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A microphone or other device can obtain DC power from either signal line to ground terminal, and two capacitors block this DC from appearing at the output. R1 and R2 should be 6.81k ohms for "P48" 48-volt phantom. R3–6 and Zener diodes 1–4 deliberately clip the outputs to ±10v to protect a subsequent circuit from potentially large transients.
In the broadcast, film, and television industries, the 4-pin XLR connector is the standard for 12 V power. The connectors are wired pin 1 negative, pin 4 positive. Often pins 1 and 2 will be negative, 3 and 4 positive for a higher current rating. Female connectors are used as supply and male connectors are used on loads.
In 20/24-pin configurations, the Mini-Fit Jr. connector (Molex Mini-fit Jr. 39-28-1203, [7] former 5566-20A or 39-28-1243, [8] former 5566-24A) may be used on ATX motherboards as the main power connector. The same style of connector, in single or paired 4-, 6-, or 8-pin configurations, may be used for additional CPU power and graphics card ...
The outer terminal is usually GND pin and inner is V n+ is a voltage supply pin, where n voltage is 5V, 12V, 24V ... 4.65–9.3 V Nokia DC-096 ... some Hikvision 48V ...
The 13-pin version being phased in is newer, provides more services than the 7-pin, a more positive locking and also better protection against moisture and contamination. The connectors are designed for 12V systems. Exceptions for the 7-pin connector may exist where they may be used for 6V and 24V.
The de facto standard 8 inch FDD interface is based upon the Shugart Associates models SA800/801 [3] FDDs and models SA850/851 [4] FDDs. [5]: 171 The signal interface uses a 50-pin PCB edge connector which mates to a flat ribbon cable connector. Separate connectors are provided for both AC and DC power, as many 8 inch drives used AC spindle motors.