Re: DIY R-2R DAC: πειρασμός, όχι αστεία...
Αυτά είναι τα καλύτερα νέα. Τώρα χαλαρώνεις και απολαμβάνεις.. :smile:
Δεν νομίζω!!!!
Σε λίγο θα έρθει το καινούργιο firmware....
Και πριν λίγες ώρες ανακοινώθηκε η επίσημη τροποποίηση by Soekris που θα αναδείξει τι σημαίνει R2R !!!!!
"Okay, here is the official recommendation for vref buffer circuit, after I spend some time simulating and real hardware testing. The original circuit was ok, I didn't spend that much time on it originally as things seems to work fine. But yes, there is room for improvements there...
The output capacitors, marked with red, can be paralleled as much as wanted, but a single 47uF X5R 0603 capacitor is really enough and will fit nicely.
The output series resistors need to be much lower, I recommend to parallel the existing one, marked with blue, with a 0.1 ohm 0603 resistor.
The feedback need to be moved to before the output resistor, by paralleling the feedback capacitor, marked with orange, with a low ohm resistors, t.ex. 0.1 ohm 0603.
I strongly recommend to parallel additional parts instead of removing parts as there then is much less chance of damaging anything.
These modification will result in less than 1 mV p-p ripple, at all frequencies, with no peaking or changes in voltage precision. It's also what the next production series will look like."
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