| 摘要 |
PURPOSE:To prevent noise from being outputted as sound with simple circuit constitution and to protect the circuit and load from noise or malfunction by utilizing a DC protection circuit provided on an audio equipment for the protection of a speaker and the circuit as it is so as to protect the disconnection/ coupling of a control information storage body. CONSTITUTION:Circuit components are arranged splittingly to both an amplifier main body 1 and the control information storage body 2 and when the main body 1 and the storage body 2 are separated, part of components R1-R3 of the circuit components form a DC bias circuit applying a DC voltage to the input of a DC protection circuit 13. When the main body 1 and the storage body 2 are coupled, a power voltage division circuit applying a substantially zero voltage to the input of the DC protection circuit 13 is formed in place of all circuit components arranged splittingly, parts P21, P22, P28, P29 of connection terminals of the storage body 2, terminals P11, P12, P18, P19 of the main body 1 corresponding to the said terminals and the DC bias circuit. Thus, the output of noise as sound is prevented with simple circuit constitution and the circuit and load are protected from noise and malfunction. |
