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| ESP8266 with relays |
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| picandmix:
Hi, Not trying to put your design down in any way, quite the reverse, am trying to be helpful, so would urge you to first build a one off prototype of your complete design on some form of soldered wiring board before sending off for a pcb. Its so easy to miss something in your design and a test build connected to whatever you are powering will soon show up such potential problems, if any. |
| hsn93:
your mounting holes.. need clearance screw head will touch your components. --- Quote ---How much isolation do I need (or should I have)? Is 0.5mm enough? --- End quote --- i would target 2mm if no distance 1mm. look for "clearance vs creepage" http://www.smpspowersupply.com/ipc2221pcbclearance.html |
| Gabriel:
--- Quote from: picandmix on December 26, 2018, 11:46:34 am ---Hi, Not trying to put your design down in any way, quite the reverse, am trying to be helpful, so would urge you to first build a one off a prototype of your complete design on some form of soldered wiring board before sending off for a pcb. Its so easy to miss something in your design and a test build connected to whatever you are powering will soon show up such potential problems if any. --- End quote --- I'm sorry if I came across rude to you... I was just trying to give the reasons behind my decisions. I have prototyped it out roughly and it all seemed to work fine. But I don't have the exact parts so its only approximately what will be going on to the PCB. |
| Nusa:
Just remember mains aren't under your control. If it's 240V nominal, plan clearances for tolerating 1000V spikes as a minimum. They may only be microseconds long, but it doesn't take much to destroy your low voltage stuff if the clearance isn't there. |
| Nusa:
Also remember to think in 3 dimensions. a 240V mains trace going under a surface-mount resistor isn't going to cut it clearance-wise. |
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