In this video I build this month’s Kipkay Kits DIY LED Light Bulb. It consists of an array of 38 white LEDs, a full bridge diode rectifier circuit along with other passives. All of the LEDs are in series so just one bad solder joint will prevent it from working. At the very end of the video I have a diagram on how I was testing the array to verify it was working by touching the adjacent LED leads.
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Kipkay LED Light Bulb build video by David Fries