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Try just to test without the converter, 3. I seem to have missed your reply at first since I did not subscribe to your posts fast enough apparently: You need that to calculate the current you’re actually delivering to the motor. Just for fun I quickly simulated the circuit you posted earlier but with some minor modifications. Eventually, I want to be able to microstep the motors by balancing the pwm signal after I get it to full step with software running on the prop. I am not sure what voltage you need but you may try this one a 30n

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This is not the only way to do that, but is the most common. It cant be any simpler.

Using MOSFETS with TTL levels (5 Volt and 3.3 Volt)

My shunt resistor is the smallest 5W I had – 1 ohm. It is not a true logic level mosfet, it needs some 10 volts. R1 is just there to limit the current through the gat, coming from a microcontroller pin.

If an opamp sees a high signal from the pot just a voltage divider from Does the circuit can run these motors? When I apply the 12V directly to the coil, it pulls about 1. Do you have any idea why is the mosfet not working properly and letting the 12v works on the led strip? Phil are you using bipolar steppers? I think I understand. My motor has no specs, and I cannot find any specs, BUT I have about more of them, plus or so more of other small and larger types anyone interested in buying some?


After that it works good. I’m assuming 12V is probably the upper bound of how much continuous voltage current can be applied across a coil for this motor. But where can I mitor K in the datasheet?

Your understanding of the base-emitter voltage and transistor biasing seems correct – however you also need to keep in-mind that roughly, the current you need to supply to the base through the current limit resistor is roughly equal to the collector current divided by the transistor current gain which is specified on your transistor’s data sheet. The steppeer with this is that I wanted to use PWM and this would increase heating. So no R1 and T1 from your diagram link?

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That indeed is odd and I start to wonder if it is the IRL that steppfr shutting down or something else. Realise though that it is an inverting circuit. Email required Address never made public.

This way, I end up with a fairly square current wave through the windings. I had a look into using just N channel with a driver, but came to the conclusion that it’s not suitable for my application due to the switching losses. Like I said to Phillpill – I did a “quick” simulation. What you won’t want is for your attachment to the stepper to either slip which would make your CNC calculations end up wrong or have any significant play as that would add to any backlash error the nut was giving you.


Sepper for fun I quickly simulated the circuit you posted earlier but with some minor modifications. Software, schematic and PCB will be found in unipolar. This actually is used for heatedbed in 3D printers up to A.

Simple Unipolar Stepper Motor Full Step Controller

The two P-channel mosfet will be driven by transistors. It really needs a proper stepper motor driver that has current limiting and can drive it with a high voltage 24v, irff540 50v supply. Help identifying strange capacitor terminal style Started by Killians Yesterday at Wow, thank you Drone.

I think the downside to this, is that for that period of current fall, the torque will drastically be reduced, which may again limit the speed. More and more cheap Mosfets. The input pulses comes from your pulse generator.