Integrating head amp into system

Stuey · 4th January 2008, 12:33 AM

Hi all,

I'm building an integrated SS amplifier and intend, at the construction stage, to make integration of a separate-chassis SS headphone amplifier as easy as possible.

How is switching of the source to the inputs of a separate headphone amplifier 'usually' done? Are these commonly taken from the output of the pre-amp?

I am thinking of making the pre/power sections (which will be in the same casing) able to be used separately via some sort of short external jumper arrangement on the back panel.

Cheers

Stuey

Dan2 · 4th January 2008, 10:04 AM

i would take the output from the pre-amp to run the headphones.

you may have to ground the power amp inputs when you switch the preamp to the headphone output, or you might get a buzz on your main speakers.

Stuey · 4th January 2008, 10:22 AM

Thanks for your comments Dan.

Yes, I guess two switchable pre-outs seems to be the best option, one being connected to the power amp input, and the other to the headphone amp.

Stuey

Stuey · 5th January 2008, 12:36 AM

Hmmm...just had a rethink when not under the influence of Corona and realised that it'd probably be better to run the headphone amp from line level, eliminating the pre-amp circuitry from the equation. Of course, most headphone amps would be designed to be driven directly.

A tape loop seems to be the way, but then you lose the control functionality (volume at least). Still, that's easy to implement on the headphone amp.

Onward...

Cheers

Stuey

4th January 2008, 12:33 AM	#1
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Integrating head amp into system Hi all, I'm building an integrated SS amplifier and intend, at the construction stage, to make integration of a separate-chassis SS headphone amplifier as easy as possible. How is switching of the source to the inputs of a separate headphone amplifier 'usually' done? Are these commonly taken from the output of the pre-amp? I am thinking of making the pre/power sections (which will be in the same casing) able to be used separately via some sort of short external jumper arrangement on the back panel. Cheers Stuey

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4th January 2008, 10:04 AM	#2
Dan2 diyAudio Member Join Date: Sep 2005	i would take the output from the pre-amp to run the headphones. you may have to ground the power amp inputs when you switch the preamp to the headphone output, or you might get a buzz on your main speakers.

4th January 2008, 10:22 AM	#3
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Thanks for your comments Dan. Yes, I guess two switchable pre-outs seems to be the best option, one being connected to the power amp input, and the other to the headphone amp. Stuey

5th January 2008, 12:36 AM	#4
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Hmmm...just had a rethink when not under the influence of Corona and realised that it'd probably be better to run the headphone amp from line level, eliminating the pre-amp circuitry from the equation. Of course, most headphone amps would be designed to be driven directly. A tape loop seems to be the way, but then you lose the control functionality (volume at least). Still, that's easy to implement on the headphone amp. Onward... Cheers Stuey

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