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Old 1st June 2011, 06:30 PM   #1
juanito is offline juanito  Europe
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Question ta2020 power supply?

Can any body help me with this litlle technical issue?
I have a TA2020 amp board from Helder Hifi. I need the power suply module. I found these at Ebay:
http://cgi.ebay.es/15V-DC-3-4A-50W-R...item2308cbf40f
http://cgi.ebay.es/Universal-DC-15V-...item3efef9d9d7
http://cgi.ebay.es/Regulated-Switchi...item1c1c096e7c
At the Helder ebay site recomends a 15v DC better than 12V. Any of these are correct? if I get the "meanwell" with 15V DC + 23.2 A will it be to much??
Thanks
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Old 2nd June 2011, 05:38 AM   #2
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You really only need about 350mA to drive a single board. So, although the supplies you linked to are fine, you could probably find less expensive Meanwells to to the job.

Make sure the 15V is regulated and adjustable. You really don't want to go too high on the voltage. Find the maximum no-load voltage you will get when it's putting out 15V at full load.

Personally, I'd set it to run a little lower than 15, say 14.5V under load. A cheap voltage meter will be handy; you don't have to spend much. Whatever you find at a low price will be fine. Plus, you can never have too many cheap meters around because often you can find good use for more than one at a time.
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Old 2nd June 2011, 08:30 AM   #3
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23A is way over the top.

In general you could say that a power supply should be able to supply the maximum peak consumption (not equal to power output) of the amp.

Assuming 4 ohms speakers and 12V supply that will be (2(12^2/4)+0.06*12)/12=6.06A

But realistically that will in principle never be needed as power caps should have been configured to absorb the peak over rms performance so in effect you only need to cover the rms consumption which is ((12^2/4)+0.06*12)/12=3.06A

With 15V that number will be (15^2/4)+0.06*15/15=3.81A.

So a 3A supply will be fine for 12V, for 15V you should have a 4A supply, although the first you listed at 3.4A should probably be fine for 99% of all use.
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Old 3rd June 2011, 12:58 AM   #4
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Though that there is no voltage regulation:

take batteries - cleanest way - best sound.
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Old 3rd June 2011, 05:59 PM   #5
juanito is offline juanito  Europe
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Quote:
Originally Posted by TheDealer View Post
Though that there is no voltage regulation:

take batteries - cleanest way - best sound.
never seen that, batteries.
how??
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Old 5th June 2011, 10:50 PM   #6
juanito is offline juanito  Europe
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Quote:
Originally Posted by Johnny2Bad View Post
You really only need about 350mA to drive a single board. So, although the supplies you linked to are fine, you could probably find less expensive Meanwells to to the job.

Make sure the 15V is regulated and adjustable. You really don't want to go too high on the voltage. Find the maximum no-load voltage you will get when it's putting out 15V at full load.

Personally, I'd set it to run a little lower than 15, say 14.5V under load. A cheap voltage meter will be handy; you don't have to spend much. Whatever you find at a low price will be fine. Plus, you can never have too many cheap meters around because often you can find good use for more than one at a time.
From the picture it looks adjustable, but I asked and they don't know. They only say it's 15 Volts.
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