Fan Speed Control
Im looking for a fan speed control. Please dont post your internet search results here. Anyone, including me, can do a search and find mindless stuff. I am looking for specific knowledge, thanks ...
Forum Discussion
0.5 volts to keep it running, barely, and that low you can see the fan blade bouncing between the magnets.
0.8 to move it from a stop.
4 volts is super quiet, no blade noise, and 6 volts is still lower than low speed, but seems fast enough to move enough air to keep heat from building up. At 6 you start to hear the air, there is always some fan bearing noise.
4 volts would be a good sleeping speed since it is very quiet, a huge bonus.
The other one would not run so slow, it would stop before the fan got this slow.
So, this buys me a much bigger safety margin if I leave it on low and the batts get drained down super low. If batt is going to be 0.5 volts at the controller then I have much bigger issues than a $13 pot.
I do not have an amp meter to measure so low, mine measures up to 50 amps, so would not be good for small numbers, it is a needle.
Also, side question.. what is difference in having the switch or controller on the neg side vs the positive side (other than ability to turn off the wire current)?
Is this controller switching the neg side? Maybe just so if it does burn out that the full 12v can still flow through? I know an on/off switch means nothing to the fan, but the control on neg or pos side, is that different?
0.8 to move it from a stop.
4 volts is super quiet, no blade noise, and 6 volts is still lower than low speed, but seems fast enough to move enough air to keep heat from building up. At 6 you start to hear the air, there is always some fan bearing noise.
4 volts would be a good sleeping speed since it is very quiet, a huge bonus.
The other one would not run so slow, it would stop before the fan got this slow.
So, this buys me a much bigger safety margin if I leave it on low and the batts get drained down super low. If batt is going to be 0.5 volts at the controller then I have much bigger issues than a $13 pot.
I do not have an amp meter to measure so low, mine measures up to 50 amps, so would not be good for small numbers, it is a needle.
Also, side question.. what is difference in having the switch or controller on the neg side vs the positive side (other than ability to turn off the wire current)?
Is this controller switching the neg side? Maybe just so if it does burn out that the full 12v can still flow through? I know an on/off switch means nothing to the fan, but the control on neg or pos side, is that different?
