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Proceedings Paper

Design of mine-used DC carrier telephone based on STM32
Author(s): Goufan Chen; Hui Zhou; Minhua Zhan; Jian Wang
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Paper Abstract

Abide by the design principles of mine intrinsically safe circuit, according to the need of underground communication in coal mine, the paper proposed a design scheme of DC carrier telephone which can dial. The design circuit of the telephone is introduced in detail. The telephone’s voice signals are generated by the microphone. After enlarged then the voice signals are modulated to frequency signals by LM567 chip. The frequency signals are coupled by transformer and then transmitted by 12V DC power supply line to the other voice terminals. In the voice terminal the signals are demodulated by LM567 demodulation circuit and enlarged by LM386, then, the amplified audio signals are output from a speaker. The dialing circuit is designed based on the STM32 MCU. The dial information is transmitted to the other telephone terminals by CAN bus. The measured distance calls is greater than 2000m, volume is larger than 85dB, good results.

Paper Details

Date Published: 26 January 2016
PDF: 5 pages
Proc. SPIE 9903, Seventh International Symposium on Precision Mechanical Measurements, 99032L (26 January 2016); doi: 10.1117/12.2217510
Show Author Affiliations
Goufan Chen, Anhui Univ. of Science and Technology (China)
Hui Zhou, Anhui Univ. of Science and Technology (China)
Minhua Zhan, Anhui Univ. of Science and Technology (China)
Jian Wang, Chongqing Univ. of Technology (China)

Published in SPIE Proceedings Vol. 9903:
Seventh International Symposium on Precision Mechanical Measurements
Liandong Yu, Editor(s)

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