Re: Power supply

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Lester Caine <lester@...>
wrote:

>
> Mina Aboul Saad wrote:
>
> > Hi,
> >
> > I'm trying to rebuild the power supply that came with an old

lathe, the Transformer is good I took 65 AC from the output fed it
to a bridge to get the DC and then on to a Capacitor.

> > The thing is the DC voltage after the bridge is stable at 65 VDC

but after the Capacitor it grows up to 90 VDC which is too high for
my Geckos 320.

> >
> > Any advise?
>
> Not really a lot you can do. The 65V AC is too big really.
> One option is to add a linear regulator to take the 90V DC down a
> maximum of 80V, but that needs some good components for the

regulator.

>
> --
> Lester Caine - G8HFL
> -----------------------------
> L.S.Caine Electronic Services - http://home.lsces.co.uk
> Model Engineers Digital Workshop -
> http://home.lsces.co.uk/ModelEngineersDigitalWorkshop/
> Treasurer - Firebird Foundation Inc. -

http://www.firebirdsql.org/index.php

>You will need a bleeder resistor across the filter cap. on any

supply you build this may lower the voltage to acceptable value,
depends on the transformer and cap but would be worth a try, meby 1k
ohm