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Pre-Printed Circuit Board Limits
Pre-Printed Circuit Board Limits
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Old 30th November 2019, 02:06 PM   #1
PaulyWally is offline PaulyWally
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Default Pre-Printed Circuit Board Limits

Hi All,

I have a few generic, pre-printed PCBs similar to the ones below. Question is, how much voltage/current can I expect to run through these safely?


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Old 30th November 2019, 02:12 PM   #2
Mooly is offline Mooly  United Kingdom
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Pre-Printed Circuit Board Limits
On the first board I'd say around 200 ma end to end down those long runs, less than that on the thin traces on the second board which looks to be some kind of IC holder.
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Old 30th November 2019, 03:38 PM   #3
MarcelvdG is offline MarcelvdG  Netherlands
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The KiCAD calculator can calculate these things for you when you know the sizes. The metal tracks are obviously uncoated external layer tracks. Attached are some examples.

By the way, for anything connected to 230 V AC mains, you need at least 3 mm of spacing for equipment with safety earth and 6 mm between conductor and anything you can touch without safety earth. That's because there can be nasty voltage peaks on the mains when a large load is switched off or lightning hits a high-voltage line.
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File Type: png voltageKiCAD.png (74.3 KB, 64 views)
File Type: png KiCADstroom0mm5.png (95.8 KB, 65 views)
File Type: png KiCADstroom2.png (95.6 KB, 63 views)

Last edited by MarcelvdG; 30th November 2019 at 03:44 PM.
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Old 30th November 2019, 04:01 PM   #4
indianajo is offline indianajo  United States
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The first one is a DIP board, also.
In a seaside environment, electricity can short 1000 v per inch. I'd say 32 v max between adjacent pads, maybe .032" apart? 1/32"?
The reason 1n4007, rated 1000 v piv, is such a laugh. Too short for that.
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