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Class D Switching Power Amplifiers and Power D/A conversion

Allo volt+d custom powersupply, and am questions
Allo volt+d custom powersupply, and am questions
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Old 6th September 2020, 09:53 AM   #1
Xqzme is offline Xqzme  Denmark
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Join Date: Jan 2014
Default Allo volt+d custom powersupply, and am questions

Hello!
I've just bought the Volt+d, and will be using it with my B&O RL60.2(so far so good).


I'm not the biggest fan of the translucent case it comes in, and would rather make a nice wooden/brass box to fit it inside. I'm also considering making an on/off switch, and put in a nice toroidal ring transformer I have salvaged from some quality gear, which both have a 12v and 24v output.


My question is, could I connect the transformer right to the amp, or should I put anything in between ?


Would a toroidal transformer be better or worse than a laptop power supply?


Should I shield the amp from the transformer ?


And finally, how would I know which settings I should use for the AM bandwidth avoidance circuit..
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Old 6th September 2020, 10:02 AM   #2
Yatsushiro is offline Yatsushiro  France
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A transformer provides AC voltage, your amp requires DC voltage; do not connect them directly.
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Old 6th September 2020, 10:05 AM   #3
Xqzme is offline Xqzme  Denmark
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Thank you, could probably have found out looking at the transformer first.. Anything important to look for in a conversion module ?
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Old 6th September 2020, 10:32 AM   #4
Yatsushiro is offline Yatsushiro  France
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Join Date: Mar 2016
Location: Normandie, France
You need a full wave rectifier, but need to watch out for ripple and rectified peak voltage (The Volt +D has an absolute max of 30v)

Someone far more knowledgeable than me will come along shortly, but in the meantime:

Full Wave Rectifiers | Electrical4U
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Old 6th September 2020, 10:44 AM   #5
Xqzme is offline Xqzme  Denmark
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Thank you Yatsushiro, that was some of the most educational I have read on a Sunday!
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Old 7th September 2020, 01:14 AM   #6
jasonhanjk is offline jasonhanjk  Malaysia
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Join Date: Jun 2004
Location: Singapore and Malaysia
The no load peak voltage after rectify must not exceed 30V. You need a scope to check it.

Otherwise just get a 24V 3A SMPS.
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