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Old 18th April 2011, 08:05 AM   #1
diyAudio Member
 
Join Date: Aug 2008
Default Impedance matching

Hello.

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 Alibaba.com)

The output comes from an MCU (LPC2132, this: http://www.keil.com/dd/docs/datashts...2_34_36_38.pdf)

whitch makes PWM that goes into a buffer (this: http://www.nxp.com/documents/data_sheet/74LVC1G34.pdf, 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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