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收音机发展至今,各式各样的机型层出不穷。本文介绍一套适于自制的两用新颖收音机,它既可作为时钟显示,又可收听广播,并具有按钮式电子音量控制功能,电路简单、实用而且取材容易。工作原理:整机电路见图1,主要由AM收音头,电子音量控制,低放及时钟显示部分组成。收音头由AM专用收音电路CIC7642构成,其引脚功能见图1,CIC7642输入阻抗高达4兆欧,无须
Radio development so far, a wide range of models after another. This article describes a set of homemade dual-use novel radio, which can be used as a clock display, but also listen to radio, and a button-type electronic volume control function, the circuit is simple, practical and easy to draw. How it works: The whole circuit shown in Figure 1, mainly by AM radio head, electronic volume control, low-lying and clock display part. Radio AM radio circuit by the CIC7642 form, the pin function shown in Figure 1, CIC7642 input impedance up to 4 megohms, no