| 摘要 |
PROBLEM TO BE SOLVED: To provide a television intercom with a built-in power source inverse connection protecting circuit, which supplies power without a loss in supply voltage when a television intercom is normally connected with a power source adapter, and protecting an inside electronic circuit at the time inverse connection, in a television intercom device with an outside power source adapter system. SOLUTION: Relating to a television intercom 2, a voltage from a power source adapter 5 is supplied to an electronic circuit 2b without a loss in a when the television intercom is normally connected with the power source adapter 5 by a relay contact 3a inserted between a power source terminal 2a and the electronic circuit 2b, and at the time of power source inverse connection, the power source terminal 2a is separated from the electronic circuit 2b by the relay contact 3a so that a damage to the electronic circuit 2b can be prevented.
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