Hello,
I am looking forward to build a headphone amplifier and looking for a project/schematic I could use as a reference. I am looking for the following:
At the moment I have seen:
Do you have any recommendations?
Thank you!
Best
Florian
I am looking forward to build a headphone amplifier and looking for a project/schematic I could use as a reference. I am looking for the following:
- capable of driving a pair of Beyerdynamic DT880 250 Ohm which I am using at the moment (if possible also the 600Ohm version), probably will upgrade later
- Class A (the single ended class a topology or in genereal the designs by Nelson Pass really appeal to me 🙂 )
- external PSU prefered
- parts which are available at the known large distributors, if possible also in a few years
- maximum size around 200x200x50mm
At the moment I have seen:
- ACP+ (needs to be modified for 250Ohm impedance)
- AMB M³ ("active ground technology" which is new for me)
- Whammy (internal PSU, therefore quite large)
Do you have any recommendations?
Thank you!
Best
Florian
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My favorite small Class A headamp is the balanced Dynalo which can easily drive any dynamic headphones out there. Shouldn't cost more than $500 to build if you don't pay too much attention to the chassis.
I actually think this assembled kit is super hard to beat for merely more than $100: https://www.ebay.com/itm/3251926702...HbusGwtRI-&var=&widget_ver=artemis&media=COPY
I actually think this assembled kit is super hard to beat for merely more than $100: https://www.ebay.com/itm/3251926702...HbusGwtRI-&var=&widget_ver=artemis&media=COPY
I have kits for the real Dynalo 😉 Superb amp.
The Marsh amp is also very good and very simple,
https://www.diyaudio.com/community/threads/marsh-headphone-amp-from-linear-audio.211394/page-87
The Marsh amp is also very good and very simple,
https://www.diyaudio.com/community/threads/marsh-headphone-amp-from-linear-audio.211394/page-87
May I suggest you consider Omicron? It is simpler and cheaper than many alternatives, yet it is in a different league in terms of fidelity. Those who built it say the sound quality is "fantastic". It was not designed for an external power supply, but it has been routinely built in 200×200×50mm boxes with its internal power supply; here is a nice example. The only catch is that its PCBs are not immediately available unless a past GB participant is willing to part with his.
probably hard to beat, but I would like to do a bit more by myself 🙂
But Dynalo is noted, will look into that.
Thanks, looks nice!
No problem, I am willing to do the layout by myself if needed (as long as I can get the schematic/parts).
Do you have more information/test for this design?
Nice harmonics, high-ish THD, amplification a bit more than 3x, should sound interesting I think:
Thanks for the simulation, have you built it?
3rd harmonic looks a bit high, I should have added that I am looking more for even order harmonics.
No, I did not built it (yet). The amplification of 3x may be enough for 80 ohm headphones but probably not for 250 ohm ones.
I am not sure yet how to change the circuit for an amplification of 9x, but I'd suggest you take a look at 3 Transistor HP Amplifier with low dist.
That one I built, not the 300 ohm version but the original one and it sounds very good. No harmonics like these however.
I am not sure yet how to change the circuit for an amplification of 9x, but I'd suggest you take a look at 3 Transistor HP Amplifier with low dist.
That one I built, not the 300 ohm version but the original one and it sounds very good. No harmonics like these however.
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I have been using it 24/7 for the ten years or thereabout. It has been connected to an HD800 permanently and is my main listening device. Connected directly to a D50 DAC. Can't hear any problems with it.I listen to a wide variety of music from rock to classics, but no modern rap crap
I like the Whammy I must admit, I have built a couple one with a Burson V7 in which is quite interesting. Drives pretty much everything I own including 250 Ohm 990 Pro's
That looks like a well documented project! The link is pointing to an older version, here is the website for the current version for anyone who is also interested: Sapphire 4
I am wondering a bit about output power because of the small heatsinks, what kind of headphones are you using?
And did someone had the chance to compare it to a Pass ACP+? 😀
And we must not forget Salas DCG3 : https://www.diyaudio.com/community/threads/salas-dcg3-preamp-line-headphone.296406/
Heatsinks can be enlarged. I don't use the recommended model either.
The amplifier is good enough for your headphones too.
AKG702
..............
I recommend this amplifier because I have several pcbs for sale.
🤣🤣🤣🤣🤣🤣🤣🤣👽
Just kidding... That's not the reason.
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Like this schematic a lot (cause I've all components stocked 😁)
How does it with 16ohm cans?