Currently there is a prohibition against discussing transformerless power supplies. This is not a transformerless power supply, but instead is it s mains connected circuit. The difference being that with a transformerless power supply one might mistakenly think that the output provides enough isolation from the power line so that it would be safe to touch both its output and earth, which sometimes in not the case. In the case of a mains operated circuit, it is clear that there is a hazard.

Is the hazard the only reason we are prohibited from speaking about them? Other things we speak about are also a hazard.

 

Yes. Safety first, always.

I did not intend to hijack this thread, only to correct a minor misperception. Please return to the discussion.

 

The relay should have DC coil, since AC coils tend to limit coil current by reactance, not just resistance. I am amazed that nobody else caught that.