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Old 21st Apr 2004, 4:09 pm   #4
JHGibson
Hexode
 
Join Date: Apr 2003
Location: Salt Spring Island, BC, Canada
Posts: 368
Default Re: Improving Bush DAC90A sound quality.

I had a similar muffled sound problem with my DAC 10 which I believe has a similar circuit to the DAC 90A. The problem was that the cap from audio amp V3 to earth was 0.004uF (4000pF), which really cut into the high audio frequencies. I replaced it with a 390pF which is adequate to filter off the IF frequency and the sound from the radio really sparkles now.

I suspect that the draughtsman tidying up the engineers "back of an envelope" circuit diagram, made an error and then too large a cap went into production!

John.

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