The LED suggested circuit powered by ordinary AAA batteries

Published:2011/6/20 9:40:00 Author:Fiona | Keyword: The LED suggested, powered by ordinary AAA batteries | From:SeekIC

When the battery voltage is 4.38V,the measured current is about 150mA, LED's voltage drop is 3.2V. In order to effectively extend battery using time, the writer decides to cascade a small value of current limiting resistor behind the button switch K, after the repeated test,the current is 120mA when using 2.7Ω resistor,the brightness is no significant change. If it is too expensive,the circuit can use 220V AC power which requires a suitable power adapter,the writer suggests to choose the abandoned mobile home battery charger, because the mobile phone chargers plug have various different shape,it should be transformed by mono headphones plug in advance,output voltage of the charger which is found by the writer is 6.28V.



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