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super expensive DIY voltage refference.
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author super expensive DIY voltage refference.
EATyourGUITAR
if anyone needs a voltage reference that can do 7.xxxxxxV accuracy here is all the schematics and info you need

https://xdevs.com/article/kx-ref/

to test your reference, you will need a $3000 volt meter with 7-1/2 digit resolution. or you can visit a calibration laboratory. maybe your local university can help you. what you get from this is anything between 7.1V up to 7.5v. it is completely random what you will get but it will stay the same for life of your individual sample provided you follow the 1 year burn in procedure.

devinw1
Sounds like a plan! lol
guest
whooa, wait a second here. the LTZ1000 is a heated matched pair, as best i can tell. has anyone used one as an expo converter? granted, its 60$, but maybe someone finds it worth it? thanks for posting that.
Orgia Mode
wooooow digits for days.
megaohm
The BOM for that lists raw parts cost as $300+.
It's a special thing so not terrible.

There is also a low cost, less precise version using two LM339.
They have an OSH Park pcb file to use for that one, too.

Thanks for posting this. Enjoying the read.
emmaker
That's not to bad. One of the calibration generators I had to use on one of my jobs cost $250K with 5 test heads.

Another job to test and qualify the product there was a 2 rack system (by rack here I mean 6' instrumentation rack) that I was told cost $1.5M. It was filled with gear from Tektronix, Keithley and Agilent/Keysight.
elektrouwe
guest wrote:
whooa, wait a second here. the LTZ1000 is a heated matched pair, as best i can tell...

well, 60..70$ for an expo is a lot of money compared to a 60..70cent LM13700, who can do this too. But whooa, wait a second here ;-) can't we use a LM13700 as heated precision zener ? Darlingtons as heaters & Iabc mirror (see expoOTA) as temp sensor and reverse breakdown lin. diodes as zeners ? probably find some time next week to check this...
neil.johnson
What a complete waste of time. Buy a calibrated 10v source for $75.00 ($89.50 if you want it in a box) and get on with building synths!

http://www.voltagestandard.com

Neil
revtor
Love the pcb layout on they thing... the art of the science of the layout..
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