THF160型对讲机体积小巧,携带方便,并具有静噪功能。但彼此联系时需反复呼叫,笔者为该机添加了呼叫振铃功能,使该机使用更为方便。本电路采用了电话振铃集成电路DHL(浙江温州市丰华电子有限公司产品)。该电路型号为HFC1500(图1)。振铃信号从B脚输出,C脚输出放大的振铃信号。当在②脚加上一个3V的触发电压 THF160 walkie-talkie compact size, easy to carry, and has a mute function. However, contact with each other to be repeated calls, the author added a call ringing function for the aircraft to make the aircraft more convenient to use. This circuit uses a telephone ringing integrated circuit DHL (Wenzhou City, Zhejiang Fenghua Electronics Co., Ltd. products). The circuit model HFC1500 (Figure 1). The ring signal is output from B pin, and C pin outputs the amplified ring signal. When the ② feet plus a 3V trigger voltage