语言录放处理集成电路是这几年飞速发展起来的,它的实用领域愈来愈广。这里介绍用语言录放板改制成电子留言门铃的制作方法。 1. 所需材料 QXM21电子录放板一块,“叮呼”门铃电路片一块,两极引脚的驻极体电容话筒一只,9013三极管一只,φ3红色发光二极管两只,5×5mm微型开关四只、普通门铃开关一只,13×7cm收音机外壳及扬声器一只,七芯接插件一副,七根扁平线0.5m。 Language recording and processing ICs developed rapidly in recent years, its practical field more and more widely. Introduced here with the language board to make electronic message doorbell production method. 1. The required material QXM21 electronic record board, “beep” a piece of the doorbell circuit, two pole electret condenser microphones, a 9013 transistor, φ3 red light-emitting diodes two, 5 × 5mm micro switch four Only a common doorbell switch, a 13 × 7cm radio shell and a speaker, a seven-pin connector, seven flat line 0.5m.