Pc Power Supply Circuit | Electronic Project Circuits

Posts Tagged ‘pc power supply circuit’

Repair Dell GX620 computer with myself

I had been using Dell GX620 Computer for a long time because it has good and durability. I lost it some days ago. My friend who is a computer repairer said the power supply is having problem. He told me to buy it at amazon.com,they are very nice it has low cost and free to deliver too. Read more

Be the first to comment - What do you think? Posted by admin - April 27, 2011 at 9:08 am

Categories: Power supply Tags: pc power supply circuit, Repair computer

200W PC power supply switching 110V-220V

view picture other switching power supply Circuits

This be PC power supply for Computer again interesting circuit. May advantage with friends at do an occupation can repair a computer? By think be the character Switching power supply 200W sizes take AC Voltge Source 2 level be 110V and 220V choose can use leisurely. And still use volt out many the group be +5V ,+12V, -12V enough will use for small-sized computer or AT power supply. When see the circuit will think use the integrated circuit IC TL494 power supply circuit be pillar equipment. Make the circuit sees not difficult or repair easy there. The detail is other , please see in the circuit better.

Be the first to comment - What do you think? Posted by admin - August 10, 2008 at 10:14 am

Categories: Circuit com, Power supply, Switching power supply Tags: pc power supply circuit, power supply computer, TL494

PC Power 12 V Current Limiter

PC Power 12 V Current LimiterTo safely power something from your PC, the attached loads have to be limited to a safe current in order to avoid the chance that a short circuit might cause inadvertent shutdown and damage to your data. This circuit can be used to safely bring out the 12V line from your computer to supply a limited amount of current to power external gadgets.

With normal loads, the power transistor is in saturation and so the regulated +12V line is directly available (minus only the Vcesat of the PNP transistor). If the output is accidentally shorted, the npn transistor turns off and removes the base drive of this transistor.

This circuit is intended for protection from short circuits. It might be possible to apply a load that brings the series transistor out of saturation without removing base drive to it: such a situation will cause heating and might cause it to fail short-circuit. Those who wish to draw significant current from this circuit will be well advised to check that the transistor is indeed in saturation with their intended load.

That said, this is a simple way to draw a few tens of milliamps at 12 V from your PC without danger to either load or the PC.

Link Source http://www.instructables.com