Re: [CAD_CAM_EDM_DRO] P.S question

In a message dated 17-Jun-02 19:38:11 Central Daylight Time,
afogassa@... writes:

> In other words, will the Voltage be steady at 36v. till I get to
> the maximum courrent of 6 amps? then it starts to go down to 24V?

No, Foggy. The "36 volts" is "open-circuit" (="no load at all") assuming the
capacitor is not leaky, etc. That voltage will begin to drop the INSTANT you
draw a microamp, but it will not really be noticeable until you might draw,
say, 200 mA (that's 1/5 amp in otherspeak). It shouldn't get down to 24 VDC
until you draw nearly the RMS rating in amperes of the transformer. That is,
if the transformer is 24 VAC, 100 amp, you would have about 36 VDC if you
loaded it 20 amps or so! But if it is a 6 amp transformer, then if you DID
draw 6 amps of DC, the voltage woujld probably drop to about 24 V. BUT! It
would contain more ripple in that case!

Sorry if all this is confusing. Books on the topic are written by folks of
much more eloquence than I, and I suggest you read-UP on "DC Power Supply
Design Techniques". Radio Shack probably has something close to that for
sale. Or a nearby library? Jan Rowland


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