i am doing a project to convert an input signal (audio) into digital and then converted back to analog and hear it via speaker.
i am using this website as my reference.
in step 4, there is external electronic circuit. in the amplifier stage, there is Vcc connected to positive of the battery. and GND is connected to the negative of another battery.
to baes an amplifier, i should connect vcc to + and vdd to - not to the GND.
my question here is , the negative of the battery is it connected to GND or vdd?
In that circuit there's a very suspicious looking 47nF capacitor to ground that seems
very large for a TL0XX opamp to drive directly. I'd add a 330 ohm resistor between
the output of the opamp and the 10uF blocking cap to give a real LPF stage (roll
off about 10kHz with the 47nF).
In general instructables are crap, try some place else.
i used the same circuit on instructables website. i connected the DC offset circuit to 3.3v not as it shown in the web because i am using Due board (max input 3.3v). the due board got overheated then blow up.
could someone provide me with a reliable circuit ,