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Another type of cassette adapter is the Bluetooth cassette adapter. It has the shape of a standard cassette, but has a built-in audio Bluetooth receiver module, a simple power supply to allow charging and power and a small battery. Usually, they may power on when the cassette player is set on play, and power off when the cassette player is stopped.
The voltage of the power outlet is usually near 12 V DC, and may be elevated between 13.5 V to 15 V while the engine is running. On trucks, the voltage of the power outlet may be near 24 V DC. The 12 V power circuit is protected by a car fuse, often rated at 10 to 20 amperes, which provides 120 to 240 watts of power. Large appliances such as ...
In the early 21st century, compact digital storage media – Bluetooth-enabled devices, thumb drives, memory cards, and dedicated hard drives – came to be accommodated by vehicle audio systems. Around this time auxiliary input jacks and USB ports were added to connect MP3 players to the vehicle's speakers.
USB Battery Charging (BC) defines a charging port, which may be a charging downstream port (CDP), with data, or a dedicated charging port (DCP) without data. Dedicated charging ports can be found on USB power adapters to run attached devices and battery packs. Charging ports on a host with both kinds will be labeled. [52]
Although the nominal voltage of a 12 V lead acid battery is 12 V DC, when the engine is running the car's battery charging system will bring the system voltage to 13.8 V DC or higher. [10] The possible range of battery voltages from 11–15 V DC must be taken into account by devices attached to the cigar lighter socket.
Rapid charging results in even faster recharge times and is limited only by available AC power, battery type, and the type of charging system. [21] Onboard EV chargers (change AC power to DC power to recharge the EV's pack) can be: Isolated: they make no physical connection between the A/C electrical mains and the batteries being charged. These ...