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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 19th July 2018, 10:07 PM   #4911
deathtube 667 is offline deathtube 667
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Default Question for Nelson Pass: ACA circuit boards

I have some ACA circuit boards, but I am not sure if they are earlier versions or copies authorized for discussion on this forum.

Can you review the attached photos and let me know if I am permitted to discuss these ACA boards and my project on this forum?

I have gone to the store but the "official" ACA boards are always sold out, so this is my last hope of presenting my project here.

dt 667
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Old 20th July 2018, 06:07 PM   #4912
Derekva is offline Derekva  United States
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Quote:
Originally Posted by deathtube 667 View Post
I have some ACA circuit boards, but I am not sure if they are earlier versions or copies authorized for discussion on this forum.

Can you review the attached photos and let me know if I am permitted to discuss these ACA boards and my project on this forum?

I have gone to the store but the "official" ACA boards are always sold out, so this is my last hope of presenting my project here.

dt 667
These don't appear to be DIYAudio ACA boards, although the layout appears quite similar - I can't comment on whether or not you are permitted to discuss them, however.

-D
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Old 20th July 2018, 09:21 PM   #4913
deathtube 667 is offline deathtube 667
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Quote:
Originally Posted by Derekva View Post
These don't appear to be DIYAudio ACA boards, although the layout appears quite similar - I can't comment on whether or not you are permitted to discuss them, however.

-D
It was suggested to me to ask Mr. Pass for permission to discuss my ACA circuit board and project since it is his forum.

I will wait for his reply and judgement on this matter before trying to post anything.

dt 667
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Old 21st July 2018, 05:35 PM   #4914
Nelson Pass is offline Nelson Pass  United States
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Amp Camp Amp - ACA
I don't care.

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Old 21st July 2018, 06:16 PM   #4915
deathtube 667 is offline deathtube 667
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Originally Posted by Nelson Pass View Post
I don't care.

Thank you, Mr. Nelson Pass.
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Old 21st July 2018, 06:20 PM   #4916
adason is offline adason  United States
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Just ask ZM, local knowitall
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Old 21st July 2018, 06:27 PM   #4917
Zen Mod is offline Zen Mod  Serbia
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Old 21st July 2018, 09:42 PM   #4918
deathtube 667 is offline deathtube 667
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Default DIY ACA project : measurement data & photos ...

With the approval of Nelson Pass, I can finally present my DIY ACA project.

The power supply features an AnTek AS-2218 PT with dual 18V secondaries.
FWBR into CLC filter with 44,000uF per channel.

The mosfet heatsinks are 2" x 2" 1" thick aluminum bar stock with some aluminum angle pieces for additional cooling. This keeps the heatsinks operating within 25C of ambient temperature measured after 1-2HRS.

THD +N @ 1W = 1.5%, 2W = 3%, 3W = 4.75% with 1KHz test signal.

Power Out before clipping was 3.5W.

Square waves looked perfect at 1KHz & 10KHz.

Subjectively, I enjoy this ACA project on Altec 2-way horn speakers.
The sound is very tube-like with its 2nd order dominant harmonic profile.


dt 667
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Old 21st July 2018, 11:35 PM   #4919
adason is offline adason  United States
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So what's wrong with it?
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Old 22nd July 2018, 05:29 AM   #4920
sarathssca is offline sarathssca  India
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Finally assembled and got the amp sing ..

- no thump sound at power on or off .. it's smoothly starting and stopping ..

- finally used 4 strands of cat-6 cable for each output positive and negative on one side.. my soldering job little ordinary only

- I couldn't get the bolt/connectors for mounting the board and MOSFETs on the heatsink as in other aca builds here .. I have used normal screw and nuts for this as in photos but faced difficulty in properly fitting the board and MOSFETs. Needed to put the screws from behind the heatsink and put the bolt on top as I couldn't put the bolt behind the heatsink .. also the holes for MOSFETs and PCB were not properly aligned as my heatsink has horizontal fins ..

- my heatsink r of size 190mm *95mm *33mm.. is it ok .. while running it's getting very very hot .. i haven't done any mod and these r running on 19v 90w power supply.. do I need to use bigger heatsink or small fan or another additional heatsink and fix it over these 2 heatsinks ..

- volume out of the alpair 7p speakers r coming little less only .. current volume is ok for near field .. now need to run these to break in the alpair 7p drivers
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