| 摘要 |
A tone control circuit used in a stereo amplifier, guitar amplifier, or the like, comprising an amplifier having a first terminal and a second terminal for delivering outputs in an opposite phase relation, a plurality of circuit branches connected across the first and the second terminals for controlling tone level in the corresponding frequency ranges, and variable elements included in said plurality of circuit branches and each having a movable contact terminal connected to the ground, so that the ratio between the load impedances connected to the first and the second output terminals of the amplifier can be varied by varying the position of the movable contact terminal on either one of the variable elements, whereby the gain of the amplifier can be controlled by varying the impedance ratio in a desired frequency range.
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