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Can You Power 12V fans directly from a 24V power supply?
1.- Put a resistor in series with the fan, the resistor having the same dynamic impedance than the fan while it is running, and enough power dissipation. You probably may use an incandescent filament lamp instead of the resistor. 2.- Connect two identical 12V motors in series with the 24V power supply. 3.-
What kind of power does a computer fan need?
Quiet, low power and surprizingly efficient, computer fans are an ideal cooling option for smaller cabinet grows. The only problem is that most computer fans are 12v and not 120v! How do I run a 12v fan on normal household power? (A 145 watt computer power supply is over-kill for a 5-20w fan.
How many 12 volts does a power supply need?
That is analogous to amperage. So the power supply needs to stay as 12 volts only it has to provide three times as much current to run all three fans and computer power supplies typically have plenty of amperage to run especially fans. Not the answer you’re looking for?
How many 12V fans can I run in parallel?
It is much simpler, and safer, to run the motors in parallel using a 12V supply that can deliver three times one fan’s start-up current requirement. If you fans are of the same type, you might be lucky.
Can a fan have the same voltage as a resistor?
Many of the answers I read below are assuming two fans in series in the system. Any two devices/fans/resistors etc whatever their voltage rating, if connected in series will ALWAYS conduct the same current… they may not have exactly the same voltages, but the current in each component will be EXACTLY the same.
Can a DC fan draw the same current?
Any two devices/fans/resistors etc whatever their voltage rating, if connected in series will ALWAYS conduct the same current… they may not have exactly the same voltages, but the current in each component will be EXACTLY the same. In a series DC circuit you cannot have one drawing more current than the others.
What happens when a fan is turned on?
When the fan turns a back emf is generated across the wires, which acts against the input voltage. The input 24 Volts is divided between the back emf across the windings which develops torque and the wire resistance, which will develop power loss = I^2*R which causes the windings to heat up.
Can a 3 wire cooling fan be used?
Prototype was tested with a 80mm/12VDC/3-Wire cooling fan, using a 5VDC lab power supply. Even at 5VDC, the fan performance is good, and the operation is very silent because of the low rpm rate. Besides, total power consumption is comparatively low! You can use almost all standard 3-wire cooling fans with this adapter circuit.
How does a 3 wire cooling fan monitor circuit work?
If the monitoring circuit sees no pulses (fan off) or weak pulses (very low rpm), then it raises an alarm to inform the operator/user about the mishap! Prototype was tested with a 80mm/12VDC/3-Wire cooling fan, using a 5VDC lab power supply. Even at 5VDC, the fan performance is good, and the operation is very silent because of the low rpm rate.
Where does the Red cable go on a 3 wire fan?
The red cable goes to the positive of the power supply (Vcc) and the black to the negative (Gnd). However two fans with 3-wire connectors may not have the same wire colors.