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I am trying to know what is the black circular component stacked in front of the switch and adjacent to the large capacitor in this circuit board.

I am not talking about the transistor with the heat sink. I am talking about the circular black component.

This thing has 4 pins in the bottom.

enter image description here

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    \$\begingroup\$ Bridge rectifier. Pins should be labelled ~ ~ + -. \$\endgroup\$ – Brian Drummond Oct 26 '14 at 15:46
  • \$\begingroup\$ close up photo of that component showing the labelling is probably necessary. \$\endgroup\$ – placeholder Oct 26 '14 at 15:48
  • \$\begingroup\$ mccsemi.com/PDF/BridgeRectifiers.pdf \$\endgroup\$ – Ignacio Vazquez-Abrams Oct 26 '14 at 15:55
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    \$\begingroup\$ 400V PIV 1.5A bridge rectifier. \$\endgroup\$ – Spehro Pefhany Oct 26 '14 at 16:01
  • \$\begingroup\$ And by the way it's not "a transistor with heat sink", but a 7805 linear voltage regulator (5V). \$\endgroup\$ – Majenko Oct 26 '14 at 16:44
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This element is a bridge rectifier. The two oposite pins are AC input (designated with ~ ) and the other two are DC output (designated with + and - ).

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That is rectifier of 4M ohm. + and minus labels are DC output. ~ labeled pins are AC input. Keep + on top and - at bottom then right side ~ is Phase and left side is Neutral.

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