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piezo screamer circuit

Discussion in 'Electronic Design' started by [email protected], May 1, 2007.

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  1. Guest

    I am working on building a piezo screamer myself. I have found
    multiple circuits on the web, but all of them have dozens of parts.

    I disassembled one from Radio shack and found about 4 total parts.
    These units have an 8 pin chip with CIR8821C written on it and a three
    pin transformer to boost the piezo. How would I find out what these
    part are? A web search yielded nothing.

    I would like to trim my parts down and find the magic spot on the web
    that sells these chips.

    Any help would be appreciated..

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