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Little dot MK2 coupling caps
Little dot MK2 coupling caps
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Old 15th October 2019, 07:59 PM   #1
Datun Walnut is offline Datun Walnut  United Kingdom
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Default Little dot MK2 coupling caps

Hi All,
I fancy a dig around in my little dot MK2 headphone amp. I'm pretty new to this but think the obvious place to start a bit of modding may be the coupling caps.
According this schematic I found, it seems to be a 220ufd bypassed by a 0.68ufd - both electrolytics.
What type of caps would be suitable as a replacement do you think? Space is at a premium in there so massive Russian cans aren't an option.

Thanks in advance
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Old 16th October 2019, 11:51 AM   #2
DF96 is offline DF96  England
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You could try removing the 0.68uF bypass cap. It might make no difference, or it might improve things a little. As a general rule, cap bypassing is not needed in analogue audio.

You could try increasing the value of the 220uF, maybe to 470uF. Again it may make no difference, or it may improve things a little.
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Old 16th October 2019, 12:00 PM   #3
Datun Walnut is offline Datun Walnut  United Kingdom
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Thank for that. I wonder why the bypass is there then?
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Old 16th October 2019, 02:22 PM   #4
DF96 is offline DF96  England
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Possibly to impress audio journalists, who usually know more about audio trends than audio electronics.
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Old 16th October 2019, 03:36 PM   #5
starkeyg is offline starkeyg
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Hello,

Another thing you could try is replacing the 220uf cap with a bipolar. That should reduce what little distortion there is. Going with a larger value and larger voltage rating should help a little as well. If the change is enough to hear is a real question.
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