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I mean Right. I'm using the ones you told me BC338. I was think the same, that the specs in the fan would affect the way it works with dutycycle. It's working nice, but i will try different fans to know why it happens.


Thank you

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Your calculations are Roth, I was using a different resistor 160 Ohm as R3 when I was doing I only notice now.

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Hi Hero999,

I change R3 for 67 Ohm and I have ib of 24mA and vbe = 1.6V and it works with a min duty cycle of 3.13%.
I will send the file to Mixos.

Thank you for that it will have a faster switching time and it's cheaper to make.

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"How did you measure Ib?"

I didn

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Hi Hero999,

It works but only with a duty cycle higher than 70%, ib = 12mA. Tomorrow I'm going to change the resistors, let you know.

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Hi Hero999,

" found the datasheet for the MCU you're using and noticed that the I/O pins probably won't be abe to supply enough current to ensure a transistor driving a 300mA load will saturate properly so I used two transistors rather than one. Tr2  will deliver between 17mA and 21mA to T1's base but the impedance seen by the MCU's I/O pin will be about 10k so hardly any current will flow out of it."

I try but doesn't work because I need a transistor to be able to drive +/-400mA Load. but this weekend I will do the calculations to see if the values are matching. Using a mosfet driver will increase the price it will be twice more expensive then the LM358. It is useful if you need a faster switching time.

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Thanks Hero999, I will try this weekend or next week and then I will let you know how it works.

I'm attaching the code some part of the code is comment because  I'm testing a few things. the code is in basic.






H

PWM.txt

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In my project PWM fan controller, I'm seeing people complain because my choose of components.

I use a LM358 because it's a general purpose Am-pop, probably it's a common component most off us have. The typ SR of LM358 it's 0.6 V/