Abstract
The reasons of using low-pressure mercury lamp as transmitter light source are analyzed. The principle of how the resonant half-bridge switching circuit works is described, and how to use this circuit to achieve 2FSK modulation is discussed. The L6384 chip modulation circuit is briefly introduced. The response performance of low-pressure mercury lamp is tested under the conditions of gradually increasing the transmission rates. The new transmitter has a longer transfer distance but a slower response compared with LED transmitter system.
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