| 摘要 |
PURPOSE:To facilitate control and to perform stable operation in a wide band by providing one variable resistance for variable equalization control, and grounding one side. CONSTITUTION:The collector of a transistor (TR)7 is grounded through a fixed resistance 8 and also connected to the base of a TR11. The emitter of the TR7 is connected to the base of a TR13 through an impedance element 9 and its base grounded through a variable resistance 10. The collector of the TR11 is grounded and its emitter is connected to the collector of the TR13 through an impedance element 12. Its emitter is grounded through a fixed resistance 14. Then, the resistance ratio of the fixed resistance 14 to the fixed resistance 8 is equalized substantially to the impedance level ratio of the impedance element 12 to the impedance element 9, and the collector of the TR13 and the earth are led to output terminals 15 and 15'. |
