[sdiy] ADc & DAC voltage dividers.. fixed resistors values finally..

[Jean-Pierre Desrochers]

Here is a revised version of the ADC/DAC circuits according (I think)
to what has been suggested and pointed out such as:

ADC’s Input bias current vs driving opamp’s output impedance

Resulting in pour linearity of incoming CVs,

LPF bad results on ADC readings (R1 and former C1 removed cap ).
BTW, +5v reference will be from a REF02  0.2% precision
and as shown will drive both ADC/DAC.
OP275 seems to be a good choice for driving the ADC
but I hope more buffering 2 chained opamps won’t bring too much offset voltage
to AIN input here..

 

 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20210215/d6086596/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 57316 bytes
Desc: not available
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20210215/d6086596/attachment.jpg>