LED Switch Back Circuit

By: Joey Limonciello

-Made to disrupt power to one part of the circuit when the other turns on. Some components used in it are: -MOSFET P Channel: FQP27P06 -Diode -Capacitor: 25µF -Resistor: 100kΩ 1/2W -Load Resistor: 6Ω 50W

What is a switchback circuit?

1157 2 prong LED bulb for use in vehicles◦ Bulb uses 20 white 1210 SMD LEDs and 34 yellow

1210 SMD LEDs.◦ White LED is significantly brighter than the yellow.◦ Yellow LED array in bulb consumes 0.103 A and

white consumes 0.093 A◦ Load resistor to trick vehicle hardware.

Application

LED bulbs purchased do not operate as planned

Add onto the simple switchback circuit by adding a capacitor

Size components properly to keep the white light from turning back on while yellow is flashing.

Figure out which side of wiring to install load resistor.

Problem Statement

Multisim simulation to get a general idea of component sizes.

Build actual circuit and adjust capacitor size until time delay is suitable.

Design

Design

Design of MOSFET P

Video on flash drive

Actual circuit demonstration

Install circuit onto vehicle to address any issues

Implementation

- Rebuild circuit using wires instead of building it on the bread board.

Installation

-Remove headlight and determine which side of prong is running light and turn signal.

Installation

-Remove wire covering to expose wires. -Splice in switchback harness into existing

wires

Installation

Video on flashdrive

Demonstration

Add heatsink for load resistor Build nice sealed circuit board to hold

capacitor, resistor and MOSFET.

Future Refinement

Thanks for watching my presentation.

Questions?