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    Sequential Logic Problem

    Hi, I'm trying to figure out a circuit that would sequentially "scroll" through one of three audio inputs, and the logic is kicking my keister. Is there a cookbook approach to this, or possibly a chip that already does this? Thanks in advance.
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    Soft Power Up?

    I've built a small transistor-based preamp and powered it with a standard 9v battery. Its using a SPST switch to which the ground is hooked to turn it on. The problem is that there is a substantial thump when the switch is thrown, and I'm looking for a solution with a small component count that...
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