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Audio Analogue SRL 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 (support): sblanda@audioanalo gue.com podesta@audioanalo gue.com saggini@audioanlo gue.com elia@audioana[...]

  • 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 per formance in a high end ch ain, first noise a nd interferences must be reduced in all the parts and especially in th e stages before power ampli[...]

  • 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 supp ly interferences at a ll. T he fi rst step i s to cl ean out the AC li ne, and t hi s is what is done wit h an “AC fil ter”[...]

  • 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 cycl e setting the appropriate vol tage at the inpu t of Voltage regulators 3 and 4. Fig. 1 - S chematic The virtual battery works sup plying a[...]

  • 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 Analysis at Vol ume maximum As you can see in th e graphics the 50Hz component hav e be en reduced to -12 0dB. Probably that value is due much more to the influence the[...]