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VARIABLE PWM SPEED CONTROL

There are several methods for controlling the speed of DC motors. One simple method is to add series resistance using a rheostat. As considerable power is consumed in the rheostat, this method is not economical. Another method is to use a series switch that can be closed/opened rapidly. This type of control is termed as chopper control. We’ve described here a PWM-based chopper circuit that smoothly controls the speed of general-purpose DC motors. Fig.1: Block diagram of PWM-based speed controller Fig. 1 shows the block diagram of a basic PWM-based chopper. The circuit shown in Fig. 2 is designed as per this diagram. A dual timer IC (NE556) is used to configure both the astable as well as the monostable multivibrator. Timing components for the astable are chosen to provide a frequency of 546 Hz, while the monostable components are selected to obtain a maximum pulsewidth of 2.42 ms. Diode D1 improves duty factor of the astable oscillator output, whereas D2 acts as a free-wheeling diode. ...

DC Motor Speed Control using PWM The so-called PWM or Witdh modulation is a technique often used to control a load, for example, is the control of DC motor speed PWM techniques are used frequently. Usually to make a simple PWM (for practice or the introduction PWM) fans to use some of the facts of the op-amp circuit, which consists of Schmitt Trigger circuit, the integrator and comparator. Schmitt Trigger function that produces a square wave will become the sawtooth wave or integrator is also called common rail and the ramp compared to a reference voltage that can change a lot of stress. So the result is a PWM output. These two schemes are variations of different circuit PWM. The diagrams are for 12V operation and there are upper (ground) and low side (+12 V common) versions. The version of the lower circuit uses an N-channel FET, the high-side version of the circuit uses a P-channel FET. N channel devices tend to handle more current P-channel devices, which are also less expen...

This is a simple Inverter 5000 Watt PWM Circuit Diagram . This inverter uses PWM (Pulse Width Modulator) with type IC SG3524. IC serves as a oscillator 50Hz, as a regulator of the desired output voltage. Input power ranging from 250W up to 5000W output and has. Following a series INVERTER 5000W with PWM (Pulse Width Modulator).   Inverter 5000 Watt PWM Circuit Diagram Pcb Layout Below is the output power settings that can be issued by this inverter: DC voltage and Transformer "T2" winding recommendation: Winding Power Supply 12VDC 750W P: 24V "12-0-12" / S: 220V 1500W 24VDC P: 48V "24-0-24" / S: 220V 2250w 36VDC P: 72V "36-0-36" / S: 220V 3000w 48VDC P: 96V "48-0-48" / S: 220V 3750w 60VDC P: 120V "60-0-60" / S: 220V 4500w 72VDC P: 144V "72-0-72" / S: 220V 5250w 84VDC P: 168V "84-0-84" / S: 220V Transformer used is the transformer CT R1 serves to regulate the voltage to 220v inverter R2 serves to regulate ...

What is modulation? In analog or digital communication system, it is impossible to transmit a low frequency message signal over a channel, it causes signal distortion, attenuation or signal loss. Inorder to make the transmission ideal (almost), we have to use some techniques called modulation. Modulation can be defined as the process of varying some characteristics of carrier signal in accordance with the instantaneous value of message signal. Carrier signal is a high  frequency wave generated by a local oscillator, used to carry the message signal from transmitter to reciever. The message signal which is mixed with carrier wave is called modulated signal and the process is called Modulation. The modulation is an important process in a basic communication system, which increases the transmission range, reduces the size of antenna and increases the efficiency of the system by reducing noise interference. Read More.....

The concept for this small birthday present was to create a small heart shape with red LEDs and then to draw a heart shape underneath it on the PCB as a backdrop. Then a small processor was added to control the heart shape of LEDs for both fade and pattern control. The method of control that we use (PWM) allows us to save precious battery life, control the exact brightness of each specific LED and create this tiny but awesome project.