| 摘要 |
A monophonic musical instrument having a variable frequency oscillator including an amplifier, a plurality of frequency determining networks whose input sides are connected to the output side of the amplifier, a tapped resistor having a plurality of taps several of which are respectively connected to the output sides of the frequency determining networks, and a plurality of switching elements each connected between each of the taps and the input side of the amplifier thus constituting a positive feed-back loop; a plurality of key switches; a latching selector having output lines respectively connected to the switching elements and associated key switches so that the closure of the key switch makes the corresponding one of the output lines to deliver a gating signal to render the corresponding switching element conductive; and circuit means for providing rising and sustaining characteristics to the output signal of the oscillator.
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