Audio Signal Modulation of a LED

BY:

M ITCHELL SENGER

KARTHIKVEL RATH INAVEL

YUT ING X I

Outline Background

Modulation

Design Approach

Signal Analysis

Observations and Results

Questions

LED Modulation

(Source: Palaris Page125)

Summing Amplifier

Design Approach

Signal Analysis• Input Signal

• Modulated Output Signal

•Transmitted Across Phototransistor

Input Signals

Modulated Output Signal

Transmitted Output Signal

Observations and Results 1. Modulated Voltage and Current Signal Across LED

2. Transmitted Signal Strength is low. Current amplifier can be used to solve this problem 3. Successful audio transmission through modulation