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I am trying to design a PCB circuit in altium designer.

My circuit consists of one ATmega8a, one NRF24l01 and three magnetic relays (mini relay 12V MPR-S-112-A.)

I want to set the trace width to 0.5mm (except power circuit.)

Is that correct ?

If it is wrong, what width should I use?

circuit

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    \$\begingroup\$ Saturn PCB has a handy tool for all sorts of (these things) Link \$\endgroup\$ – Tyler Aug 15 at 11:03
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0.5mm is 20mil, right? That's fine for most work at lowish frequencies.

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you can use these guidelines Guidelines or similar as a reference for a decent layout. On the right hand side of the GUI, you will find track width graphic.

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