If the voltage on the DC motor change will this have an effect on the speed of the motor? For instance if the ambient temperature is 25 degC and I amplify the signal from the temperature sensor to 2,5 V the motor will turn, but if the signal from the sensor is amplfied to 12 V the speed will be greater than when it was 2,5 V?
The normal H-bridge configuration use two pnp transistors and two npn transistors, can I rather use four npn transistors to change the direction of the motor?
I want to use a LM 358 transistor to amplify the signal from the sensor and connect the LDR on the supply of the op amp.