Electronic works 400 W 1943 MOSFET Based DIY Stereo Audio Amplifier Circuit Board (Better Than 4440 3055 and 4141 STK) : Amazon.in: Electronics
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BRZHIFI Bluetooth kompatibel 5,0 QCC5125 Verstärker 2*80W Power HD Audio AUX APTX APTX HD HiFi Mini Amp DIY Stereo Heimkino| | - AliExpress
Build Your Own Professional-Grade Audio Amp on the Sort of Cheap - IEEE Spectrum
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Pete Millett's DIY Audio pages
Digital HiFi Amplifier 60W + 60W & TPA3116D2 Chip Digital Amplifier Home Car DIY Stereo Amplifier for Home Office Speaker Subwoofer : Amazon.de: Electronics & Photo