A DC connector (or DC plug, for a common type of connector) is an electrical connector designed to provide direct current (DC) power.
Compared with domestic AC power plugs and sockets, DC connectors have more standard types and are not interchangeable. The size and arrangement of DC connectors can be selected to prevent accidental interconnection of incompatible power supplies and loads. The types range from small coaxial connectors used to power AC adapters for portable electronic devices to connectors for battery packs in automotive accessories and portable devices.
There are many PC board power connectors of similar design, including the MolexMini-FitSR, MolexMini-fitjr., MOLEXMICROFIT, and MolexSABER connectors, as well as the similar-looking AMPDUAC connector.
Some plugs with three, four, five or more pins are also called DC plugs. These are common on vacuum tube devices and continue to be used when multiple voltages are provided. On vacuum tube equipment, pins are usually located on the side of the attached device for safety reasons.
Many phones use DC connectors that are unique to manufacturers or even specific phones. In a bid to improve the interoperability of mobile phone battery chargers, major manufacturers have agreed to standardise micro-USB connectors for new mobile phone chargers from 2010.
Many manufacturers make specialized DC power connectors for battery packs, instruments, medical devices, communications devices, and other devices.
PowerPack(PP) series batteries, such as PP3 nine-volt batteries, have round and hexagonal terminals that fit with "snap" connectors that have physically the same (but opposite polarity) terminals.
Special "octal" connectors with 8 or 11 pins, almost identical to octal relay sockets or tube sockets, are used to connect power to some tube audio amplifiers, transmitters, and transceivers (especially in amateur radio models). Female sockets were installed on the power supply and male sockets (with bare pins) were installed on the radio equipment. Cable assemblies with matching connectors are also readily available. These connections transmit anode positive voltage (usually 600VDC for Heathkit and 800VDC for Collins), grid negative bias (-130VDC), 6.3 and 12.6VAC for heaters (filament) and control functions (remote power switching).
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