Re: [CAD_CAM_EDM_DRO] power supply

Hi Peter,

What's your line (mains) voltage? Might just be high. And what primary
taps are you using? Most larger transformers of this type have
something like 115V and 120V taps. You might need to change the tap!

The transformer ratios are quite accurate, YIVMV (Your input voltage
might vary). ;>)

Alan KM6VV
P.S. A big screwdriver works to discharge a cap! POW! Not that I would
do that. ;>)

cadcamcenter@... wrote:

>
> How dependable are transformer specs?
>
> A Single phase 0-115-230V primary 24VAC secondary connected to a
> bridge rectifier and 15,000uF capacitor should produce 33 VDC. The
> actual output was 46VDC. The culprit? On checking the transformer
> secondary, the output was 33VAC instead of the specified 24VAC. Is
> this common experience?
>
> Based on what had been so emphatically put across recently, one
> should have no hesitation on using this power supply despite it being
> out of specs - voltage being so unimportant for steppers, right?
>
> Just to be on the safe side - what size zener diode should one place
> across the output?
>
> Peter
>
> BTW one should take care to discharge the capacitor, say, across an
> incandescent lamp at end of test.