The many ideas of 100 watt amplifier circuit

The power amplifier Hi-Fi OCL 120W RMS is designed to operate effectively when paired with a suitable power supply circuit and 8-ohm speakers. This circuit exclusively utilizes transistors without any integrated circuits, resulting in a clean sound output. The recommended power supply voltage is +40V and -40V, providing approximately 4A of current. For further details, refer to the accompanying circuit diagram. Additionally, this Hi-Fi amplifier circuit incorporates IGB technology, achieving a maximum output of 140W while maintaining Class AB biasing for excellent sound quality. The power supply specifications for this amplifier are +43V and -43V, with a current requirement of around 5A. This configuration is optimized for 8-ohm speakers, delivering between 120W and 145W of power. Although the circuit may be complex for beginners, careful construction is advised to ensure proper functionality. The MOSFET power amplifier, utilizing IRF540 and IRF9540, is another recommended option. Operating at a lower power supply voltage of +35V and -35V, this Class AB OCL amplifier requires approximately 3A of current and offers a balanced sound output. The design includes protective features to prevent damage to the loudspeakers. This circuit also integrates a 220uF capacitor and two diodes to mitigate switch-on thump by controlling the output capacitor charging process, which can be particularly beneficial in bi-amp or tri-amp systems with active crossover filters.

The Hi-Fi OCL 120W RMS power amplifier is a robust design intended for high-fidelity audio applications. The circuit primarily employs discrete transistors, ensuring a high level of audio quality without the potential complications introduced by integrated circuits. The specification of using a power supply voltage of +40V and -40V, along with a current rating of 4A, is critical for achieving the desired output power while maintaining stability and performance.

When considering the circuit's implementation, it is essential to focus on the choice of components, particularly the transistors, which must be capable of handling the specified voltage and current ratings. The use of high-quality transistors will contribute to the overall sound quality and reliability of the amplifier.

The inclusion of IGB technology in the alternative circuit design allows for a higher output of up to 140W, while still adhering to Class AB operation principles. This configuration is particularly advantageous for users seeking to drive 8-ohm loudspeakers, as it provides a wide dynamic range and excellent sound reproduction. The recommendation of a power supply voltage of +43V and -43V, coupled with a current rating of 5A, ensures ample headroom for demanding audio signals.

For those interested in a MOSFET-based power amplifier, the circuit utilizing IRF540 and IRF9540 transistors presents a user-friendly option. Operating at a lower voltage of +35V and -35V and requiring around 3A, this design is less complex and offers a moderate sound quality suitable for various audio applications. The protective features integrated into this circuit help safeguard both the amplifier and connected loudspeakers from potential damage, making it a reliable choice for audio enthusiasts.

The addition of a 220uF capacitor and diodes for switch-on thump suppression is a thoughtful design consideration. This feature can significantly enhance the listening experience, especially in systems where speaker sensitivity is a concern. By preventing low-frequency signals from reaching high-frequency drivers during power-up, the circuit helps maintain clarity and reduces unwanted noise.

Overall, these power amplifier designs cater to a range of audio applications and user experience levels, providing options for both novice builders and experienced audio engineers.The power Amplifier hi-fi OCL 120W rms sizes really, if use power supply circuit at enough good and use 8ohm size prominent point interesting loudspeakers. Of the circuit be use the transistor entirely have no the integrated circuit mixes. Then make bland good sound, for power supply voltage should use +40V GND -40V sizes give current about 4A.

Other detail please see in circuit picture better. As collect power amplifier hifi circuit come to many the circuit. Today I begs for to advise the circuit that uses IGB be important equipment. And still give tall drive arrives at 140W interesting good. This circuit still very bias keep well be amp class AB. At power shape the loud sound is excellent. Use power supply model Amp OCL the general by use Voltage +43V GND -43V. And should use the size current 5Amp sizes go up then give enough tall usual this circuit uses 8ohm loudspeakers s have are having about 120-145Watt. when see the circuit may inappropriate for a novice. If you will build should are careful specially request enjoy have. Power amp HIFI good listen please sir. Friends many you may admire MOSFET power amplifier, because of good sound and durable. Today I begs for to advise 120W MOSFET power amplifier by IRF540 and IRF9540 the circuit are the character of main Amp, Build not difficult, because of use power Supply Voltage lowness about +35V GND -35V.

but use current about 3A circuit character cheap very is OCL Amplifier Class AB then good moderately sound. And systematically protect fully both of protect through the circuit a loudspeaker is damaged and other.

When see the circuit has already use moderately equipment then not convenient for a novice, but still use in rows building meditation and check to repair MOSFET power amplifier. The circuit is other, get please sir. This includes a 220uF capacitor and two diodes to slow down the switch-on to reduce the output thump as the output capacitor charges through the speaker.

This is not essential, depending on speaker sensitivity, with my own speakers there is just an unobtrusive low frequency sound at switch-on. With other applications such as a bi-amp or tri-amp system with active crossover filters, this addition may become more useful to avoid low frequencies reaching high frequency speaker drivers.

It may also have some point if a high sensitivity speaker is used, so it makes sense to include it in this low noise version. 🔗 External reference