Electronics > Circuit Studio

Example Project: Relay scan card for K2000 DMM

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skander36:
Still available on Aliexpress site but for sure they are not originals.

https://www.aliexpress.com/item/1005003218317238.html?spm=a2g0o.productlist.0.0.126e4942zNMmoP&algo_pvid=9c6760a0-be03-4701-8e11-65ff7f5a2ff6&algo_exp_id=9c6760a0-be03-4701-8e11-65ff7f5a2ff6-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000024709708550%22%7D&pdp_npi=2%40dis%21EUR%211.4%211.22%21%21%21%21%21%402103255a16680776072986821e4c05%2112000024709708550%21sea&curPageLogUid=KqMJAp3KxQpu

voltsandjolts:
Yeh, those AliExpress MIC5841BN would probably do the job, assuming there is some silicon inside the DIP package ;D

gmac34:
Hi, I made an alternative layout that supports the SOIC-18 versions of MIC5841YWM, I have not made a board yet, so there might be errors, I don have much layout experience...
I'm not sure when I will test a prototype as I want to check first if I can replicate the 2001-TCSCAN and manage to use thermocouples, the AD590MH Temperature Sensor is quite expensive so I want to look for alternatives. has anyone thought about doing that?

anyway for now I leave my export here if anyone wants to try

voltsandjolts:
Cool, and in KiCAD, thanks for posting.

The 2001-TCSCAN is a bit of a nuisance because you (ideally) need the isothermal block for the cold junction, but surely it's doable.
I just use 4-wire RTDs with a standard scan card.

gmac34:
It seems difficult to match the performance of the original 2001-TCSCAN without spending almost as much as a used card
but I think I will try to make a layout with an AD590KRZ (lower specs SOIC-8 version of the sensors) that goes for around 20€ and place it under the binding posts on the bottom of the board on a nice ground plane full of stitching vias, I would think that would be enough to use at least the two neighboring posts.

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