Is your life and safety really worth less than the cost of a transformer?Warning: An electrocution hazard exists during experimentation with transformerless circuits that interface to wall power. There is no transformer for power-line isolation in the following circuits, so the user must be very careful and assess the risks from line-transients in the users application. An isolation transformer should be used when probing the following circuits
by Don Wilcher
by Jake Hertz
by Jeff Child