Доработка (апгрейд) усилителя FX-Audio FX502S PRO! [DacMaster]

A new twist on tuning the "people's" FX-Audio FX502S PRO amplifier! UPDATE!!! The upgrade also included replacing the field-effect switch on the power supply input with a powerful one from Infineon! Additionally, the preamp gain and passive low-pass filters before and after the power amplifier have been recalculated, Ripple Rejection has been enabled in the LM317 IC, etc. 0:00 - Introduction; 05:28 - The Impact of the Power Supply on Sound Quality; 06:58 - Second-Order Output Filter (Capacitors); 10:58 - Main Capacitors; 11:58 - Additional Capacitors; 12:37 - Selecting Interstage Capacitors; 15:09 - Other Filter Elements; 15:33 - Operational Amplifiers; 16:18 - Reworking the power supply and op-amp circuit; 22:22 - Removing feedthrough capacitors; 24:25 - (Not)using bypass capacitors. 👉 A high-quality power supply for this amplifier (it's better to choose a 24V one, as 32V, while louder, will still overheat the amplifier too much): https://a.aliexpress.com/_EH1cc8d 👉 For those looking to save money, you can buy a power supply without a case: https://a.aliexpress.com/_EJ1h1lL P.S.: The TPA3250 differential input has ~+3.9V, so removing four interstage capacitors isn't really worth it, but a couple of capacitors at the preamplifier input is perfectly fine! Yura Ignatiev's Channel:    / @souskrasnodaroff   My Projects: https://dacmaster.olx.ua Hi-Fi Forum Profile (via VPN): https://hi-fi-forum.net/profile/34545 Email: [email protected] (Dmitry Makarov) Telegram: @dacmaster