Re: bleeder resistors

Hi Tony, Scot,

One might also consider getting one or two 24V fans (or 12V, whatever),
and connecting them in series with a dropping resistor across the
supply. Many of these fans take around 250 mA, just calculate the value
of the series resistor.

Alan KM6VV
P.S. Fans in series should have the same current rating.


Tony Jeffree wrote:

>
> <SNIP>
> A more reasonable choice might be to go for, say, discharge time of 100 seconds,
> needing a time constant of 20 seconds, therefore a resistance value 2K
> Ohms. This is still going to draw 40 milliamps at your 80V supply rail, so
> will be dissipating about 3.2 Watts - still needing a 5 Watt rated resistor
> - but not too bad.
>
> Hope that helps -
>
> Regards,
> Tony
>
> At 16:15 12/02/2002 +0000, you wrote:
> >So I'm setting up my control box, Surplus geckos and a big ol transformer.
> >My buddie and I have done all of the calculations to the best of our
> >knowlege. One thing eludes me. I have a paralell array of three 3300uf
> >capacitors and I was wondering if any of great electrical knowlege would
> >happen to know what rating of bleed resistor I would need to set at the end
> >of the array.