![]() ![]() The emitter bypass capacitor C E is meant for R E to prevent ac voltage. In a power amplifier circuit shown R 1 and R 2 provide potential divider biasing and emitter resistor R E is meant for bias stabilization. ![]() This arrangement also permits impedance matching. Hence, it is generally inadvisable to pass t he current through the output device such as in a voice coil of a loudspeaker.įor these reasons an arrangement using a suitable transformer for coupling the load to the amplifier is usually employed, as shown above. As a result this dc power dissipated in the load resistor does not contribute to the useful ac output power. In case of a direct-coupled class A power am plifier as shown above, the current flows through the collector resistive load causes large wastage of dc power in it.
0 Comments
Leave a Reply. |