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16th September 2003, 07:58 PM
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diyAudio Member
Join Date: Dec 2002
Location: The Netherlands
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Aleph P input attenuator
Question :
The four switches in the Aleph P schematic are used for adjusting the input levels. When sw 1.1 and 1.4 (just one input) are open, i get -3dB ( 20log(22100/32100). With sw 1.1 open and 1.4 closed i get -13 dB (20log(2886/12886) But these are not the values which Nelson notes in the Aleph P service manual. What am i doing wrong ???  Or am i missing some other resistors that should be included in the calculation ? Grtz, Nick ps : i want to learn more about this because i want to be able to calculate input and output levels, like in the P and BoSoZ |
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