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在收音机或录音机输出级接扬声器的一端(非地端)和调节音量的电位器一端(非地端)各引一细导线至机外,在两导线(A、B)间串接适量阻值的电阻,按附图电路装入自制琴或玩具琴即成。由于各种收音机电路结构及参数各不相同,故附图中R_1～R_(21)各电阻未标出阻值,读者可在1～10kΩ间选取各电阻,其方法是:开启收音机电源,将音量电位器调至较大位置,调谐电容器全部旋进或旋出(无干扰信号)。用测试棒代替琴键,取一台音阶比较准确的电子琴
Connect a thin wire to the outside of the machine at one end (non-ground) of the output stage of the radio or recorder and one end of the potentiometer (non-ground) for volume adjustment. Connect the appropriate resistance between the two wires (A, B) Resistance, according to the circuit diagram into the piano or homemade piano Serve. As a result of a variety of radio circuit structure and parameters vary, so the picture R_1 ~ R_ (21) of the resistance is not marked, the reader can choose between 1 ~ 10kΩ resistance, the method is: turn on the radio power, the The volume potentiometer is adjusted to a larger position, and the tuning capacitor is all screwed in or out (no interference signal). Instead of using the test bar keys, take a scale more accurate keyboard