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You need an IN4001 diode. When Radio Shack was still around you could get one there. Here they are on Amazonhttps://www.amazon.com/Uxcell-a11092900ux0407-1N4001-Plastic-Rectifier/dp/B0087YKE02/ref=sr_1_2?ie=UTF8&qid=1475941727&sr=8-2&keywords=IN4001