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Audio Analogue Soundpleasure Bellini preamplifier manual

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Table of contents for the manual

  • Page 1

    A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A s.r.l. Bellini prea m plifier – Virtual Battery off line po w er supp ly 1 / 5 Issue Date: June 2 008 AUDIO FUTURA s.r.l. Research & Development E-Mail (su pport): sblanda@audioanalo gue.com podesta@audioanalo gue.com saggini@audioanlo gue.com elia@audioan[...]

  • Page 2

    A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A s.r.l. Bellini prea m plifier – Virtual Battery off line po w er supp ly 2 / 5 Introduction To achieve t he best perf ormance in a high end cha in, first noise a nd interferences must be reduced in all the parts and especially in the stages before power amp li[...]

  • Page 3

    A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A s.r.l. Bellini prea m plifier – Virtual Battery off line po w er supp ly 3 / 5 Virtual battery The target i s to not have power suppl y interferences at all. The first step is to cl ean out the AC li ne, and t hi s is what is done with an “AC filt er”. But[...]

  • Page 4

    A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A s.r.l. Bellini prea m plifier – Virtual Battery off line po w er supp ly 4 / 5 Of co urse the story goes on cycle by cycle setting the appropriate vol tage at the in put of Voltage r egulators 3 and 4. Fig. 1 - Sch ematic The virtual battery works s upp lying [...]

  • Page 5

    A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A A U D I O F U T U R A s.r.l. Bellini prea m plifier – Virtual Battery off line po w er supp ly 5 / 5 FFT Spectrum A nalysis at Vol ume maximum As you can see in the graphics the 50Hz component hav e bee n reduced to - 12 0dB. Probably that value is due much more to the influence th[...]