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Yet Another DC Box Fan
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18
comments (18 topical, 0 editorial)
Re: Yet Another DC Box Fan
(
3.00 / 0
) (
#8
)
by tecker on Wed Jul 9th, 2008 at 06:05:37 PM MST
(
User Info
)
First order is to stay below 4 volts ( max treshold ) .At 3k you should be able to hear the circuit with an AM radio . There won't be a whole lot of adjustment at around 25 percent the make space duty cycle will be rapped up by the frequency and be just like having a resistor in there . If it works for you then there's not a lot of reason to make changes . The impedance of the 50 volt motor is keeping the fet cool running aT 12 volts. I'm a little confused sounds like the 25 k pot is not your speed adjust.
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Parent
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Re: Yet Another DC Box Fan
(
3.00 / 0
) (
#13
)
by ghurd on Wed Jul 16th, 2008 at 10:37:35 AM MST
(
User Info
)
The real speed adjustment is the resistors.
The PWM circuit was sitting there, so we tried it. Fan on High (no resistors).
It didn't save as much power as we hoped.
Mentioned the PWM circuit and noise to someone a few weeks ago, so it was more an interesting side note.
G-
[
Parent
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Yet Another DC Box Fan
|
18
comments (18 topical, 0 editorial)
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