Addendum: 8bit is of course a bit optimistic for R2R, so maybe I will
just use a chip with built-in DAC.
Am 09.09.2014 22:48, schrieb jb-electronics:
Hello John, thanks for your detailed input. And Jon, yes, you were
quite prophetic. Eerie...
So I can set the output voltage with PWM, that is convenient. I don't
know enough about switch mode power supply feedback loops to
understand why it works like that exactly, though, but for now I will
take it. Thanks for your spreadsheet!
I will probably build an 8bit R2R network and use a shift register to
create a small DAC that way.
Now that I have you here, can you answer me another question? I was
wondering if the circuitry couldbe tweaked as to allow a maximum
output voltage of 250V or even 300V. I will only need a maximum
current of 10mA since I want to build a testing stand for single Nixie
tubes.
Jens
Am 09.09.2014 20:43, schrieb taylorjpt:
You can also build your own DAC with an R2R network controlled by
GPIOs that will give you a linear Radj = Vout voltage vs binary
code. You can buy R2R ladders off the shelf:
http://www.digikey.com/product-detail/en/4610X-R2R-103LF/4610X-R2R-103LF-ND/3787967
jt
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