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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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  #11  
Old 01-14-2012
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Probably.
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Old 06-30-2018
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What is "an old linear power supply?"

This article seems to describe double forward PSU's. Are these being eclipsed today?

How do metal oxide varistors "control potentially damage-causing power surges?"

The OP says, "Located immediately after the transient filter (if present), the input rectifier is responsible for converting AC to DC power. Self-contained bridge rectifiers are most commonly used, sometimes in pairs in higher watt designs, but some cheaper units get by with four diodes in a bridge arrangement as well." Does this relate to full bridge, half bridge and bridgeless designs? and what do those terms mean?

Pardon my ignorance about these things.
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  #13  
Old 06-30-2018
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Quote:
Originally Posted by ehume View Post
What is "an old linear power supply?"
Something that doesn't have primary switchers.
Thus Operate at mains Frequency.

These days they usually use a toroid transformer. And is still in use in some electronics gear. IIRC it was Spectrum analyzers or stuff like this.


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Originally Posted by ehume View Post
How do metal oxide varistors "control potentially damage-causing power surges?"
Its not much more than a voltage dependent Resistor.
The higher the voltage, the lower the resistance. Wich means with a short....
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Old 06-30-2018
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Quote:
Originally Posted by Stefan Payne View Post
Its not much more than a voltage dependent Resistor.
The higher the voltage, the lower the resistance. Wich means with a short....

One might like to mention that it is not obvious when they are worn out.
  #15  
Old 07-04-2018
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Sorry about all of the broken images, everyone.

Jeremy had to close his Photobucket account.

We'll try to get new photos up.
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