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Subject: Re: require datasheets of 91214B and 8870 DTMF generator and decoder

Date: 05/18/03 at 1:41 AM
Posted by: MUHAMMED IFTHIKHAR CK
E-mail: mifthickzee@yahoo.co.uk
Message Posted:

In Reply to: require datasheets of 91214B and 8870 DTMF generator and decoder posted by shashi kant on 06/15/02 at 11:43 AM:

I require datasheets of 91214b and CM8870 DTMF DECODER
ALREADY I EXPERIMENTED WITH "UM91214B & A
BY USING MATRIX KEY BOARD AND OSCILLOSCOPE... BUT
I AM NOT GETTING ANY WAVEFORMS ON THE SCOPE WHAT I SHOULD DO... I FOLLOWED A CIRCUT DIAGRAM FROM
A POPULAR ELECTRONICS journal.I think ther is no problem with keyboard which i used for my testing


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