S say_hoe New Member Mar 7, 2003 #1 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.
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 Mar 7, 2003 #2 Pin7 is a DTMF output, produced two sinus freq. depending from button.If pressed 1 row1 and column1 freq. present on pin7. Attachments MT8870.jpg 43.1 KB · Views: 935
Pin7 is a DTMF output, produced two sinus freq. depending from button.If pressed 1 row1 and column1 freq. present on pin7.