9V USB LED Bulb.

176

01:54:53

This circuit is used to light up USB bulb with 9V battery. 

input:
* 9V rechargeable Battery,  300mA

Description :
220ohm resistor is on the circuit. 130ohm is fixed with LED. both (130ohm+LED) are inside the USB bulb. 
9V is connected by Snap. 

Result :
The bulb light up for 2hr. after which it brightness will come down. 

Edited:

published 10 years ago

2ctiby

10 years ago

Most LED bulbs should not have more than 20mA current running through them. They are also designed for just over 2 Volts. They may burn out quickly if you exceed that. Try increasing the resistor value and watch how the 30mA drops down to a better level. The lower the mA the longer your battery will last, but if you make the mA current too low then you won't have any light. I put an LED in to an outside doorbell pushbutton with a resistor in line like yours. I used a 200k ohm resistor and it ran from a little 12 v battery in the bellpush. It lasted about one month. The LED was only just visible through the white doorbell plastic in the dark, but it let callers know where the bell was in the dark. Have fun and keep an eye on the mA at your LEDs.

jorteron

10 years ago

this use was to make a portable light bulb. so 9V was chosen. the resistor has been changed to 220ohm.

jorteron

10 years ago

the LED is actually SMD LED.

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