piclist 2001\02\26\110930a >
Thread: DTMF Tx/Rx
face BY : David VanHorn email (remove spam text)

>Is there any way to know if the signal is too weak? What is meant by

Relative amplitude between the low and high tones.
You need a spectrum analyzer to see that.

>The signal at the transformer secondary has an amplitude of around 40 mV
>peak. Is this considered fine?

Should be ok, you need to check the chip spec though.

Dave's Engineering Page: http://www.dvanhorn.org
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