| 摘要 |
A DC power supply device for use with a video tape recorder with a built-in camera has a plurality of power supply blocks for supplying a plurality of voltages, each of the power supply blocks being composed of a switching circuit for being supplied with a DC voltage and a smoothing circuit connected to an output terminal of the switching circuit. The power supply blocks are mounted on a multilayer circuit board which includes a layer of a ground pattern with an electric conductor extending substantially fully thereover, the ground pattern being separated into a plurality of ground pattern portions by a plurality of recesses defined therein, the power supply blocks having respective ground terminals connected to the ground pattern portions, respectively. The multilayer circuit board may comprise at least a layer for mounting electronic parts thereon, a layer having a signal line pattern thereon, a layer having a power supply line pattern thereon, in addition to the layer of the ground pattern, and a plurality of insulating layers electrically separating and mechanically joining the layers.
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