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本文介绍一种新颖的无源无线电视伴音转发器。它无需采用长距离的耳机连线,且电源取自机内,可谓一举两得。该转发器非常适合爱好者动手制作。工作原理电路如附图所示。当小插塞(CS)插入电视机外接耳机插孔时,机内扬声器被切断,电视伴音信号分为两路,一路经C10供自给电源稳压电路(见图中虚线的上半部分);另一路经C1供转发器
This article describes a novel passive TV audio transponders. It does not need to use long-distance headphone connection, and the power taken from the machine, can serve two purposes. The transponder is ideal for hobbyists hands-on production. The circuit works as shown in the figure. When the small plug (CS) is plugged into the TV jack, the internal loudspeaker is cut off. The audio signal of the TV is divided into two channels, and the power supply voltage regulator circuit is supplied by C10 (see the upper half of the dotted line in the figure). The other way through C1 for transponders