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Re: Datasheet Sites
There's an overwhelming amount of component data available from distributors such as www.farnell.com Nearly anything that you may be looking for is available. For HF stuff you may consider Richardson,
Hans
Re: DTMF CHECK
You need to feed it two sinewave frequencies, one from the lower group and one from the upper group of 4 frequencies simultaneously and verify the correct 4-bit result at the digital decoded output of the chip. Depending on the chip type, you may need to take the 2 dB +/- 1 dB...
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