MOSFET follower headphone amplifier - Page 13

EUVL · 18th July 2011, 01:43 PM

I never say anything like my design is better than others.

But for those few who bothered to build one, they all love it.
Especially if you have a low impedance can (like Grado or AKG), which the HD555 probably isn't.

Not that it will sound bad on a 555, but you are not using its current delivery capability to the full.

Patrick

Dr.H · 18th July 2011, 04:20 PM

What is the impedance on the Grado or AK? Senn HD555 is around 50R.

dw1narso · 20th July 2011, 05:58 AM

@Dr.H: Grado usually is 32ohm. AKG depend on models, 62ohm to 120ohm.

HD555 at 50ohm should be fine too... HD555 (and most Sennheiser phones) is not a current hungry phones

It is not the impedance itself, but the combination of low impedance + lower sensitivity that makes Grado and AKG need more current to really sing. While Sennheiser phones are usually highly sensitive (+ high impedance on the HD600 and above models)

dw1narso · 20th July 2011, 06:01 AM

Copied my question from here to here...

@Patrick: sorry, for the very basic questions:
1. is this a unity gain amp (or not)?
2. could I put a potentiometer in the input?
3. what is the [maximum] acceptable preceding stage (source or pre-amp) impedance before the DAO?

thanks,
David

EUVL · 20th July 2011, 03:11 PM

Answered at the other place.

Patrick

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18th July 2011, 01:43 PM	#121
EUVL diyAudio Member Join Date: Oct 2003	I never say anything like my design is better than others. But for those few who bothered to build one, they all love it. Especially if you have a low impedance can (like Grado or AKG), which the HD555 probably isn't. Not that it will sound bad on a 555, but you are not using its current delivery capability to the full. Patrick

18th July 2011, 04:20 PM	#122
Dr.H diyAudio Member Join Date: Apr 2002	What is the impedance on the Grado or AK? Senn HD555 is around 50R.

20th July 2011, 05:58 AM	#123
dw1narso diyAudio Member Join Date: Mar 2004 Location: Jakarta	@Dr.H: Grado usually is 32ohm. AKG depend on models, 62ohm to 120ohm. HD555 at 50ohm should be fine too... HD555 (and most Sennheiser phones) is not a current hungry phones It is not the impedance itself, but the combination of low impedance + lower sensitivity that makes Grado and AKG need more current to really sing. While Sennheiser phones are usually highly sensitive (+ high impedance on the HD600 and above models)

20th July 2011, 06:01 AM	#124
dw1narso diyAudio Member Join Date: Mar 2004 Location: Jakarta	Copied my question from here to here... @Patrick: sorry, for the very basic questions: 1. is this a unity gain amp (or not)? 2. could I put a potentiometer in the input? 3. what is the [maximum] acceptable preceding stage (source or pre-amp) impedance before the DAO? thanks, David

20th July 2011, 03:11 PM	#125
EUVL diyAudio Member Join Date: Oct 2003	Answered at the other place. Patrick

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