100 watt DC servo amplifier by Power MOSFET

This circuit is a MOSFET power amplifier configured in an OCL (Output Capacitor-Less) topology. It delivers an output power of 100 watts and can utilize MOSFETs such as K134 and J49 or J162 and K1058. When driving an 8-ohm speaker, the circuit can achieve an output of 112 watts. The power supply requirements are ±56V with a current rating of 4A.

The MOSFET power amplifier circuit employs an OCL configuration, which eliminates the need for output coupling capacitors, thereby improving low-frequency response and overall efficiency. The choice of MOSFETs, such as the K134 and J49 or the J162 and K1058, is critical for achieving the desired power output and fidelity. These MOSFETs are selected for their high gain and low on-resistance characteristics, which contribute to the amplifier's performance.

The circuit typically consists of a differential input stage, which amplifies the audio signal, followed by a voltage gain stage that drives the output stage. The output stage is composed of complementary MOSFET pairs that allow for efficient push-pull operation, minimizing distortion and maximizing power output. The amplifier is designed to operate with a power supply of ±56V, which provides sufficient headroom for dynamic audio signals while ensuring that the output stage can deliver peak power without clipping.

In addition to the MOSFETs, the circuit may include biasing networks, feedback loops, and protection mechanisms to ensure stable operation under varying load conditions. Proper heat dissipation measures, such as heat sinks, are also essential to prevent thermal runaway and ensure reliable long-term performance.

Overall, this MOSFET power amplifier circuit is suitable for high-fidelity audio applications, providing robust power output and excellent sound quality when driving 8-ohm speakers.This is circuit MOSFET power amplifier OCL, Output 100w , use mosfet k134+j49 or Mosfet J162 + K1058, Output 112W at Speaker 8 OHM. Power Supply +56V/-56V 4A.. 🔗 External reference