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For those who are interested: Radio Shack has apparently discontinued the ISD chips--several stores don't show them in their computers and the website, same. I have been able to locate only the 2.6 kHz bandwidth 10 second chips (ISD 1110), and these only at digikey.com--if you're looking to fool around with this stuff, it might be wise to order a few. I ordered 10 for $36. It may be that the company has gone south, I don't know. If they reappear, I think that the longer times/greater bandwidth versions will probably pop right into any 1110 designs we might come up with... David Lee Myers http://www.pulsewidth.com