Need help identifying and locating DIP-packaged trimpot resistor

Mar 23, 2017 11 Replies

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groink1 9 years ago

Aloha!

I'm reverse engineering an early 1980s era PCB. On the board is this DIP-packaged trimpot resistor. Its dimensions is typical of a 14-pin 74-series package.

The part consists of three 10K ohm trimpot resistors. From the schematic diagram (package is labeled MP1,) the three groups are:

trimpot 1 - pins 2, 13, 14 trimpot 2 - pins 6, 9, 10 trimpot 3 - pins 4, 11, 12

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I've been searching all over Google for this part. The part has no identifying marks. I'd like to buy a bunch of these.

Thanks!

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Phil Allison 9 years ago

** It would be simple enough to make your own. Just three mini 10k trimpots and a 14 pin DIL header.

Plus some offcuts of resistor lead and a few minutes with a fine tip iron.

.... Phil

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groink1 9 years ago

Yup, if all else fails, I'll probably end up doing this.

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George Herold 9 years ago

The images make it look a bit "home grown" to begin with.

to the OP, Why not just use three trim pots? What's the advantage of having them in a DIP?

George H.

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Tim Wescott 9 years ago

That does look kinda crude -- Russian or older Chinese, maybe? Or crafted in someone's garage.

Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!

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Tom Biasi 9 years ago

Poke around here:

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groink1 9 years ago

Trying to keep the "look" of this project as original as possible.

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groink1 9 years ago

Bingo!!! That's it!! I actually "tried" to go to this site, but my workplace firewall blocked it. I would've saved a lot of time if I pursued this site further.

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Tim Wescott 9 years ago

Get square trim pots and group them in threes, call it good?

Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!

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George Herold 9 years ago

OK if that's important, then as Phil said, fab your own. (It seems silly to me to add cost to your customer for look, though I also agree that look is important. You should multiple your cost by ~3. (or pi :^) how much is the dip pack worth? vs three trim pots in a row on pcb.

George H.

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Tom Biasi 9 years ago

Your second picture clearly shows 7103C

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groink1 9 years ago

I actually didn't see that. I should've looked at the photos. I really need a magnifying glass.

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