Electronic – Beginner’s second PCB circuit design: AC to DC

acdcpcbpowertransformer

enter image description hereI am designing an AC to DC converter and I just want to make sure that I am so far doing the right thing — placement of components and wiring etc. — as I am a beginner.

Does this look good so far?

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This is my updated schematic and PCB.

Do the rectifiers look correct? I tried to space out 8mm for the transformer. Do the connections look good?

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How does this look like? For J4 I have a 230v appliance but no power and for J5 I have the AC 230V and a relay which acts as a switch. Relay is rated for 260v. Would this work?

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Best Answer

Per IPC spec you need creepage and clearance, even if your not using this in a product (and getting it tested at an ETL).

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Source: http://www.ni.com/white-paper/2871/en/

That means if you have AC mains running into your board, you need at least 1.6mm around the conductors that carry that voltage (meaning the hot and neutral lines) and any other conductor. This is for pollution degree 1 which for you means no dirt (stuff that could lower the conductivity of the PCB).

It's generally a good idea to place a large gap between AC and DC sides of the board for good measure. If this is a product it needs to be double insulated or made inaccessible to someone who would service it.

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