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Now downloading free:Arcam A65 & 75

Download Arcam A65 & 75 docs - Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information

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File name:Arcam-A65_75 amp.pdf
[preview A65 & 75]
Size:597 kB
Model:A65 & 75 🔎
Descr:integrated amplifier
Group:Electronics > Consumer electronics > Audio >
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Arcam-A65_75 amp.pdfService Manual A65/75 Issue 1.0 DiVA A65, A75 & P75 Amplifiers ARCAM Contents List ! Contents list ! Circuit description ! Service guide ! Circuit diagrams ! Component overlays ! Circuit board parts list ! General assembly parts list A65/75/75P Circuit Description PSU In order get the output devices to turn fully on and achieve the greatest efficiency, an auxiliary rail is formed from a charge pump driven by the main AC outputs from the transformer. C304,305 & D301,302 charge on alternate cycles. In the other cycle the charge on C304,305 is pumped into C310,311 respectively. This creates a voltage much greater than the standard rails, but with low regulation and high ripple. This is then regulated to 38V via emitter followers Q300,302,303,305 from a zener stabilized voltage (D304,305) The Pre-amp 15V supply comes from linear regulators Z300,301. The transformer is a dual voltage unit, the required voltage being selected by which fuse holder is fitted with the approp

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