In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

The VOX circuit that Sparks mentioned is essentially an amplifier, a rectifier/filter, and a transistor switch that's intended to connect to a microphone level input.  Your sound card probably has a line level output (maybe 1V max) or a headphone output.  In both cases, you will need less amplification.  You may just need the diode and filter capacitor.  It all depends on the output circuitry of your sound card.

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