USB Lamp Circuit
Description.
Here is a simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the 5 Volt available
from the USB port. The 5V from the USB port is passed through current
limiting resistor R2 and transistor Q1. The base of transistor Q1 is
grounded via R1 which provides a constant bias voltage for Q1 together
with D2.The diode D1 prevents the reverse flow of current from
battery.C1 is used as a noise filter. Two white LED’s are used here for
the lamp, you can also use a 2 V torch bulb instead of LED’s. LED
D3 indicates connection with USB port.
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