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Dear spleblem

The best way is using UM66 IC. It is very small and funny with just Three Leads. it is very similar to an ordinary transistor that
you may mistaken it with a transistor. It has three leads, two for Power and On for the Output. each IC has a unique code that represents the melody it has in its memory. U can test it by just connecting 3 Volts to the power leads and connect the output to your PC Line in without any extra hardware. Just do not forget to enable your Sound card Line In.

P.S. because the power is 2-3.5V you can run it by watch batteries. (BT66 is the same as UM66)

HTH - shariar

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