High power mosfet amplifier circuit ideas

The power amplifier circuit utilizing MOSFET technology has gained significant popularity due to its aggressive sound characteristics when compared to traditional transistors and integrated circuits. It offers both low-frequency and high-frequency responses and is known for its durability. Generally, when comparing similar sound quality, MOSFET-based devices tend to require less bias voltage, making current control easier. However, some individuals argue that the output loss of power MOSFETs can make them more expensive than power transistors. Despite this concern, the advantages may outweigh the drawbacks. This document presents a collection of circuits capable of delivering over 150 watts of power, which could be beneficial for those interested in electronics projects. A student has expressed interest in constructing a 300W RMS stereo amplifier based on a MOSFET design characterized as OCL (Output Capacitor-Less), known for its excellent sound quality. A circuit designed by Anthony E. Holton has been identified, utilizing four 2SK1530 and 2SJ201 MOSFETs in parallel to achieve approximately 300W RMS of true power. Additional details regarding the circuit are available in the original documentation. Another circuit example is a MOSFET power amplifier rated at 160 watts, suitable for 8-ohm loudspeakers, particularly those with 18-inch drivers. This circuit employs classic MOSFET pairs, 2SK134 and 2SJ49, renowned for their exceptional durability. While this circuit is not new, it is recommended to consider the design carefully before constructing, as it is not overly complex for amateur electronics enthusiasts. Another notable configuration can deliver 180 watts using similar components, where parallel connections of J50 and K135 MOSFETs (rated for 70V) can achieve higher power outputs. With a 70V power supply and an 8-ohm load, this setup can provide 180 watts RMS. A circuit capable of delivering 240 watts has also been discovered, designed for both 4-ohm and 8-ohm loudspeakers, ensuring excellent sound quality, frequency response, and durability, while also including protective measures against damage. This amplifier circuit may fulfill the requirements of those seeking a music amplifier solution.

The described MOSFET power amplifier circuits are characterized by their robust design and high output capabilities. The use of MOSFETs, such as the 2SK1530 and 2SJ201, allows for efficient operation and high fidelity in sound reproduction. The OCL configuration eliminates the need for output capacitors, which can introduce distortion and affect sound quality. This design choice enhances the overall performance of the amplifier, making it suitable for high-power applications.

The amplifier's output stage, comprising multiple MOSFETs in parallel, effectively shares the load, reducing individual device stress and improving thermal management. The detailed design incorporates biasing techniques that ensure optimal performance across a wide frequency range, enhancing both low and high-frequency response.

In terms of construction, attention must be given to the layout of the circuit board to minimize parasitic capacitance and inductance, which can adversely affect performance. Adequate heat sinking for the MOSFETs is crucial to maintain reliability and prevent thermal runaway, particularly at high output levels. The choice of power supply is also critical; a regulated supply capable of delivering the required voltage and current without significant ripple is essential for maintaining amplifier performance.

Furthermore, the inclusion of protective circuitry can safeguard against overcurrent and overheating, ensuring the longevity of both the amplifier and connected loudspeakers. The design's ability to drive 4-ohm and 8-ohm loads makes it versatile for different audio applications, from home audio systems to professional sound reinforcement setups.

Overall, these MOSFET power amplifier circuits represent a compelling choice for audio enthusiasts and professionals seeking high-power amplification with superior sound quality and reliability.The power amplifier circuit using MOSFET has been very popular, because the sound is very aggressive, as compared to transistors and ICs. It can be low-frequency and high-frequency response as well, it is highly durable. Usually, if compared with the same sound. It will devices less. Due to the bias the voltage. Easier to control current. But some people say. If the power MOSFET output loss, more expensive power transistors. I agree with this, but, Is it not so bad. Today I have circuit collection of more than 150 watts of power, so it is a good idea for you. Hope this is helpful. Younger student brother will take an interest to do electronics project sends a teacher. Then come to consult with me. He wants to build Mosfet power Amplifier 300W rms model the stereo Amp. Which be the character OCL the sound is good. I then try to seek the circuit gives him sees in rows the way, accidentally meet this circuit. which design by Anthony. E. Holton. He designs this circuit well. Use power 2SK1530+2SJ201 MOSFET x 4 jigsaw puzzle parallel amounts. make have power amplify tall arrive at about 300W rms true power FULL watt. Detail other part want friends see in original circuit. This the circuit mosfet power amplifier OCL 160Watt sizes are full RMS. For 8ohm size loudspeakers build to sing bail 18 inch sizes well. By use mosfet cherished possession pair the last classic 2SK134 and 2SJ49 then have the durability is superb. This circuit not new handily. Should consider well before build. but difficult exceed nothing extremely amateur type our electronics It has power is 180 watt, uses a device similar.

Point of interest is the power mosfet transistor output NO. J50 and K135(be durable voltage 70V) connected parallel together it can drive power output is higher. When using a 70V power supply with 8 ohm load to power output of 180 watt RMS. At this empty period as a result seek Mosfet amplifier circuit keep give friends see in rows think out.

For this time I meets this circuit, about 240watt. When use 4ohm 8ohm loudspeakers which this circuit designed keep well, make have sound perfect power very much, both of the popularity in the sound, respond sound frequency has fully, and the durability, systematically protect the damage. All over amplifier by oneself and a loudspeaker that is usable. If a friend wants music amplifier circuit. I thinks this circuit may meet the demand your sure sir. 🔗 External reference