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oleoleo2 18th April 2011 08:05 AM

Impedance matching

I need some help with impedance matching!
I am designing an embedded unit, that has is supposed to have an output for external speaker/system. It should be matched so the impedance fits standard PC speakers (from what I could find it seems to be around 4 OhmsPc Speaker Impedance-Pc Speaker Impedance Manufacturers, Suppliers and Exporters on

The output comes from an MCU (LPC2132, this:

whitch makes PWM that goes into a buffer (this:, but I can change that if necessary).

How do I match the output impedance of the buffer so it fits the imput impedance of a standard PC speaker?

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