It doesn't work 😞.
Would some kind soul show me the errors of my ways, or supply a link to a proven circuit that works?
I would be very grateful and will write you in my will for your efforts! (..Although I will probably die in deep debt so maybe that's not such a great reward).
Thanking you,
Marco
Don't the capacitors on input and output block DC? Normally that would be used for AC coupling.
Adam
On 08/08/17 15:54, Marco Bresciani wrote:
> Hi there,
>
> I have made an Op Amp Circuit powered by a single supply voltage (battery) that is supposed to detect the presence of a low negative DC voltage by amplifying and inverting it so a 3.3v microcontroller can measure it via an ADC pin. I don't need to know the exact value, I just need to tell the difference between 0v and a negative voltage anywhere in the range of -5mV to -50mV.
>
> <https://lh3.googleusercontent.com/-E5aoIfVhBPI/WYlONVu7e3I/AAAAAAAAAtM/x1LEA39D-9EjOkma92Zg__uRRkfGgcE1gCLcBGAs/s1600/OpAmpCircuit.png>
>
>
> It doesn't work 😞.
>
>
> Would some kind soul show me the errors of my ways, or supply a link to a proven circuit that works?
>
>
> I would be very grateful and will write you in my will for your efforts! (..Although I will probably die in deep debt so maybe that's not such a great reward).
>
>
> Thanking you,
>
> Marco
>
>
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Am I using the virtual ground correctly?