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DAC + headphone amplifier based on Marantz DR4050
DAC + headphone amplifier based on Marantz DR4050
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Old 23rd September 2018, 08:45 PM   #21
peterpl is offline peterpl  Poland
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Join Date: Dec 2017
Location: Siemianowice Śl.
I am still thinking why sound from external source is weaker in headphones than sound from CD. I thought that maybe CD sound is more amplified.
Now I start to suspect that external sound can be muted by killing transistors 7410 and 7411.
Picture shows CDR board and exit from op amp 7408.
Can you tell me how to disable those transistors ?
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Old Yesterday, 10:57 AM   #22
peterpl is offline peterpl  Poland
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Join Date: Dec 2017
Location: Siemianowice Śl.
Just a small addendum to a post above, as you see current coming to transistor base goes from "kill" circuit (attached). What is a purpose of that circuit and what would happen if I cut voltage supplying it ?
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