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Subject: ISD 1000A/ 2500A Voice Chip

Date: 08/23/99
Posted by: David Massengale
E-mail: dave(at)threehamsonrye(dot)com(no spam)
URL: http://www.threehamsonrye.com

Message:

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 always high. 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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