100-Watt Class AB Power Audio Ampl

I'm excited to introduce my latest creation: a high-performance Class AB power audio amplifier capable of delivering an impressive 100 watts

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Welcome to my project where I'm diving into the world of audio amplification to craft a powerful 100-watt Class AB audio amplifier. This amplifier is designed to deliver robust sound, perfect for gaming, movies, and music at home, with an emphasis on rich bass and sub frequencies.

I have engaged in discussions with a reputable Chinese manufacturer regarding the production of an amplifier kit. This comprehensive kit comprises a PCB board, essential components, and a heat sink. The primary concept is to offer this board for sale as a DIY (Do-It-Yourself) solution, empowering enthusiasts to assemble it themselves.

This amplifier board boasts impressive audio quality, making it an ideal proposition for audio enthusiasts and hobbyists alike. However, in order to achieve a lower production cost, the manufacturer requires a larger production quantity. This leads me to consider utilizing Kickstarter as a platform to gather interest and potential pre-orders for the kit. By presenting the amplifier kit on Kickstarter, I aim to gauge the level of interest and commitment from individuals who are keen to purchase the kit. This approach will not only help validate the demand but also ensure a smoother production process.

Your insights and suggestions on this approach would be greatly appreciated

  • my proper Blog

    aymen09/08/2023 at 11:46 0 comments

    finally i take the decision to make my own blog so i can share my work


  • remaking a good pcb

    aymen08/25/2023 at 21:20 0 comments

    last time the pcb was not good, so i repeat the work and i get a good one

  • the pcb

    aymen08/24/2023 at 18:32 0 comments

    trying to do pcb in home

  • do it in eagle !!

    aymen08/23/2023 at 13:48 0 comments

    I have started designing the solution in Eagle CAD. The challenge is to create a compact board since I'm aiming to develop a test board primarily to assess its bridging capabilities. I have made adjustments to the schematic to ensure it operates within the ±25 Volt range.

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Isaac Wingfield wrote 08/26/2023 at 04:27 point

It's a good idea to have D2 and D3 thermally coupled to the output devices. That will improve the bias point stability over temperature. For best thermal tracking, consider using transistor base-emitter junctions for the diodes. Also, you might consider a small inductor in the output line, to help prevent oscillation in the case of a speaker that looks capacitive.

I like using an inverting topology for the amp so the feedback can be applied to the signal input instead of the "other" input. The way you have it presumes a symmetry for that diff pair which might be a bit optimistic.

Because of the increased power output available in a bridging configuration, the currents in the output stage will be much greater (that extra power has to come from somewhere), so make sure the power supply and heat sinks are up to the task.

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aymen wrote 08/26/2023 at 10:44 point

thank you for sharing your experience,

I supposed that D2 + D3 make voltage lowel then the 2x VBE because the BDX are Darlington. and i supposed to correct hte VBE cross by the differetial stage. I need to make power test to be sure that i dont will be derive to tthermal problems

I dont have experience about zobel filter and capacitive effect, so thank you for the reminder

I dont kow about inverting topology but seems awesome 

for bridge solution i try to make experience and see thermal evolution


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