Mosfet Amplifier OTL 100W by K1058J162

This circuit includes a 220µF capacitor and two diodes designed to slow down the switch-on process, thereby minimizing the output thump that occurs as the output capacitor charges through the speaker. While this feature is not essential and may vary in necessity depending on speaker sensitivity, it has been observed that with certain speakers, only a subtle low-frequency sound is present during switch-on. In applications such as bi-amping or tri-amping systems with active crossover filters, this addition may prove beneficial to prevent low frequencies from reaching high-frequency speaker drivers. It is also advantageous when used with high-sensitivity speakers, making it a sensible inclusion in low-noise versions of the circuit.

The described circuit employs a 220µF capacitor in conjunction with two diodes to create a controlled power-on sequence for audio amplification systems. The primary function of the capacitor is to store energy, which allows for a gradual increase in voltage across the output when the circuit is powered on. This gradual ramp-up helps to prevent sudden surges of current that can lead to unwanted thumping sounds through the connected speakers, particularly during the initial charging phase of the output capacitor.

The inclusion of diodes serves to direct the current flow in a manner that further smooths the power-on characteristics. By allowing the capacitor to charge through the diodes, the circuit can mitigate any abrupt changes in voltage that may occur when the system is first activated. This is particularly important in high-fidelity audio applications, where even minor disturbances can be audible and negatively impact the listening experience.

In scenarios involving bi-amping or tri-amping setups, where multiple amplifiers are used to drive different frequency ranges, the role of this circuit becomes even more critical. Active crossover filters are often employed in such systems to divide the audio signal into separate frequency bands, directing them to the appropriate drivers. Without the gradual power-on feature, low-frequency signals could inadvertently reach high-frequency drivers, potentially causing damage or distortion.

In summary, the circuit's design, featuring a 220µF capacitor and dual diodes, is a thoughtful approach to enhancing audio quality by ensuring a smooth power-on experience, particularly in sensitive or complex audio systems. This consideration is essential for maintaining the integrity of sound reproduction and preventing any undesirable artifacts during operation.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 sy stem 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.

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