| 摘要 |
PURPOSE:To offer a stabilizing circuit which has simple constitution and good stability, and is capable of varying easily an output, by using a digital IC to which a stabilized prescribed power supply voltage, and also whose output amplitude is determined by the power supply voltage. CONSTITUTION:A sine wave of an input terminal 3 is converted to a square wave whose duty ratio is constant, by a waveform converting circuit 8 and inputted to a digital IC9. The voltage of an H level and an L level of an output of the IC9 is varied by depending on the power supply voltage in case when a load current is small, and a variation of the power supply voltage of a regulated power supply 11 is suppressed sufficiently, therefore, an output amplitude of the IC9 becomes a constant value corresponding to a voltage level of the power supply 11. Accordingly, a square wave having a constant duty ratio, which is inputted to the IC9 holds a constant amplitude corresponding to a prescribed voltage of the power supply 11, and an output of a filter 10 also becomes a sine wave of a constant amplitude. |
