Usb Reading Lamp Circuit - led lighted 5x 10x magnifier desk l 40 led magnifying l magnifier adjustable light desktop magnifier desk l for hobby crafts inspection reading books newspapers jewelry sewing 1 p div class b factrow b twofr div class b vlist2col ul li div price 12 59 div li ul ul li div availability in stock div li ul div div div li power saving led l from your scrap box this circuit is designed by mr seetharaman subramanian and we are very glad to publish it here in this article he is showing a method to convert a broken defunct cfl into a led based power saving light this is the simple version of a white led l that can be directly powered from mains it can give le light even for reading purpose capacitor cx along with diodes d1 through d4 forms the ac step down circuit 2 automatic led emergency light note considering the doubts raised by many of our valuable readers in our ments section this circuit has.

been modified by usb input output board is a spectacular little development board parallel port replacement featuring pic18f2455 pic18f2550 microcontroller span class news dt 22 08 2017 span nbsp 0183 32 a while ago marco mounted a powerful laser diode to a cnc machine in an attempt to etch copper clad board and create a few pcbs the results if the earth ground prong of a 3 prong plug is clipped or missing replace the plug many of these plugs were clipped because some older locations where games were placed only had two prong outlets description the streamlight microstream 174 usb flashlight is an extremely pact personal flashlight with 2 brightness levels new colors now available hi this is my first instructable so go easy on me so i am going to show you how to power nearly anything off a usb port this is for the usb petition usb runs at 5v this project is a solution to power up most.

of devices or projects requiring dual adjustable power supply the circuit is based on lm317 positive and lm337 negative voltage regulators



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