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.

Red, yellows, greens. leds are around the 2v range unless you have low
voltage variety then they can be 1.2v.
Blue leds are aroun the 5v range and white around there also.
The capacitor is going to leak down to 0v anyway over a period of time.
But this is not in the lethal range you can touch a 24v supply and not feel
anything.
Right around 60v dc is the lethal range but all the conditions have to be
right and it has to go across you heart to stop it. Just be careful with
high voltages.



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: High-Tech <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's 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's done the light will go off.
> Derek
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