Re: bleeder resistors

Alan Marconett KM6VV <KM6VV@a...> wrote:

> 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.

I have a 24V fan (no data on I or W) but measured 0.1A when connected
to 24VDC which makes its "resistance" 240? I have a 33VDC power
supply so

33V = (R + 240)0.1 and R = 90 ohm?
watt = 0.1x90 = 9 watt?
(values from hopefully not too faulty memory)

With an arrangement like that, the voltage falls off to a reasonably
low value after less than 1 minute, but am I asking/expecting too
much for the voltage to fall off to ZERO after a reasonable time so
that I can fiddle with the box without fear of discharge in the wrong
place? I can still measure volts after hours and mV the next day?

I used a 3-legged 24V transistor voltage regulator earlier and
thought that changing to resistor in series should discharge the
capacitor much more efficiently, but it seem there is no difference.

Peter