Re: [CAD_CAM_EDM_DRO] Re: Bleeder resistor for power supply size?

In a message dated 7/6/2003 8:29:43 PM Central Standard Time,
davemucha@... writes:

> Is there some pressing reason to drain the power ?
>

Dave and others on this thread: If the dozens who might "build something",
yet without a CLUE what electrons look like, are ALL very careful not to TOUCH
anything, then NO bleed, or let the LOAD perform that task is fine. HOWEVER,
if any of this same group of "dozens" ever do their own checkout, repair, s
howing-off, or "adding in something else not yet thunk of", they can get a
SURPRISE with even only 30 volts stored in a 15,000 µf and larger cap! It will RUIN
the tips of some nice tools, and leave "nasties" on otherwise brite, shiny
terminals or tops of transistors,etc.!

Another "bleed" that is NO big deal, AND, will "show" what's going on, is
simply a good brite LED with the approp. resistor (figure it to permit 15-20 mA
to flow through the LED when power's on). This can REMIND you not to go pokin'
your shiny new tools about between terminals, and how long it will be before
the "dangerous juice" is sufficiently dissipated! It further acts as your
"Main DC" pilot-lamp! GOTTA have one of those anyway!

Jan Rowland


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