Re: [CAD_CAM_EDM_DRO] electrical help wanted

Brian Fairey wrote:

> Designing a PS for Gecko drivers.
> The transformer gives out 50-0-50 what size capacitor should I use ?
>

If you use two diodes, and connect the center tap to capacitor minus, it
will produce ~71 V DC, so a 50 V capacitor is definitely out of the
question!
You could possibly use a 75 V cap, but that is too slim a margin. A 100
V cap is much more reasonable.

If you use a full bridge rectifier across the 50 V AC terminals, you'd
get 142 V DC, so definitely do NOT do it that way.

> ie 50v rating or 100v and the bigger the capacitance the better or what?
> I remember in the OLD days that one put a capacitor across the output
> then a resistor inline and another capacitor across the output. I
> suspect this was great for the ripple effect but perhaps the Gecko
> dont care.
>

That's for audio work, the Gecko drives don't mind a little ripple.

You don't say if this is for servo or stepper drives, which size Gecko
stepper drive, etc. so I can't give much info on capacitance value.

Jon