Hi:
I’m building a little single channel MIDI to CV that uses a DAC0831
(actually I going to use a DAC0832 because is cheaper to do the test).
It uses a REF01 as a voltage reference, but I can’t find it in my country.
I can’t find MAX672 and MAX674 either (this two are replacements of
the REF01).
Anybody knows of another replacement, easy to find. Or can I make
a discrete voltage reference (10V) for the DAC0831/2?
Thank you.
You can probably build your own voltage reference without too much difficulty. Build a voltage divider (out of two resistors) between your regulated +12V and GND. Feed the divided voltage into some opamp, it shouldn’t really matter which one. Since you want this to be really precise, you may want to add a trimmer potentiometer into your divider so that you can tune it precisely to +10V. After everything has warmed up and you’ve tuned the output of the opamp to +10V, you should be able to feed that to your DAC (I think).
A project I’m working on right now uses this approach (a pair of 10k resistors and an LM358) to create a +2.5V reference between +5V and GND.
Hi:
Thanks for the reply.
I found on the net a lot of replacements for REF01, but I can’t found
them in the local stores.
I’m going to use a TL431 with a few resistors. The TL431 works as
a variable voltage reference, and is temp compensated.