Mudcat Café Message

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User Name	Thread Name	Subject	Posted
Mitch the Bass	Tech: electrical shock danger to be aware of (51* d)	RE: Tech: electrical shock danger to be aware of	19 Oct 12
JIK, Switched Mode Power Supplies rectify the incoming mains voltage (and sometimes double the 110 to 220 so that later parts of the circuit are standard for all input voltages). This means that a smoothing capacitor at this stage will have 310 Volts on it (220 rms giving 310V peak). The high voltage DC is then chopped at 50KHz or higher then transformed to a lower voltage for subsequent rectification and regulation to provide +/-12V and +/-5V. I think the danger lies in the initial part of the circuit where lethal energy levels can persist on smoothing capacitors. MTB

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