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Compare RC coupled, transformer coupled and direct coupled amplifier based on four points.

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Parameter
RC coupled
Transformer coupled
Direct coupled 
Coupling element
Resistor and capacitor
Transformer
No element
Impedance matching
Poor
Excellent
good
Frequency response
Excellent at audio frequency
Poor
good
Amplify
AC only
AC only
AC as well DC 
Application
Voltage/Audio amplifier
Power amplifier
Low frequency amplifier,opamp
Size and cost
small
Large and bulky
least

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