6N3/6N6 headphone amp using PCB. - Page 4

Ryssen · 14th December 2020, 04:31 PM

Does the "output cap" have to be as large as 470uF?

kodabmx · 14th December 2020, 04:52 PM

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.

Koda

DontHertzMe · 14th December 2020, 05:01 PM

-3dB frequency is = 1/(2πRC). So the lower impedance your headphones are the bigger the capacitor needs to be

kodabmx · 14th December 2020, 05:03 PM

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

14th December 2020, 04:31 PM	#31
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Does the "output cap" have to be as large as 470uF? __________________ Regards Åke

14th December 2020, 04:52 PM	#32
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	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. Koda __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

14th December 2020, 05:03 PM	#34
kodabmx Spreading triode love. diyAudio Member Join Date: Oct 2011 Location: Toronto	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 __________________ If you can't learn to do something well, learn how to enjoy doing it poorly.

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14th December 2020, 05:01 PM	#33
DontHertzMe No Morse diyAudio Member Join Date: Jul 2013	-3dB frequency is = 1/(2πRC). So the lower impedance your headphones are the bigger the capacitor needs to be