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本文介绍的音量遥控器,可对收录机、扩音机或其它音响设备的音量进行遥控,控制距离达10m左右。它具有电路简单、制作容易、使用方便等特点。有兴趣的读者不妨一试。工作原理图1为遥控发射电路。图中,555时基集成电路构成无稳态多谐振荡器,其3脚输出一频率为2 kHz,占空比为50%的脉冲串。接在BG_1集电极的D_1和D_2为红外发光二极管。当按下开关AN时,D_1和D_2便
This article describes the volume remote control, radio, radio or other audio equipment, the volume of remote control distance of about 10m. It has the circuit is simple, easy to make, easy to use and so on. Interested readers may wish to try. Working principle Figure 1 for the remote control transmitter circuit. In the figure, the 555 time-base integrated circuit forms a non-steady-state multivibrator, and its 3 pins output a pulse train with a frequency of 2 kHz and a duty ratio of 50%. Connected to the BG_1 collector D_1 and D_2 for the infrared light-emitting diode. When the switch AN is pressed, D_1 and D_2 will be