Your reference at the inverting input of the second amp has to match the average voltage of the waveform coming from the first amp.
it doesn't work...
the first opamp is an active filter, to make some filtering on the received signal from the antenna. This stage works fine.
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yesThe dc bias voltage at the non-inv. input is zero (ground), right?
The dc bias voltage at the inv. input is finite and unknown since the dc output is undefined.
Thus, the opamp does not work in its linear region.
Did you measure the dc output?
Perhaps the presented drawing does not reflect the real circuit?
yes
However, I've tried the circuit with dual supply and it works fine... I think I'll keep this version..
Anyway I'd like to learn how to identify the correct bias to apply to the inverting input...
thanks
Isn't this the only way to do a non-inverting amplifier?But why do you prefer to bias the inverting input?
Isn't this the only way to do a non-inverting amplifier?
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