Hi all,

I want to detect the presence of audio signal in a line. I will use =
16F628 and I am interested in minimising the external hardware (avoid =
operational amplifiers)

The typical audio signal is 0.03 V rms.
1.- can I use a Vref (external, cause the minimum internal one is =
5/24=3D0.2 V) as amall as 0.02 V?

2.- And more interesting, Can I use the output of the comparator (pin =
RA4, mode 010) to feedback the internal operational amplifier with a =
resistor so that a gain is obtained?

Thank you in advance for your answers!

------------
Jes=FAs Gonzalo
Ingenier=EDa y Servicioc Aeroespaciales, SA.
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