I think 2 more issues would improve the safety…
a. Move the LED and R more to the input side of the opto coupler, further away of pin 4.
b. Make a slot below the opto coupler to seperate low - high voltage part.
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I like them both. Consider them incorporated.
Here’s what the finished article looks like. PWM on channel four giving dimmable light control. Channels 1-3 use zero-crossing triac for simple on-off. Channel four has random phase to allow finder control over PWM.
Thanks to all for you help. I’m really pleased with the board. :dance:
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@ Jason - Nice work Jason 
Do you have one or two for sale?
@ RobvanSchelven - I have four boards spare at present. I only ordered ten and a couple have already found their way to a good home.
I have also uploaded the gerbers and schematic to TurnKey here https://www.turnkeyassembly.com/project/65 in case anyone wants to make their own. If demand is higher than I expected then I will order some more.
If you’d like one or two they are $10/€10 each plus shipping.
Let me know and private message me your details.
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