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Everything You Need to Know About Power Supplies

Everything you need to know about power supplies, including cables, connectors, efficiency, PFC, protections, form factors, ripple & noise, voltage stability, maximum power, virtual rails and much more.

Home » Everything You Need to Know About Power Supplies

Older Power Plugs

Contents

  • 1. Intro
  • 2. AC Connection
  • 3. Power Plugs
  • 4. Power Plugs (Cont’d)
  • 5. Older Power Plugs
  • 6. Form Factors
  • 7. Cooling
  • 8. Power
  • 9. Efficiency
  • 10. Power Factor Correction (PFC)
  • 11. Voltage Stability, Noise and Ripple
  • 12. Multiple +12 V Rails
  • 13. Protections
  • 14. Pin-Out

The two plugs described below aren’t used anymore, but you may find them while disassembling old PCs.

  • Motherboard six-pin auxiliary power connector: This connector was released together with ATX12V 1.x specification, but only a few motherboards (most notably socket 423 and early socket 478 boards) used it.
Six-pin motherboard auxiliary connector

Figure 21: Six-pin auxiliary power connector.

  • Motherboard 12-pin connector: This connector was the main motherboard connector on AT motherboards and
    AT power supplies. It became obsolete with the introduction of the ATX standard. It used two six-pin connectors and the problem was that these two six-pin connectors could be inserted on any side of the 12-pin connector found on the motherboard. In order to avoid mistakes you must install these connectors in a way that the black wires are placed on the center of the connector (see Figure 22).
AT Power Connector

Figure 22: AT power connector.

Continue: Form Factors

Power Tutorials

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Everything you need to know

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