| 摘要 |
PROBLEM TO BE SOLVED: To provide a seesaw circuit capable of controlling a frequency characteristic with a voltage.SOLUTION: A DC voltage Vc is applied to bases of a first and a second transistors 10, 11 through high resistors 12, 13. The first and the second transistors change an AC resistor with an application voltage; therefore, a frequency characteristic changes in a seesaw manner together with a control voltage Vc. High resistors 14, 15 are provided in parallel to the first and the second transistors. This is used to keep an emitter at a midpoint potential when both the transistors are cut off.SELECTED DRAWING: Figure 3 |
