Variable Low Power FM Transmitter for use with Portable Audio Player. Communication Electronics – Dr. Pao-Lo Liu TA – Mr. Saurav Bandyopadhyay Jason Burgess Kee Soon Lim Terry Hudson. Objectives & Goals.
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Communication Electronics – Dr. Pao-Lo Liu
TA – Mr. Saurav Bandyopadhyay
Kee Soon Lim
Fig 1. The schematic of the final design.
The Pre-emphasis circuit
The amplifier circuit
The oscillator circuit
Fig 2. Picture of the bread boarded circuit.
*The analysis was conducted with use of a Clarion DXZ735MP receiver, the specs are listed below.
Fig 3. Output at 100 Hz
Fig 4. Output at 30 Hz
Fig 5. SNR data
SNR=20 log (Vs/Vn)
Figure 6- The output from the transmitter with the pre-emphasis. The –3 dB points are 85Hz, 14.5 kHz. The bandwidth is then 14kHz.
Figure 7- The output from the transmitter with out the pre-emphasis. The –3 dB points are 80 Hz, 9.3 kHz. The bandwidth is then 9.2 kHz.
Time Line Audio Player
 Electronic Communications Systems 5th ed., Tomasi, Wayne, Prentice Hall, 2003