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I thank you in advance for your time, knowledge and any advice you can give me, as drivers are quite expensive and I hate de-soldering components :)

Have a nice day!

ADDED:

Thank you again for your time

ADDED:

[It seems like the blowup is located at pin number 6, which is Vs. Too much current going in the driver from the motor  ?]

• Using a driver with a second MOSFET will give a lower voltage drop on the "off" part of the PWM cycle because instead of going through the body diode (in red), the back-emf current will go through a fully conducting MOSFET (which has a lower voltage drop)  ? Have I understood right  ?

• What are the advantages to using a driver (and a second MOSFET) apart from the lower voltage drop then  ? Maybe it is more useful for smaller motors where voltage drops matter a lot more  ?

• Shouldn't there be some kind of buffer between the 555 output and the MOSFET gate  ?

• Should the grounds of both the 12V Vcc battery and the main motor battery be connected  ?

• If I choose to use a driver, which one would you recommend and/or which datasheet characteristics should I pay the most attention to  ?

[It seems like the blowup is located at pin number 6, which is vs. too much current going in the driver from the motor?]

• Using a driver with a second MOSFET will give a lower voltage drop on the "off" part of the PWM cycle because instead of going through the body diode (in red), the back-emf current will go through a fully conducting MOSFET (which has a lower voltage drop)? Have I understood right?

• What are the advantages to using a driver (and a second MOSFET) apart from the lower voltage drop then? Maybe it is more useful for smaller motors where voltage drops matter a lot more?

• Shouldn't there be some kind of buffer between the 555 output and the MOSFET gate?

• Should the grounds of both the 12 V Vcc battery and the main motor battery be connected?

• If I choose to use a driver, which one would you recommend and/or which datasheet characteristics should I pay the most attention to?

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@EdinFifić Is this the circuit you suggest I should try ? :

There are a few things I don't quite get :

• Using a driver with a second MOSFET will give a lower voltage drop on the "off" part of the PWM cycle because instead of going through the body diode (in red), the back-emf current will go through a fully conducting MOSFET (which has a lower voltage drop) ? Have I understood right ?

• What are the advantages to using a driver (and a second MOSFET) apart from the lower voltage drop then ? Maybe it is more useful for smaller motors where voltage drops matter a lot more ?

• Shouldn't there be some kind of buffer between the 555 output and the MOSFET gate ?

• Should the grounds of both the 12V Vcc battery and the main motor battery be connected ?

• If I choose to use a driver, which one would you recommend and/or which datasheet characteristics should I pay the most attention to ?

Thank you again for your time