# USB LED 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. ## Project Details - **Owner:** jecstronic - **Created:** 9/19/2021 - **Last Updated:** 9/19/2021 - **Visibility:** Public - **Copies:** 1 ## Key Components ### ? — [+3V3 Power/Voltage](https://www.flux.ai/adrian95/plus3v3-powervoltage.md) **Pins:** - +3V3 ### BT1 — Multi Cell Battery - Number of Cell: 2 - Max Voltage per cell: 1.2V **Pins:** - ANODE - CATHODE ### D1 — [LED](https://www.flux.ai/jharwinbarrozo/led-tht.md) - Saturation Current: 93.2e-12A - Forward Voltage: 1.70 - Series Resistance: 0.42Ω - Emission Coefficient: 3.73 - Breakdown Voltage: 0V **Pins:** - ANODE - CATHODE ### D2 — [PN Junction Diode](https://www.flux.ai/jharwinbarrozo/pn-junction-diode.md) - Emission Coefficient: 2.00 - Saturation Current: 1.88e-9A - Breakdown Voltage: 50V **Pins:** - ANODE - CATHODE ### D3 — [LED](https://www.flux.ai/jharwinbarrozo/led-tht.md) - Breakdown Voltage: 0V - Emission Coefficient: 3.73 - Forward Voltage: 1.70 - Series Resistance: 0.42Ω - Saturation Current: 93.2e-12A **Pins:** - ANODE - CATHODE ### D4 — [LED](https://www.flux.ai/jharwinbarrozo/led-tht.md) - Breakdown Voltage: 0V - Emission Coefficient: 3.73 - Forward Voltage: 1.70 - Series Resistance: 0.42Ω - Saturation Current: 93.2e-12A **Pins:** - ANODE - CATHODE ### D5 — [PN Junction Diode](https://www.flux.ai/jharwinbarrozo/pn-junction-diode.md) - Breakdown Voltage: 50V - Saturation Current: 1.88e-9A - Emission Coefficient: 2.00 - Series Resistance: 0.0286Ω **Pins:** - ANODE - CATHODE ### J1 — [USB micro](https://www.flux.ai/vasyl/usb-micro.md) - Part Type: Сonnector **Pins:** - D- - D+ - GND - V+ ### Q1 — [PNP Transistor](https://www.flux.ai/jharwinbarrozo/pnp-transistor.md) - Beta / hFe: 100 - Leakage Current: 1e-13A **Pins:** - B - C - E *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jecstronic/usb-led-lamp-circuit](https://www.flux.ai/jecstronic/usb-led-lamp-circuit).* --- *Generated from [https://www.flux.ai/jecstronic/usb-led-lamp-circuit](https://www.flux.ai/jecstronic/usb-led-lamp-circuit)*