and size is 9 x 3.5 x 3.5cm

Noise? sounds like a click

CG is approx central on all planes.

There are no diodes in the box
Gyro:
It looks as if that box has already been opened - there is no continuous solder fillet (unless it is just the photo angle), maybe just tack-soldered in a few places.
Ian.M:
The weight means its unlikely to contain a transformer or to be potted.

As Gyro points out, that looks like it could be desoldered reasonably easily using a high enough wattage soldering iron.  Remove as much solder as possible using solder-wick, then work round it prying the joint open slightly while heating it, so residual solder doesn't bridge across the joint.  It will  probably remain in contact at the corners so you'll have to clamp it in a vice and work round reheating them and prying between the top of the vice jaws and the edge of the lid to gain a small movement at each corner in turn till the lid comes off.

Opening it will probably be less tedious than taking a full matrix of measurements (aka: the spreadsheet), and you'll also gain a reusable screening box, and if you are lucky some  precision resistors.
M4trix:
Well, you could end the debate by grabbing a hacksaw and....  :popcorn:
Ian.M:
I would only take a hacksaw to it as a last resort as the enclosure is probably of greater use than the contents.   If its too difficult to get the lid off by ordinary desoldering, it would be less destructive to slit the corners of the lid with a Dremel cutting disk so the lid sides can be bent out slightly to ease desoldering them.   It could still be reconstructed if anyone has need of it, with the corner slits filled with solder, wiped to original profile.
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