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