| 摘要 |
PROBLEM TO BE SOLVED: To protect amplifiers from the erroneous connection of a cable and static electricity by simple constitution. SOLUTION: Diodes 42 and 43 are connected between the output terminals of amplifiers 12, 13 and a power source line 15 on its called side to be reverse polarities with respect to a power source 37. In this case the diodes 42 and 43 have withstanding voltage where the electric charge of static electricity is discharged through a forward direction or a backward direction, and has a current capacity which resists the forward direction short-circuit current.
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