Components : (From eBay)
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1 - transformer 220 VAC to 12.8 VAC. 3A 5 .0 $
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4 - 1N5822 diode. 0.3 $
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1 - 2200uF electrolytic capacitor. 0.2 $
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1 - Voltmeter/Ammeter display. 4 $
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1 - 5 mm led of any color. 0.1 $
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1 - resistor 1 K Ohm . 0.1 $
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1 - SPDT on-off switch 6 amp. 0.3 $
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1 - PCB 60X40 mm 0.3 $
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2 - Female banana plug (black & white) 0.6 $
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TOTAL ................................................................................ 10.9 $