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18th April 2011, 07:05 AM
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diyAudio Member
Join Date: Aug 2008
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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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