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DMMCheck Plus Multimeter Reference(and other References) - Experiences..

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KungFuJosh:

--- Quote from: Martin72 on July 15, 2023, 07:54:48 pm ---Several ICs are not avaible before 2024 and then they cost..not less.

--- End quote ---

What chips aren't available on the BOM? I haven't signed up yet, but I probably will. That looks like an interesting project.

I'll be ordering extra PCBs of mine too, since it costs less to buy more. 🙄

Martin72:
Here the BOM of the reference itself and of the (additional) heater...Minimum 2 of the AD... OP-Amps are missed (Farnell)
In principle, you could still "tune" it to 1ppm, but that's another story.
You know there´s a 5pcs minimum order so I could send you a pcb, but I think, the shipping costs will be more expensive as if you order them directly.. ;D
Edit: Threadtitle changed..

KungFuJosh:
I can't look through the whole BOMs right now, what specifically can't yet get? There's very likely plenty of substitutes.

For example, IH0515SH replace with: PEM2-S5-S15-S

Martin72:
AD8676, AD5791 (expensive), AD8675, the rest I didn´t looked for.
Nevertheless, not a cheap project. When I decide to start with it, I´ll make a new thread for it.
One the cheapest parts would be the pcb... 8)

KungFuJosh:

--- Quote from: Martin72 on July 15, 2023, 08:58:34 pm ---AD8676, AD5791 (expensive), AD8675, the rest I didn´t looked for.
Nevertheless, not a cheap project. When I decide to start with it, I´ll make a new thread for it.
One the cheapest parts would be the pcb... 8)

--- End quote ---

Yikes! The AD5791s in stock are $327 USD. The $85 version is next year, but the $135 version might be as soon as September. Any of those options are pretty expensive for a single chip on a test board.

The other two have SMD versions available for $4 to $7. Start the thread anyway. 😉

 

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