| 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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