Build 20W MOSFET Power Amplifier Circuit with IFR9520 IFR520
As we are like to show you about audio and sound circuit ,I found the circuit which is good one for power amplifier with one MOSFET. The output power of an operational amplifier is often increased by a complementary emiter follower. It can also be done with a MOSFET,but it is not a good idea to connect such a device as a complementary souce follower because the maximum output voltage of the opamp is then reduced appreciably by the gate-source control voltage of the MOSFET ,which can be a couple of volts. 20W MOSFET Power Amplifier Circuit with IFR9520,IFR520 20W power amp MOSFET Another approach is to connect two MOSFETs as a complementary drain follower.The (alternating) output current provided by the MOSFETs is limited by the level of the supply voltages and the saturateion voltages of T3 and T4 Resistor R8,together with R9,provides feedback for both the opamp and MOSFETs . The open-loop amplification of the opampis,therefore,increased by (1+R8/R9).the closed-loop amplification of th...