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 09-13-2008, 11:40 Post: 156625
earthwrks

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 Need help identifying electronic component

I have a 12VC-110AC 2500W power convertor that recently fried some electronic components. All 8 items are the same size--about the size of dime, two conductors and soldered on the PC board. I removed them for indentification. A buddy tells me they look like a resistor, and have the resistor symbol printed on the board next to them. However, the letters preceeding the item no. (1-8) starts with TH-1 then the resistor symbol.

Anyone know what these are?

BTW in the same row of these of which these make up one-half, there is more similar but smaller components like them that did not fry.






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 09-13-2008, 12:44 Post: 156626
kwschumm



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 Need help identifying electronic component

Sound like capacitors to me. They are often disc shaped with radial leads (leads extending out the edges) and mounted on boards in a vertical orientation. Capacitors are rated in Farads (like pF, uF, etc). Any letters like that on 'em?






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 09-13-2008, 13:27 Post: 156629
earthwrks

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 Need help identifying electronic component

KW, it looks like ink-dot printing that says:
First line: (circle with some sort of symbol) NP
Second line: U or J or V, a line over E1 then larger 06.

It could be the two lines are actually two vertical columns in which case it would be:
First column: (circle with symbol), a small horizontal line, then U, J or V
Second column: NP, then 06

The fried ones flee apart to reveal what appears to be compressed carbon tablet that looks like an alnico magnet is made of--I guess. A conductor lead is attached to the front and to the back of the tablet. Then it is coated in the insulator. The whole thing is no more than an 1/8" thick.

Any idea what the "TH-x" and the resistor symbol have to do with it? According to my buddy who looked at it, he says there 8 switching transistors in row parallel and next to these what-ever-they-ares.






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 09-13-2008, 15:08 Post: 156632
kwschumm



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 Need help identifying electronic component

I'm not a EE and don't specify these sorts of parts but here's my best guess, which may well be totally wrong.

circle and NP may be manufacturer

it has a J which usually means Joules which might mean it's an energy device, my guess is a varistor.

The E1 and 06 may be a date code, with 06 the year.

TH-x is probably the series.

Seems there should be more numbers (voltage rating at least)

By resistor symbol do you mean the Greek Omega character?






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 09-13-2008, 16:31 Post: 156636
earthwrks

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 Need help identifying electronic component

It was bought in early '05 so '06 ain't right as a date code Smile

The TH thing: Picture an assembler looking at the PC board and it shows printed on the board TH 1, TH 2, TH 3 and so on. Next to each TH (No.) appears the resistor symbol inside a rectangle: -/////-






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 09-13-2008, 16:39 Post: 156637
earthwrks

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 Need help identifying electronic component

The resistor picture I'll try again -VVVVV- in other words a zig-zag line in a rectangular box.






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 09-13-2008, 17:11 Post: 156638
kwschumm



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 Need help identifying electronic component

Ah, the TH is on the PC board and not the fried part? They are very likely thermistors. They are often used in power related devices as inrush current limiters.






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 09-13-2008, 18:12 Post: 156640
earthwrks

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 Need help identifying electronic component

Sounds good to me, makes sense. Where would I go to get something like them without knowing the values?






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 09-13-2008, 18:21 Post: 156641
kwschumm



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 Need help identifying electronic component

A good place to get them is digikey.com. If they are on the side of the circuit where the AC power comes in they are probably 120V and tolerance is probably not critical. Other than that... well, I'm no EE. Good luck.






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 09-13-2008, 19:28 Post: 156645
earthwrks

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 Need help identifying electronic component

Okay, but this unit takes 12 volts and makes 110 AC, so does that change things?






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Discussion Boards > Active Subjects > Messages as Posted > Just For Fun Off Topic Forum

Thread 156625 Filter by Poster:
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