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output of UM91214B

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say_hoe

New Member
Do anyone know the output waveform of UM91214B(pin 7)?I need the output waveform for 1,2,4 and 8 when the respective column and row are short circuited.

Thank you.
 

Sebi

Active Member
Pin7 is a DTMF output, produced two sinus freq. depending from button.If pressed 1 row1 and column1 freq. present on pin7.
 

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