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Subject: ISD 1000A/ 2500A Voice Chip
Posted by: David Massengale
E-mail: dave(at)threehamsonrye(dot)com(no spam)
Is there anyone out there familiar with the ISD 1000A or 2500A series
voice record/playback chip? I am trying to design a circut that uses
this chip based on a Velleman kit, but I am confused between what ISD
says and the way the Kit was wired.
According to the ISD data, the PD (pull down) pin needs to be pulsed
from High (Vcc) to Low (Gnd) prior to recording or playback, but the
Velleman kit has it wired up through a resistor to Vcc, so it is
I just don't get it. I got the ISD data from www.isd.com in the
application notes section.
Any help on this would be appreciated.
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