Re: PSU Charge Dissipation
- From: "Watson A.Name - \"Watt Sun, the Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx>
- Date: Thu, 14 Jul 2005 05:12:10 -0700
"Gary D." <ignore@xxxxxxxxxxxx> wrote in message
news:89dcd19iskhu38hrb52nesl19bgoqulmcq@xxxxxxxxxx
> Excuse me if this is the wrong group.
>
> I have an old home computer PSU and I want to remove the electronics
> temporarily while I cut extra metal off the rear circular exhaust port
> as it interferes with exhaust air flow. Obviously I would prefer not
> to come to any harm!
>
> Can somebody please tell me how many day/weeks it would take for any
> stored electrical charge in a computer's power supply unit (PSU), i.e.
> in the capacitors, to dissipate enough for it to be okay to touch the
> circuit board and yet be safe from any potential electric shock?
The PSes I've seen have a bleeder resistor, usually about 330k, across
the HV capacitors to remove any charge when the power is removed. This
takes only a few tens of seconds. The PS can work with an open bleeder
resistor, so as a precaution you can measure across the caps with a DMM,
and you should get zero volts. Of course take all the necessary
precautions such as make sure the PS is unplugged, etc.
.
- References:
- PSU Charge Dissipation
- From: Gary D .
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