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Aksa Lender HPA
Aksa Lender HPA
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Old 30th August 2018, 02:26 PM   #51
yourownbuzz is offline yourownbuzz
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Haven't tried crimping again yet, but I'll post a picture next time I get round to doing some crimps.

Mounted this one up, waiting on the dupont connectors for the pot, eventually it'll be occupying that hole between the headphone jacks. For now it has some pcb pins on its legs to extend them. Jst for power is temporary, will be a terminal block when I get some with the right pitch.
The mosfets on the daughterboards gets pretty toasty so ended up with the larger heatsinks on them.
3300u FC on outputs, but that may change.
This step up has a weird 3 stage whine on first power up so probably gonna swap it out later.
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Old 11th December 2018, 08:52 AM   #52
spiggs is online now spiggs  United States
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Originally Posted by badboygolf16v View Post
I'm just building mine and have a few questions for X please...

- Is it necessary to increase C124/C134 to 1000uF as you have done in your HPA build?
Is this a good value to stick with for 32 ohm headphones as well? Any other changes beyond these caps and the parts listed at the end of the first post? Want to use the HPA version for headphones and as a pre into an ACA.
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Old 11th December 2018, 09:09 AM   #53
xrk971 is online now xrk971  United States
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You want to look at the output coupling cap, C126/136. It needs to be large enough to give you the bass extension you need. Choose the bass extension you want, say 20Hz, then halve that twice (2 octaves) or 5Hz and choose that as the -3dB frequency to strive for using f=1/(2 pi R C) where R is impedance of your headphone. So for 32ohm and 5Hz, I get 1000uF. If you wanted to make sure it digs deep, 2200uF will work well too.
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Old 11th December 2018, 04:07 PM   #54
spiggs is online now spiggs  United States
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Originally Posted by xrk971 View Post
You want to look at the output coupling cap, C126/136. It needs to be large enough to give you the bass extension you need. Choose the bass extension you want, say 20Hz, then halve that twice (2 octaves) or 5Hz and choose that as the -3dB frequency to strive for using f=1/(2 pi R C) where R is impedance of your headphone. So for 32ohm and 5Hz, I get 1000uF. If you wanted to make sure it digs deep, 2200uF will work well too.
UKA1H222MHD Nichicon | Mouser

Will 2 of these do the job?
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Old 11th December 2018, 05:30 PM   #55
xrk971 is online now xrk971  United States
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Originally Posted by spiggs View Post
UKA1H222MHD Nichicon | Mouser

Will 2 of these do the job?
Yes, perfect.
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Old 11th December 2018, 07:45 PM   #56
spiggs is online now spiggs  United States
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Yes, perfect.
Thank you. All parts as I can figure have been ordered now. Stuff coming in from all over the world for this thing. Think I got it right but I am sure a few things are missed and regardless this will be a journey for me. I apologize in advance for the questions that will be coming from this neophyte.
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Old 11th December 2018, 09:32 PM   #57
xrk971 is online now xrk971  United States
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It’s no trouble at all - if you are in the US, all the items can be bought without going outside the US.
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