| 摘要 |
<p>PURPOSE:To prevent a power from being wasted unwillingly by stopping the supply of an alternating power source to the primary side coil of a transformer at the time of instructing the stop of the supply of a direct current power source to a main body to a power source control circuit. CONSTITUTION:At the time of pressing a push switch 3 when the DC power source is not supplied to the main body, an input terminal 6a is connected through a contact 3a of the push switch 3 with the primary side coil of a transformer 1, and a 100V alternating power source is supplied to the primary side coil of the transformer 1. At the time of pressing the push switch 3 again, a power source control circuit 5 stops the supply of the DC power source to the main body, and stops the supply of the DC power source to a coil 4a of a relay 4. Thus, the contact 3a of the push switch 3 and a contact 4b of the relay 4 are opened, so that the supply of the 100V AC power source to the primary side coil of the transformer 1 can be stopped.</p> |
