fareezaw
Newbie level 1
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Simple DAC op amp testing circuit
Dear all
First I want to thank you all for this site.
I tried to assemble simple DAC in the attached pic.
https://obrazki.elektroda.pl/31_1319960218.jpg
that I took it from this page:
**broken link removed**
but the results are wrong ,
the equation for it : Vout=-(v1in+v2in/2+v3in/4) , so
do I need to use negative voltages for digital inputs to get that result ?
because I used the TTL output as inputs and they wrote negative voltage in the output (111 will give -7v )
or is there other thing ?.
thanks a lot and best regards
Fareez
Dear all
First I want to thank you all for this site.
I tried to assemble simple DAC in the attached pic.
https://obrazki.elektroda.pl/31_1319960218.jpg
that I took it from this page:
**broken link removed**
but the results are wrong ,
the equation for it : Vout=-(v1in+v2in/2+v3in/4) , so
do I need to use negative voltages for digital inputs to get that result ?
because I used the TTL output as inputs and they wrote negative voltage in the output (111 will give -7v )
or is there other thing ?.
thanks a lot and best regards
Fareez
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