dss91
Junior Member level 2
hai here i have a peculiar problem
i have taken the dtmf output form mobile(nokia 2626)
what will be the voltage of the dtmf signal???
i hav kept a voltmeter at the mobile jack to measure the output voltage from jack
it reads zero?????
ok leave that ihav two wires from the head set one is a red one and other black one how should i connect them this is my first doubt
i hav connected the red wire from headset to pin2 and black to ground
and i hav dialed it and checked the pin stD for a logic high and i got nothing
even at the output pins i havnt got nothing
i hav attached my circuit verify it
i have taken the dtmf output form mobile(nokia 2626)
what will be the voltage of the dtmf signal???
i hav kept a voltmeter at the mobile jack to measure the output voltage from jack
it reads zero?????
ok leave that ihav two wires from the head set one is a red one and other black one how should i connect them this is my first doubt
i hav connected the red wire from headset to pin2 and black to ground
and i hav dialed it and checked the pin stD for a logic high and i got nothing
even at the output pins i havnt got nothing
i hav attached my circuit verify it