| 摘要 |
Power source control circuitry for an automotive portable radio telephone (20) which is powered by a power source mounted on a motor vehicle via an adapter (30). When the telephone is mounted on the adapter, power is fed from the on-board power source (10) to the adapter and telepthone. When the telephone is removed from the adapter, the adapter is disconnected from the battery to eliminate wasteful supply of power from the power source to the adapter. <IMAGE> |
