Hakuin SE Class A HP Amp

[DontHertzMe]

I had an enclosure that I wanted to use for the amp

Those enclosures are gorgeous! A lovely build.

 

[tumaru]

I just realized I broke my pocket class a v1 and was wondering if you were going to sell this new version of if I should remake the v1? Also I still have the original mosfets to make anouther one should I use them or the ones you currently suggest using?

 

[xrk971]

The full blown Hakuin with battery management and DCDC is still too far from verified. The amp proper and power output stage works.

Do you need a replacement PCB for your pocket amp?

 

[tumaru]

I'll order a replacement PCB from your etsy.


What is the difference between the mosfets?


Also you mentioned replaceing the 2.2 uF with a 10uF but said it didn't fit. I was wondering what the effect using that would have out of curiosity?

 

[Dibya]

@tumaru use a 10uf Muse KZ or 10uf Elna Silmic II

Bypass both with 0.1uf film , sounds amazing.

 

[tumaru]

Which 10uf Muse KZ or 10uf Elna Silmic II should I use?


Which 0.1 uF bypass should I use and sorry just to so I don't assume and get it wrong where do both of these go?

 

[yourownbuzz]

Thanks for the show of interest. Actually, I did lose momentum for the lack of interest by people. It’s a lot of work to do these projects and I move on if it doesn’t seem to gather the steam needed. The amp works fine - I ran into issues with the fuel gauge feature. It required reconfiguring all of the resistors to get it to work.

I guess by the sounds of it this is on the backburner for you, but if you're ever thinking about gauging interest to pick it back up - I'm still up for it. Still looks like the altoids tin/portable version will be a fun build. (Although with the whole covid and stay at home sit at desk thing I've been using speakers more than anything else)
I've been checking back every so often to see what's happening.
(and I guess good thing with fuel gauge is that it's a nice to have but not an integral part of the amp )

 

[xrk971]

I was talking to JPS64 the other day and he is interested in reviving this. We have found a great manufacturer of CNC aluminum chassis / cases. We could easily make one for this amp now. Let me discuss with JPS64 again and see if we can move this out of the back burner. The fuel gauge and PSU DCDC boost and charging is integral and important. This amp is Class A and goes through batteries just like that. So having a convenient and reliable way to charge is important.

 

[xrk971]

Hi Folks,
Hakuin has been revived from the dead! JPS64 has been busy and we now have a revamped power management system and battery charger. Plus we have the latest ES9281A portable DAC from ESS! It’s certainly exciting to see this. Stay tuned…

 

[pinkfloyd4ever]

Nice! Now I can build a DAC/Amp that’s small enough to use on my desk at work, instead of having to buy a commercially made one! Can’t wait. I assume you’ll be offering the board with the DAC chip pre-soldered?

 

[xrk971]

It’s a lot of SMD work. We might just sell it RTR.

 

[wirewiggler]

X,
I will commit to it RTR, no hurry have plenty to do but would fit real smart with my portable kit.
Bill

 

[wirewiggler]

If you work out the case for it I will commit to it as well.
Bill

 

[xrk971]

Yes, we will make the while thing case and all. It really won’t work without the case as needed for heatsinking and holding everything together.

 

[Kellis]

This amp piqued my interest for a desktop HPA for office use, due to its simplicity and ready availability of parts. I've put together a PCB using Bambinz's CCS mod, and a TTA004B in place of the DZT because my phones are 32 ohm. It's not the prettiest layout, but I wanted to use mostly THT components and still come in at under 100x100mm to keep the PCB's cheap. I added a CRCRC filter on the DC input, with separate second filter stages for the left and right sides.

I did have one question though: what is the best method for finding the resistor combinations needed to raise the bias current to ~125mA? Just plugging values into LT Spice and seeing what happens?

Pictures of layout and circuit attached. Would be happy to share the files with anyone interested in building a simpler version of the amp, if that's OK with xrk! Also of course, any critiques are welcome.


Thanks,
Kellis

 

[xrk971]

Neat work, Kellis! You will have to figure out the new setpoints as the CCS makes it a different input stage.

 

[h22]

nice looking amp, are PCBs available? if so how do i get a couple?

thanks

joe

 

[h22]

how does one get his greasy fingers on a pcb or two?

 

[xrk971]

Are you referring to the one designed by Kellis above?

 

[h22]

no, the "Hakuin" , curious of there are boards or kits available.

please forgive the redundant post above .

I ordered a Pocket Class A Headphone Amp pcb off of your etsy store, cant wait to put it together, this seems like a cool project as well, so i was hoping that there were PCBs available.

thanks