Magnetic levition with TL494

Dear All
I have follow this site https://www.facebook.com/MagLevitator/ for to make a magnet levitation, But not work (no volt out for
driver gate of mosfet ) So please help me check schema is right and if not good please correct it for work. Many thank you
Best regard
lam

It appears that the hall sensor sends a signal to the IC. A hall sensor responds to a magnetic field. No doubt it's crucial where you install the sensor, and how you orient it, and how close it is to a magnetic field.

Question:
What condition makes your IC turn on the mosfet? Is it (a) when the hall sensor is near a magnetic field? Or (b) when a magnetic field is absent?

You must not leave the inputs of the unused error amplifier (pin 15/16) unconnected. Bias it according to datasheet, e.g. + input to GND, -input to Vref.

If you want to achieve continuous pwm rather than on/off current control, the error amplifier should be supplemented with a gain setting feedback network.

BradtheRad said:

It appears that the hall sensor sends a signal to the IC. A hall sensor responds to a magnetic field. No doubt it's crucial where you install the sensor, and how you orient it, and how close it is to a magnetic field.

Question:
What condition makes your IC turn on the mosfet? Is it (a) when the hall sensor is near a magnetic field? Or (b) when a magnetic field is absent?

Click to expand...

BradtheRad said:

It appears that the hall sensor sends a signal to the IC. A hall sensor responds to a magnetic field. No doubt it's crucial where you install the sensor, and how you orient it, and how close it is to a magnetic field.

Question:
What condition makes your IC turn on the mosfet? Is it (a) when the hall sensor is near a magnetic field? Or (b) when a magnetic field is absent?

Click to expand...

Thank you for taking the time to my question
My problem has been resolved. Thank you again so much for your enthusiasm to help me

FvM said:

You must not leave the inputs of the unused error amplifier (pin 15/16) unconnected. Bias it according to datasheet, e.g. + input to GND, -input to Vref.

If you want to achieve continuous pwm rather than on/off current control, the error amplifier should be supplemented with a gain setting feedback network.

Click to expand...

Dear FvM
My problem has been resolved with your concern and help,Thanks again for your time help me