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MannLab5

1) This chip amplifies an audio signal.

http://pdf1.alldatasheet.com/datasheet-pdf/view/8888/NSC/LM386M-1.html

Manufacturer: national Semiconductor

Part Number: LM386M-1

2) This chip records and plays back a voice message (or other sounds).

http://www.nuvoton-usa.com/hq/enu/ProductAndSales/ProductLines/ConsumerElectronicsIC/ISDVoiceIC/ISDChipCorder/ISD1700.htm

Manufacturer: Nuvoton

Part Number: ISD-17240

3) THis chip allows you to create an electronic touch sensor.

http://pdf1.alldatasheet.com/datasheet-pdf/view/164270/QUANTUM/QT1106.html

Manufacturer: Quantum

Part Number: QT1106

For my group's ATDF project, we should consider using a pre-recorded voice chip from this site...http://talkingproducts.co.uk/