Re: [CAD_CAM_EDM_DRO] low voltage contorl circuit

On Mon, 26 May 2003 18:08:48 -0000, you wrote:

>Hi,
>
>has anyone made the low voltage regulator from the mosfet/transistor
>design in the files section ?
>
>/CIRCUITS/HIGHINPUTVOLTAGEREGULATOR.pdf
>
>I need to get 5 VDC from the secondary of a 48V transformer, may need
>to use the center tap to get 24VAC for this.
>
>just wanted to know how noisy this DC voltage will be.
>
>or, if anyone has a circuit to drop higher voltage to 5VDC without
>adding huge heat sinks to the voltage regulator.

One idea would be to go get either a small regulated 5 volt supply and
use it independently, or get a cheap 9 volt dc supply and run it
through a 5 volt 7805 regulator.

In a CNC setup, this would give you good isolation between the
voltages and keep the switching noise from the chopper drives down. I
plan to do much the same with an isolated board driver (CNC setup)
being driven from a printer port. I will have a separate power supply
for some of the logic circuits, which will be completely isolated.

Harvey

>
>Dave
>
>