Looks simple but powerful output stage for audio DAC or CD player.
Update 02 June 2021: Improvement of noise floor performance:
Add capacitor C999 10uF 400V between HV output and NFB pin. Mod can be done on both Lite and Premium units. Below you can find example of modification.
Additionally change resistors:
- R3 from 2k2 to 4k7 MMELF for both Lite and Premium PS (close to Q1)
- R6 in Lite and R9 in Premium from 220k to 470k MELF
- You can try to find lower noise 100V Zener diode in place of D9.
MuzgDIY 