| 摘要 |
<p>PURPOSE:To vary external synchronism and the amplitude optionally and make oscillations of a isosceles triangular wave by providing a self-excited oscillation part for performing switching between charging and discharging, and inverting and amplifying the potential of a capacitor provided between the output and a reference potential. CONSTITUTION:A DC voltage is applied from an amplitude setting part 20, and then the capacitor C4 is charged by an OP amplifier 3 when a charging/discharging changeover transistor TR9 is off, so that the output voltage B begins to drop. The TR9 turns on and off every half wave of oscillation frequency through an oscillation part 26 and when the TR9 turns on, the C4 is discharged and the output voltage B begins to rise. In this case, a resistance 21 and C22 are connected between the output waveform and reference potential in series; and the potential across the C22 has a DC deviation voltage, which is inverted and amplified by an OP amplifier 25 and applied to the bias resistance of the amplifier 3 of an integration circuit, thereby varying the deviation voltage of the C22 to 0V.</p> |
