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6N3/6N6 headphone amp using PCB.
6N3/6N6 headphone amp using PCB.
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Old 14th December 2020, 04:31 PM   #31
Ryssen is offline Ryssen  Sweden
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Does the "output cap" have to be as large as 470uF?
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Old 14th December 2020, 04:52 PM   #32
kodabmx is offline kodabmx  Canada
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6N3/6N6 headphone amp using PCB.
No.
You chose the size based on the load you will drive and the LF response you want.

If you use it as a line stage, it could be as small as 1uF if you're using it to drive a tube amp.
I chose 470uF because they are common and give a good LF response on 32R headphones. If I was making one for just my ATH-R70x (470R) I'd use a 47u film cap only.

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Old 14th December 2020, 05:01 PM   #33
DontHertzMe is offline DontHertzMe  South Africa
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6N3/6N6 headphone amp using PCB.
-3dB frequency is = 1/(2πRC). So the lower impedance your headphones are the bigger the capacitor needs to be
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Old 14th December 2020, 05:03 PM   #34
kodabmx is offline kodabmx  Canada
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6N3/6N6 headphone amp using PCB.
Yup so for 32R headphones it's a crappy -3 of 10Hz but for the 470R headphones I use normally, it drops to 0.7Hz
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