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This a magazine readers contribution. Like all contributions you have to assume they weren't tested by magazine staff. To me it appears to need power supply RF blocking choke and a buffer stage to raise the oscillator output for use.
It is the old story. Once a circuit has been built, get the volt meter out and check supply voltage and the various components input and output voltages.
AC ground connection ? Don't know what mains system you have?
As a NZ registered Electrician I would be connecting a proper mains rated relay contacts in this method ..
phase to one of the relay contacts, the other contact to the load device, the other side of the load device to neutral.
What...
You are feeding your 5 volt regulator from the 12 v supply through the led and it's current limiting resistor, that will cause all sorts of problems by limiting the supply to 12 ma (approx). That will cause supply voltage variation and associated micky mouse problems!
Any +ve power supply...
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