Do not forget that the starting motor current is several times of no-load current. The choice of Q2 must correspond to the current of the motor as well. The transistor Q2 will pass the current directly. Using two transistors connected in a Darington pattern, it has a very high current gain. So we use a transistor to drive the current. Since the output of CMOS cannot drive the motor directly. The motor speed will be the highest.īut when the VR1 is high, the square signal width is low (Leaving more space). When the VR1 is adjusted to the lowest setting, it will cause the duty cycle to reach 100%. R2 determines the time for the output range to be 1.īoth R1 and VR1 will set the time of the output range to be 0.Īdjusting VR1 will change the duty cycle of pulse. It makes it possible to adjust the duty cycle unequally. And, both diodes D3 and D4 determine the direction of charge and discharge current of C2. The duty cycle is only 50% and is not customizable. If we use the only resistor like a basic circuit. Each will be set to the inverter gates and connected to the pulse oscillator. To 4011 CMOS: generate a square wave pulse.Also, you can use a bridge rectifier without a center tap transformer and 4 diodes.This circuit is a full-wave rectifier that center tap transformer and 2 diodes.And, there is a C1 filter to DC voltage that smooth so well.Then, AC voltage current flows through to D1-D4 to the full-wave rectifier into DC current.T1 converts a main 220V voltage down into 12V.The AC main comes to this circuit to a power supply section.While motor function, maybe a reverse current, it must put Diode D1-1N4148 to prevent this circuit.We should hold a heat sink at TIP41 due to its heat when they are applied.Next, we use two transistors are TIP41 and BC548 to connect in a Darlington makes drive current higher.We use a potentiometer-VR1 to adjust the speed as needed.Which it is determined to works in the PWM model (pulse width modulation) so has high It is highly effective, Low power consumption. Because it uses the 4011 NAND gate CMOS as the main part and a few other components. I introduce this circuit as the figure that shows below. If you want to control the speed of a small 12V DC motor. Because we use a CMOS IC that can be used with a voltage of 3V to 15V. The advantage of these 2 circuits is that if you have a 9V or 6V motor or battery, you can use it immediately. They can drive a motor 12V at 1A current. Of course, we are not able to find a normal switch that works fast at that level. When we need the maximum speed, we have to adjust the duty cycle to 100%.
#12V DC MOTOR SPEED CONTROLLER GENERATOR#
Related: 4011 Tone Generator circuit projectsīut we still have another interesting issue. Recommended: Simple IC-4011 LED flasher circuitsīasic oscillator using NOT gate from NAND or NOR gate. We used to use the Digital gate as an oscillator in LED blinking.Īnd, we use a not gate from connecting of 4011.Īlso, we can use the NOR gate to NOT gate. And, it can be adjusted to the duty cycle. Thus, we need an oscillating circuit to control the switch on-off the motor. Suppose that: Voltage level is 10V, t = 0.2mS, T=1mS, Period: More importantly! When the Duty Cycle of Period is greater, it will get the average voltage more too.Īre you understand? I hope you clearly understand even my English is poor.Frequency: the high-frequency pulse will receive the average voltage greater than a low-frequency pulse.The average voltage will vary depending on: And, the voltage average is low half of the power supply voltage. The idea of a good voltage change is the pulse. But when high voltage causes the speed of the motor is high. Normally, low voltage causes the motor speed is low. The voltage can control the speed of DC motor well.
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