RE: [CAD_CAM_EDM_DRO] bleeder resistor power supply

-----Original Message-----
From: Hugh Prescott [mailto:hugh@...]
Sent: Wednesday, October 17, 2001 8:28 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] bleeder resistor power supply


Greetings

However the cap discharge circuit you propose will not discharge the caps to
zero voltage.


It will discharge to some low voltage depending on the resistor and LED
cutoff current.

I would try it and check the remaining voltage across the caps, it may be
enough to damage semiconductors and or surprise you when you accidentally
short circuit the caps.

Was in St. Louis yesterday and visited the surplus electronics on Natural
Bridge road just west of I-170. They had a few power supply's in the range
of 5 to 48 volt and 10 to 40 amps. One other I saw was a 5 to 50 variable
that appeared to be in the 100 amp range no nameplate to give the
information but wire size, rectifier and cap size plus monster heat sinks
and fans indicated it could deliver some serious amps.

Hugh

----- Original Message -----
From: HighTech <hightechsystems@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, October 16, 2001 8:02 PM
Subject: [CAD_CAM_EDM_DRO] bleeder resistor power supply


> Here a neat trick you can try is put a led and a 3k resistor (50v,16ma)
> across the caps in your power supply. It will bleed the caps down and you
> will know when it done the light will go off.
> Derek
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