Hello,
First post after many many hours of GOOOOOOOOGLE and searching here.
Situation:
I would like to use the output from an existing PWM fan port which is relatively low current to drive a higher current load (see pdf attached BTT SKR MINI E3 V2.0-PIN.pdf FAN 0 and FAN 1 - PC6 and PC7).
The control options from the current PWM are quite good but the DC current handling is relatively low.
I purchased a small dual NPN mossfet array from amazon thinking it could simply relay the output from the existing PWM signal.
However when I installed the device, the larger load is simply activated fully regardless of PWM state and seemingly regardless of which original fan pin I attach the trig/pwm input on the FET.
There's also an LED onboard the PWM fan source which lights up indicating to me that there's somehow back current.
I don't know how to proceed.
I was thinking maybe I need some transistors inline on the signal because it seems to drive the led which means perhaps there's a ground path which effectively "turns on" the FET.
Any interested in helping a noob out?
TANKS!
Here's the FET: https://www.amazon.com/ARCELI-Trigg...coding=UTF8&psc=1&refRID=2GDK740BXCHNEPRHZ4ET
And here's the board : https://www.amazon.com/BIGTREETECH-...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
First post after many many hours of GOOOOOOOOGLE and searching here.
Situation:
I would like to use the output from an existing PWM fan port which is relatively low current to drive a higher current load (see pdf attached BTT SKR MINI E3 V2.0-PIN.pdf FAN 0 and FAN 1 - PC6 and PC7).
The control options from the current PWM are quite good but the DC current handling is relatively low.
I purchased a small dual NPN mossfet array from amazon thinking it could simply relay the output from the existing PWM signal.
However when I installed the device, the larger load is simply activated fully regardless of PWM state and seemingly regardless of which original fan pin I attach the trig/pwm input on the FET.
There's also an LED onboard the PWM fan source which lights up indicating to me that there's somehow back current.
I don't know how to proceed.
I was thinking maybe I need some transistors inline on the signal because it seems to drive the led which means perhaps there's a ground path which effectively "turns on" the FET.
Any interested in helping a noob out?
TANKS!
Here's the FET: https://www.amazon.com/ARCELI-Trigg...coding=UTF8&psc=1&refRID=2GDK740BXCHNEPRHZ4ET
And here's the board : https://www.amazon.com/BIGTREETECH-...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
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