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ATX is the standard for PC power supplies. It has +3.3 V, +5 V, and +12 V. They share a common ground. It has a PS_ON# signal which needs to be grounded to turn it on. Don't open power supplies that run on line voltage (AC). They have dangerous voltages and currents inside

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How can I use an ATX power supply for my own experiments?

/Convert-an-ATX-Power-Supply-Into-a-Regular-DC-Powe/ http://www.instructables.com/id/Yet-Another-ATX--Lab-Bench-Power-Supply-Conversion/ http://www.mbeckler.org/powersupply/ http://www.marcee.org/Articles … /PCPowerSupply.htm They show several projects where people used ATX power supplies for home experimenting. …
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ATX power supply max current 12V P8 connector

According to the EPS12V standard section 6.1.2 Processor Power Connector, the requirement is that the connector uses two different power rails (12 V1 for pins 5 and 6 and 12 V2 for pins 7 and 8) if th …
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Use PSU as replace for broken source +12Vdc 3.33A?

It should be possible and not too complicated. There are many guides explaining the process. Here's one. UPDATE: To complement the other answer: Some computer PSUs may already have needed load instal …
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