| 摘要 |
<p>A constant-voltage power source device for a highly accurate electric circuit, connected to an A.C. power source, capable of minimizing size of the current loop, making the ground line current constant even when the load current varies, and having a high noise elimination ratio as well as a low output impedance.</p><p>The device comprises a constant-current circuit (28) connected in series with the load (26), and in parallel therewith a constant-voltage circuit t30) including a control amplifier (44) which controls the current (I<Sub>c</Sub>- 1<Sub>0</Sub>) flowing therethrough so that sum of this current and the output current (l<Sub>o</Sub>) of the device supplied to the load (26) equals to the output current (l<Sub>c</Sub>) of the constant-current circuit (28).</p><p>The device is particularly suitable for an audio video recording/reproducing apparatus or a measuring instrument, and can be used instead of a battery power source which, until now, has been considered to be ideal for such purposes.</p> |
