piclist 2001\02\26\110930a >
Thread: DTMF Tx/Rx
www.piclist.com/techref/pots/dtmf.htm?key=dtmf
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face BY : David VanHorn email (remove spam text)



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

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.

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