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X-Altra HPA-1 Class A Headphone Amplifier
X-Altra HPA-1 Class A Headphone Amplifier
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Old 17th June 2021, 06:21 AM   #141
Bonsai is offline Bonsai  Europe
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X-Altra HPA-1 Class A Headphone Amplifier
This depends on how efficient the headphones are. The HPA-1 will drive 16 Ohms - it current limits at about 250-300 mA output. If you phones are efficient then they will be load enough well before this point, otherwise not.

I would try it, and if you’re not happy, then build a second amp.
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Old 23rd June 2021, 09:02 AM   #142
Mooly is offline Mooly  United Kingdom
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X-Altra HPA-1 Class A Headphone Amplifier


@LarsLWO Why are you posting under two identities within this thread?
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Old 23rd June 2021, 12:49 PM   #143
LarsLWO is offline LarsLWO
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IĎm not. IĎm working together with my roommate. IsnĎt that okay?
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Old 23rd June 2021, 12:56 PM   #144
Mooly is offline Mooly  United Kingdom
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X-Altra HPA-1 Class A Headphone Amplifier
That is OK but I hope you understand why we have to ask.
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Old 2nd July 2021, 07:37 PM   #145
Vrystaat is offline Vrystaat  South Africa
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Andrew, thanks a lot,it is much appreciated ! I have received the board today. Just to good to be true with this Post Office in this broken place.
Now to order those minute nipper components !
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Old 3rd July 2021, 05:46 AM   #146
jaycee is offline jaycee  United Kingdom
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An interesting design Bonsai. I'll play with it in LTSpice, and then I might build this into my own DAC rather than the simple diamond buffer I was planning to add
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Old 3rd July 2021, 07:37 AM   #147
kaliwraith is offline kaliwraith
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Bonsai, can you combine shipping on the headphone amp and phono preamp?
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Old 3rd July 2021, 11:04 AM   #148
Bonsai is offline Bonsai  Europe
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X-Altra HPA-1 Class A Headphone Amplifier
Yes, anything you want.

I have a power supply board coming for the headphone amp (it’s also for the coming line level pre). It’s about 2 weeks away if you want to wait for that as well.
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Old 3rd July 2021, 11:05 AM   #149
Bonsai is offline Bonsai  Europe
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Quote:
Originally Posted by Vrystaat View Post
Andrew, thanks a lot,it is much appreciated ! I have received the board today. Just to good to be true with this Post Office in this broken place.
Now to order those minute nipper components !
thatís great!
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Old 3rd July 2021, 11:14 PM   #150
kaliwraith is offline kaliwraith
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Quote:
Originally Posted by Bonsai View Post
Yes, anything you want.

I have a power supply board coming for the headphone amp (itís also for the coming line level pre). Itís about 2 weeks away if you want to wait for that as well.

Very cool. Yeah waiting is no problem. I am very slow to complete projects...
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