In this article, we will discuss how to build LM386 audio amplifier circuit. It is a low-cost amplifier and also can power any speaker. For the size and the cost of the circuit, the sound from the IC LM386 audio amplifier can be effectively loud. There are several audio amplifier circuits designed using LM386 IC. The main drawback with these circuits is interference and noise. The noise from this circuit is much less and if designed on a right circuit board, this will create a great Audio Amplifier. The LM386 integrated circuit based audio amplifier circuit is a low power circuit that can supply a maximum power, i.e, 1 Watt (1W) and can be used in an extensive range of applications such as laptop speakers, portable speakers, etc.
Nowadays, the lack of water purifying is a major problem in rural areas. Because around 800 plus million people suffering every day due to insufficient quantities of water clean and also filtered water. Most of the present technologies available in the market are combating this problem due to high cost and power consuming. The solutions that do not use an extra of power generally need expensive and maintenance of the time-consuming filter. There are several chemical processing mechanisms for purifying the water but, if we use improperly it is hazardous. To overcome this problem with the idea of low cost in mind here is a system, namely “solar energy-based water purification system” that will take an advantage of natural energy in order to power a water purification system.
The Bluetooth technology is wireless technology and the main purpose of Bluetooth is used for the exchanging of data in between the two electronic devices. There is a short distance between the two electronic devices and it is built by using the personal area network. This technology is developed by the Bluetooth special interest group and its physical range is from 10m to 100m. The Bluetooth device can connect up to seven devices and it is used in the industry like smartphones, personal computers, and gaming consoles, etc. The IEEE standardized Bluetooth as IEEE 802.15.1, but the standards are maintained for short periods.
The microprocessor is the main important or the heart of the normal computer. Generally, we will use the microprocessors like Pentium, AMD, power PC, or any other brands and types of microprocessors. The microprocessor is also called as a central processing unit. The microprocessor is totally computation engine and it is fabricated on the single chip. The Intel has released the first microprocessor in the year 1971 and it contains the 4-bit microprocessor and having 2300 transistors, 640 bytes of memory addressing modes and with a clock speed of 108 kHz.
To control the speed of a motor, there are different ways. But in this tutorial, we are explaining simple and easy way by using the pulse width modulation (PWM). The modulation is a process of varying the parameter of a carrier signal in accordance with the instantaneous value of the message signal. The modulation process is used to reduce the size of the antenna and increases its efficiency. PWM is a technique used to generate the analog signals from the digital devices like MCU. All the modern MCU’s have dedicated hardware for PWM signal generator.