FX-Audio FX502S PRO amplifier upgrade! [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
Website and contacts: https://dacmaster.com
Projects for Ukraine: https://dacmaster.olx.ua