Mr HG
New Member
Hello ,
I designed a power amplifier so that it plays the role of interface between my STM32 microcontroller and a pump (12V 1A).
My problem here is this: As soon as I put my circuit power (+12 V GND-12V), the motor is running before I give him the PWM signal from my microcontroller. Then when I inject the PWM signal the peed of rotation increases.
Why the motor running before I put the PWM input?
Please give me a change in the circuit, so that the engine runs only when I give him the PWM signal ...
Can you help me ??
Here attached the circuit of the power amplifier.
I designed a power amplifier so that it plays the role of interface between my STM32 microcontroller and a pump (12V 1A).
My problem here is this: As soon as I put my circuit power (+12 V GND-12V), the motor is running before I give him the PWM signal from my microcontroller. Then when I inject the PWM signal the peed of rotation increases.
Why the motor running before I put the PWM input?
Please give me a change in the circuit, so that the engine runs only when I give him the PWM signal ...
Can you help me ??
Here attached the circuit of the power amplifier.