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ACA V1.5 Illustrated Build Guide
ACA V1.5 Illustrated Build Guide
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Old 19th June 2018, 04:20 AM   #381
6L6 is offline 6L6  United States
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ACA V1.5 Illustrated Build Guide
Quote:
Originally Posted by freejazz00 View Post
Also, I believe that right speaker output wire should be in the left (red) post.
Nope.

In order to be bridged the speaker has to be attached to both channel’s outputs, one of them running backwards... the red posts are not the outputs, but ground, so if you did that, you’d be using only one channel, and get standard power to the speaker, not the additional power from bridging.
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Old 28th July 2018, 04:51 PM   #382
olderthandirt is online now olderthandirt  United States
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Default ACA 2U mini dissipante layout

6L6 Thanks for this awesome build thread! Hopefully this is not off topic. But my daughter and I are building a non ACA undrilled standard chassis for this project. We would like to drill and tap prior to the parts kit arrival. We want to complete the amp before she goes back to school. Does anyone have a back panel layout with dimensions or the 2U UMS pattern for the heat sinks?
Thanks
Kevin
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Old 29th July 2018, 06:06 PM   #383
olderthandirt is online now olderthandirt  United States
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Default Has anyone received their ACA Chassis?

I am hoping someone who has received the ACA chassis would verify some dimensions. Here are our rear panel hole diameter estimations. And have enclosed rough sketches of the distance measurements needed. Thanks for your help.

Hole Diameter
Neutrik 15/16”
Speaker post 7/16
RCA post 3/8
On/off switch ¼
Power plug 7/16
LED ?
Attached Images
File Type: jpg ACA V1.6 Heat Sink.jpg (544.6 KB, 414 views)
File Type: jpg ACA V1.6 Rear Panel.jpg (517.8 KB, 410 views)
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Old 10th August 2018, 12:54 AM   #384
73 and a 3rd is offline 73 and a 3rd  United States
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Not sure if this is the right place to ask but could someone please direct me to a bill of materials for the 1.6 kit? I don't understand why this does not come with it. I am trying to verify my kit complete before beginning my build. Thanks in advance!

Last edited by 73 and a 3rd; 10th August 2018 at 01:01 AM.
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Old 10th August 2018, 11:15 AM   #385
olderthandirt is online now olderthandirt  United States
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I found this on page 3. Also you can use the schematic.
It appears that everyone is using the original ACA thread for the 1.6 build.

Quote:
Originally Posted by exw9 View Post
awesome, thanks! i also made this table, maybe it will also be helpful:


R2 .47 3W
R3 .68 3W
R4 .68 3W
R5 100
R6 100
R7 10k
R8 1K
R9 1K
R10 332K
R11 10K
R12 39.2K
R13 10k
R14 1K
R15 2.21k
C1 3300
C2 1000
C3 10
C4 10
Q1 IRFP240
Q2 IRFP240
Q3 ZTX450
Q4 2SK170
P1 5K
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Old 10th August 2018, 11:48 AM   #386
olderthandirt is online now olderthandirt  United States
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Quick and dirty BOM. Hopefully no errors.

R1-R11 and R13-15 (2)
R12 (3)
C1-C4 (2)
Q1-Q4(2)
P1 (2)

Last edited by olderthandirt; 10th August 2018 at 12:08 PM. Reason: Incorrect
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Old 5th September 2018, 07:02 AM   #387
jackhsu is offline jackhsu  Taiwan
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Just wondering if it's possible to go higher than 24V? If so, how high can we safely go?
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Old 5th September 2018, 11:17 AM   #388
Zen Mod is offline Zen Mod  Serbia
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ACA V1.5 Illustrated Build Guide
48 , why not?

though, with few resistor value changes
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Old 5th September 2018, 12:27 PM   #389
nycavsr2000 is offline nycavsr2000  United States
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ACA V1.5 Illustrated Build Guide
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Originally Posted by jackhsu View Post
Just wondering if it's possible to go higher than 24V? If so, how high can we safely go?
As ZenMod has said above. And don’t forget to account for the increased dissipation, so capacitors and resistors will have to be changed.

And remember a few things:

You generally don’t want to exceed 1/2 the max dissipation of said device. Max dissipation of the IRFP 240 MOSFET is 150 watts. So 75 watts max.

Dissipation at +48V supply at a current of 1.45A is ~ 70 watts.

And of course your heatsink will have to be much larger.

Yes, it’s a new design, but not impossible

Best,
Anand.
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Old 5th September 2018, 12:39 PM   #390
Eric is offline Eric  United States
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ACA V1.5 Illustrated Build Guide
As your power supply gets much higher than 30v or so, you'll be increasingly likely to fry that little 2SK170 guy that we depend on. Its only protection is R9.

If you want that much more power, move to a more powerful design - lucky for us, we have plenty to choose among!
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