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Old 5th August 2014, 06:52 PM   #1
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Default power supply regulator and EMI/RFI

I have this power supply 1.0uV Ultralow noise DAC power supply regulator 3.3V 5.0V 800mA - DIYINHK to power the card clock Ian,then I put the power supply side of the card in the box,without affecting the clock card (and other)or it is advisable to place the power supply and the toroidal transformer together in an external case.
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Old 8th August 2014, 06:42 AM   #2
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Best to put the power supply's output pins as close to what it powers as possible, and keep the leads from the transformer as close to identical in length as possible.

Transformer placement is a never-ending debate, and I'm not in a useful position for that one .
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Old 10th August 2014, 11:12 AM   #3
AndrewT is offline AndrewT  Scotland
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Looks like this might be a switching regulator.
All switching regulators emit interference.
This is often attenuated by enclosing the reg inside a sealed can that is secured to the chassis.

Then all the IN/OUT cables need interference filtering to complete the EMI/RFI compliance.
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Old 10th August 2014, 01:03 PM   #4
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Quote:
Originally Posted by AndrewT View Post
Looks like this might be a switching regulator.
ADM7150 is a low dropout linear regulator
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Old 10th August 2014, 01:07 PM   #5
AndrewT is offline AndrewT  Scotland
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good.
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Old 11th August 2014, 07:31 PM   #6
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The power supply is in the case of my dac next to the clock card,So, what do you recommend,I make a small box that covers the power supply,or it is not necessary.
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