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/diy/ - Do-It-Yourself


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>> No.2039180 [View]
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the ref pin is "just" another input to the in amp, but one that isn't multiplied by the amp's set gain. what you're describing is like the offset-null pins of early op amps, back before laser trimming was cheap and easy

you will need a hell of a power supply
just 1 Form C? that sounds rough. some 2 Form C contact units would help with RAM and math and multiplexing
so at bare minimum you'd need 30 nybbles for 10 digits each of result, input accumulator, and one scratchpad (mul/div), and a handful of small scratchpad registers and counter registers which you'd have to get a bit further into the design to quantify
>DIP switches for ROM
better: plug diodes into a matrix of pin sockets. you'll need the diodes on the switches anyway to keep 1-bits from backfeeding through other switches. diodes will be happier at lower current therefore higher voltage is preferred
I would try to make certain tasks as hardware-driven as possible, and reserve the program store for cycling through the big number arrays, normalizing results, etc. maybe the entire process of inputting a stream of digits into a storage register could be handled without CPU intervention. halt-until-event processor instructions were pretty common in mechanical calculators as an implementation technique, in discrete CPUs on mainframes and minicomputers as a cost-saving and virtualization-assisting measure, and in portable devices today as a power-saving measure. the whole project would look less like the sort of general-purpose processor we're used to, but it would be a lot quieter at idle

you need a cookbook. look up "op amp cookbook" and you'll find a Nuts & Volts article series, a book published by Sams, and a TI app note, among many others. then go to the roll page in the OP and get an application to assemble them in

it's so the internals of the inamp don't distort the intended ref voltage

I meant the high end OF UNI-T, ~equivalent to mid-low Fluke

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