Re: [CAD_CAM_EDM_DRO] Simple PSU stuff

The fan can act as the bleeder if it is a DC fan.

If you are going to run the fan off the DC supply, you will need to add a
series dropping resistor. With 24 Volts ac into a bridge rectifier, you will
get about 33 volts DC output which will burn up the fan.

Bob Campbell

----- Original Message -----
From: <abbylynx@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 12, 2002 8:10 AM
Subject: [CAD_CAM_EDM_DRO] Simple PSU stuff


> Hello again Folks,
>
> I have a nice heavy toroidal transformer here, rated 160VA, with two
> windings of 12V @ 6.3A each, a 20A full-wave bridge rectifier (100V
> or 200V I think), and a big 50V 47,000uF capacitor. I'm going to hook
> the windings in series, to get 24V. I want to build a power-supply,
> but am wondering if I need to use bleeders on this? I'll also be
> chucking a 24V fan onto the whole rig, so that should do the job of
> bleeders right?
>
> As for the load, it'll be 3 bipolar drive 2A, 3.2V stepper motors,
> ala the type Sherline provide. Should be enough juice, no?
>
> The next question, what rating and type of fuse would be recommended?
> Should I put fuses on all the motors grounds, or would one single
> one be sufficient?
>
> I know this is a repeat so some earlier posts, but I have been
> looking for three days on/off and not been able to find the original
> message I was looking at. If I can get some good answers here, I'll
> make a nice li'l image and some info and splab it up on the file
> section for all to see. :)
>
> Thanks
>
>
>
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