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Amp Camp Amp - ACA
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Old 14th July 2018, 11:25 PM   #4871
Zen Mod is offline Zen Mod  Serbia
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Amp Camp Amp - ACA
balance half of your life .... then , if you like it , balance other half

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Old 14th July 2018, 11:34 PM   #4872
rnjorge is offline rnjorge  Brazil
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Great idea, ZM, Thanks! Keeping a little off balance seems a very balanced way to go. Will do just that.
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Old 14th July 2018, 11:55 PM   #4873
Zen Mod is offline Zen Mod  Serbia
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listen mono (proper L+R) at one speaker for few days , to accommodate brain

then convert to balanced mono , using both amp channels

hear can you feel difference

if yes , go for stereo
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Old Yesterday, 12:00 AM   #4874
Trismos is offline Trismos  Canada
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Originally Posted by GASCo View Post
I believe all are plenty satisfied with smps AFAIK.

Just wanted to understand the reasoning behind your question: why a 19v smps would be better than a 24v smps? Would you rather have 24v battery than a 24v smps, but you’re not concerned if the smps is 19v?
Though I read recently that the SMPS that comes with the kit is 19v, I read somewhere else (or thought I did) that it would take 24 volt. My experience with my Virtue M-901 is that a 24 volt battery supply is a superior option to SMPS. I was wondering if that might be the case here as well. I am sure if it takes 24vdc that someone must have tried it by now and has an opinion.

I also understand that Mr. Pass decided to design this kit with a SMPS because of safety concerns for people new to the kit building process, as well as to make it less complex.

At any rate, I just happen to have a fairly robust battery supply handy so this is me inquiring with the experts before I do something that may damage it.

Thanks for your replies,
Tris.
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Old Yesterday, 12:00 AM   #4875
rnjorge is offline rnjorge  Brazil
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listen mono (proper L+R) at one speaker for few days , to accommodate brain
Very good advice!
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Old Yesterday, 12:06 AM   #4876
GASCo is offline GASCo  United States
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Quote:
Originally Posted by Trismos View Post
Though I read recently that the SMPS that comes with the kit is 19v, I read somewhere else (or thought I did) that it would take 24 volt. My experience with my Virtue M-901 is that a 24 volt battery supply is a superior option to SMPS. I was wondering if that might be the case here as well. I am sure if it takes 24vdc that someone must have tried it by now and has an opinion.



I also understand that Mr. Pass decided to design this kit with a SMPS because of safety concerns for people new to the kit building process, as well as to make it less complex.



At any rate, I just happen to have a fairly robust battery supply handy so this is me inquiring with the experts before I do something that may damage it.



Thanks for your replies,

Tris.

Got it!

I believe all 1.6 complete kits are being shipped with a 24V smps.

Battery will always be the purest source but I remember reading on one of the ACA threads that there is barely any noise using a good smps in this project.
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Old Yesterday, 12:17 AM   #4877
Variac is offline Variac  Costa Rica
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Yup, 24v. Meanwell SMPS now with complete kits. But it’s listed as a separate item too, so if you have a PSU already you don’t have to buy it. Much better specs than our old (19v) supply, and much more expensive, but Nelson has tested it and it’s quieter for one thing.
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Old Today, 05:15 AM   #4878
sarathssca is offline sarathssca  India
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Hi .. could u please help with below queries regarding aca amp build .. attached couple of photos of current state ..
1. Can we use cat6 ethernet cable as in the photo .. the cat6 cable has 4 pairs of twisted wires .. I have connected 1 pair (2 individual wires) for each : input positive , input negative , output positive and output negative .. thus both input and output are going in single cat6 cable .. is it ok or do we need to have normal twisted pair cables separately for input and output ?

2. As we r using laptop power supply .. I am planning to use laptop power supply socket/holder as in the photo , so that we may use any laptop power supply directly without tampering it .. is it ok or do we need to have a different type of connection for power supply input ??

3. I am planning to have preamplifier also to be housed in the same box as this aca amp .. please suggest what type of connectors we may use for connecting input/output/power between the pre amp and main aca amp .. so that if needed we can swap preamps later ie. not to solder wires directly between them and common power supply ..
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Old Today, 05:30 AM   #4879
Extreme_Boky is offline Extreme_Boky
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Quote:
Originally Posted by sarathssca View Post
Hi .. could u please help with below queries regarding aca amp build .. attached couple of photos of current state ..
1. Can we use cat6 ethernet cable as in the photo .. the cat6 cable has 4 pairs of twisted wires .. I have connected 1 pair (2 individual wires) for each : input positive , input negative , output positive and output negative .. thus both input and output are going in single cat6 cable .. is it ok or do we need to have normal twisted pair cables separately for input and output ?
Not ok. Use a single twisted pair for each RCA input (hot and return), remove the shielding.

Use a separate "figure 8" cable for speaker output, do not run input twisted pair wiring and the "figure 8" wiring in parallel.

Quote:
2. As we r using laptop power supply .. I am planning to use laptop power supply socket/holder as in the photo , so that we may use any laptop power supply directly without tampering it .. is it ok or do we need to have a different type of connection for power supply input ??
The bigger the contact area - the better. There's around 3amps of the constant current draw from both PCB's... this requires (very) large contact area.

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3. I am planning to have preamplifier also to be housed in the same box as this aca amp .. please suggest what type of connectors we may use for connecting input/output/power between the pre amp and main aca amp .. so that if needed we can swap preamps later ie. not to solder wires directly between them and common power supply ..
I hope you did not order the ACA cases then.. they are "miniature"... and will not accommodate the SMPS brick and the pre-amp board.

I would use the headers; solder the headers onto pre-amp PCB(s), and then interconnecting wiring from the ACA PCB, power supply and RCA's straight to the headers. This will allow the fairly quick swap-overs and would eliminate contact resistance all at the same time.
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Old Today, 06:58 AM   #4880
Skylar88 is online now Skylar88  South Africa
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Quote:
Originally Posted by Extreme_Boky View Post
I hope you did not order the ACA cases then.. they are "miniature"... and will not accommodate the SMPS brick and the pre-amp board.

Doesn't look like PCB's from diyAudio store, so probably not ACA cases from the store either.
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