Showing posts with the label Electronics


Although there are certainly different types of speakers in terms of size, quality and price, essentially the components are pretty similar. These are the basics: The Enclosure: This is the part that you notice first. The enclosure, also known as “the Box” can be made of various materials including wood or plastic. This houses all the components of your speaker.  You decision on which one to buy will often be based on visual elements at this point. Crossover: This part involves circuits that direct the incoming audio signals toward the drivers. High frequencies are sent to the “tweeter” and low frequencies are sent to the “woofer”. Some speakers also contain a mid-range driver, which as the name suggests, plays the mid-range frequencies. Drivers: Have the function of creating sound waves. Also known as the “tweeter”, “woofer” & “mid-range”, every speaker uses a different configuration of drivers. Whether a woofer or a tweeter, all drivers comprise of an electromagnetic voice co

types of Diodes


Capacitor Power Supply circuit

One of the major problems that is to be solved in an electronic circuit design is the production of low voltage DC power supply from Mains to power the circuit. The conventional method is the use of a step-down transformer to reduce the 230 V AC to a desired level of low voltage AC. The most simple, space saving and low cost method is the use of a Voltage Dropping Capacitor in series with the phase line.  IC2 is connected as a differential amplifier and compares the signals at its two inputs. Referring to the  circuit  diagram : the input comprises a mains switch, fuse, transformer, bridge  rectifier  and smoothing capacitor (C2). The difference between the inputs is the voltage drop across 'current’ sensor R4. This IC feeds the current sensing input (pin 2) of the L200. P1 in the feedback loop of the 741 is used to vary the output current of the circuit. IC1 must be mounted on a suitable heat sink as it dissipates nearly all the power of the circuit. The reference level o

first windows 7 phone ads

Microsoft released the first ad of Windows Phone7. We can see in this video, a mess of black become larger and larger. I wonder what the hell it is, an UFO which appear in desert? Exciting! But when it comes to my face with some words: the revolution's coming, I realize it's a mobile phone, not too bad! just keep going to see which kind of revolution. The end...Hell, microsoft! All right, let's enjoy this "revolution"!


LAPTOP PROTECTOR CIRCUIT Protect your valuable laptop against theft using this miniature alarm generator. Fixed inside the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm through tilting of the laptop case. The circuit uses readily available components and can be assembled on a small piece of Vero board or a general- purpose PCB. It is powered by a 12V miniature battery used in remote control devices. IC TLO71 (IC1) is used as a voltage comparator with a potential divider comprising R2 and R3 providing half supply voltage at the non-inverting input (pin 3) of IC1. The inverting input receives a higher volt-age through a water-activated tilt switch only when the probes in the tilt switch make contact with water.When the tilt switch is kept in the horizontal position, the inverting input of IC1 gets a higher voltage than its noninverting input and the output remains low. IC CD4