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madoverlord

Fan drive -- how much current?

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I'm running two blade nano RC helicopter tail rotors on the fan circuit. This is what I found out in doing it. The fan circuit has an NPN (low side) darlington transistor BD679 as a pwm circuit. That transistor is rated for 4 Amps. However, I couldn't get even 1 Amp from it due to noise problems that I couldn't solve. I put a 1K resistor across the connection and then built my own power control circuit using just the signal. I used a MOSFET and took power from the Ultimaker to run it.

regards

 

Scott Vader

 

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I've made a fanduct for two 40mm fans. Both are 0,05A 12V. Only at 80% fanspeed they turn very slowly, on lower or higher fanspeed nothing.

The fans run perfectly at 12V form a power supply. The original ones draw 0,09A, the new ones 0,05A.

Has anyone got a clue?

 

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