This is my connection, i have tried connecting in parallel, but when i turn them on, both motor had serious drop in voltage, which causes both not to function properly. Your help is greatly appreciated! feel free to ask for more if you want to know more! Thank youu.
Please post a schematic that makes electrical sense, with pins and connections clearly labeled. The one you posted does not make sense.
Keep in mind that the Arduino 5V output cannot be used for motors.
Here is a great tutorial on schematics: How to Read a Schematic - SparkFun Learn
Much better, although the diagram is not complete. For example, no power or ground connections are shown for the Arduino, and no description is given for the motors. It lacks the required inductive kick diode across the motor connected to the MOSFET transistor.
The ancient L298 can supply at most 1 Ampere and will work only with small, low current toy motors.
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Is it safe if i remove the motor driver, connect second motor straight from Vcc and add the flyback diode on the first motor?
Not enough information to guess.
The FQP8P10 is not a logic level mosfet, so shouldn't be used with an Arduino.
It will sort-off work with low drain currents (small motors).
The L298 seems to be a bare chip (the pin numbering).
A chip needs several supporting parts to turn it into a motor driver, like kickback diodes.
Have a look at how many parts there are on an L298 breakout board.
Leo..
i see, thanks!
FQPF13N06L Rev.C1.20131104.fm (onsemi.com)
is this a standard one or Logic level mosfet?
The "L" in the number is a giveaway.
The fact that the Rds(on) is listed for 5volt, and there is a 3volt and 5volt entry in graph#1 on page3 confirms that.
Leo..
Understood, thank you so much, will replace with it
Which motors. The 8P10 might work ok for a small toy motor.
Use the first diagram on this site.
Leo..
I have
removed the motor driver and replace with a FQPF13N06L (MOSFET2)
replace FQP8P10 with another FQPF13N06L (MOSFET1)
adding flyback diode for both the FQPF13N06L (MOSFET1 & 2)
lower down the R1 to 200 ohm
and add one 200ohm Resistor for MOSFET2
and now it works out fine,
is there any hazard?
thank you
Thank you all for helping.
Thread summary (for future people with similar problem):
Issue: Using this circuit, the 12V power supply is not sufficient for both motors, causing motor to not work as required.
Solution at the end:
I added another battery parallel to the initial battery, somehow it works, not sure the reason 
due to low knowledge about electronics. Suspecting is the increase of current when I added another battery.
Key take away:
- You should post a proper schematic diagram instead of hand drawing circuit for clearer view of circuit.
- L298 can only supply most at 1A, is only suitable for low current toy.
- FQP8P10 is not a logic level MOSFET.
- FQPF13N06L is a logic level MOSFET, the L in the name shows that.
- A proper MOSFET connection should be as this:
- Too high resistance for R1(refer to schematic diagram) causes the problem also.
Any changes pls correct below, thank you all
Best Regards,
Willi
L298D has diodes built in...
Still 100 nF caps should be added for both 5V and 12V power supply.
There is an L293D (D for diodes), but I didn't know an L298D existed.
All L298(N) breakout boards have external diodes.
Leo..
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