Electronics > Projects, Designs, and Technical Stuff

Mystery tin resistor box

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enut11:

--- Quote from: coromonadalix on May 23, 2020, 10:37:52 am ---Maybe a resistor network for some instrument ... like a frequency generator ?

Can you shoot some photos  from the bottom, is it completly sealed off ?

Stranges values indeed

--- End quote ---

It is completely sealed.

More resistance checks, this time referenced to pin #1.
2:  3809 ohms
3:  809 ohms
4:  809 ohms
5:  804 ohms
6:  804 ohms
7:  521 ohms
8: 3810 ohms
9:  3808 ohms
10:  521 ohms
11:  877 ohms
12:  806 ohms
13:  877 ohms

None are connected to the metal can.

ratio:
Draw a picture looking down from above, measure the resistance between all of the terminals that had wires connected, & show them on the pic.
Also, do you have a CLR meter of some kind?

enut11:
I have a simple CR/Trans tester.

The picture below shows the resistances that I measured between the previously soldered terminals. This is part 1 as interaction between upper and lower rows is not shown here but will be in a follow-up.

enut11:
This is the second part - Resistance measurements between the upper and lower rows.

Actually, I am not sure if these diagrams help. Just a rats-nest of resistances.

Ian.M:
Don't do a diagram, do a spreadsheet.   Terminal numbers as (text) column headers and row values, then a grid of measurements at each row/column intersection.  Obviously the diagonal where row=column will be blank.  Enter shorts as 0 and leave opens blank.
Always put the positive probe on the row label terminal so the results will meaningfully show the presence of any diode junctions, i.e if resistance(col,row)<>resistance(row,col)

Also, *HOW* is the box sealed?  some good photos of the sides may lead to suggestions for opening it non-destructively.   
What does it weigh, and what are its dimensions?
What does it sound like if you tap it with a hard object?  e.g. does it click, clank or ring.
Estimate where its center of gravity (C.G.) is by rolling it across a round toothpick, and marking the position of the toothpick when it tips.  Do this in both directions across a long side, and both directions across the base.

If its heavy and the C.G. is fairly central, perhaps biased a bit towards the base, it would make gbaddeley's transformer suggestion more likely.

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