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The essence of the circuit is for the input of tone and signal to provide an activation for the relay switch. Relay – an electrically operated switch where the current flowing through the coil of the relay is creating a magnetic field which attracts a lever and changes the switch contacts, thereby making its state open or close BC214 – a complementary silicon planar epitaxial transistor used in AF small signal drivers and am1 as well as for low noise preamplifier applications due to its feature of good linearity of DC current gain LM741 – a general purpose single operational amplifier with features such as offset null, compensated internal freq uency, voltage range with high input, good stability of temperature, and protected from short circuit The use of relay will allow the circuit to switch from one condition to another. It can also be referred to as a form of an electrical amplifier since it is able to control an output circuit of higher power than the input circuit. There are man...

    The Nexus 9 receives certification from the Federal Communications Commission (FCC) of the United States and a new photo of Nexus 9 reveals a rectangular square design. The season of Android and Nexus and all we know about them or rumored increases approaching. The Nexus 9 (Volantis) received certification from the Federal Communications Commission United States (FCC) just a few days ago, after HTC apply for this certification in June 2014. A purported image of Nexus 9 was released a few months ago now revealing that HTC and Google would be referring to this product as the HTC Volantis. A new photo of Nexus 9 was published by Upleaks. The photo shows the design of the Nexus 9 and seems to agree with the diagram and information posted on the FFC. This shows us that the design of the Nexus September would be more square than rectangular, in a way reminding some type of design that has the new BlackBerry Passport. Unfortunately, the picture shows only the back of the Nexus 9 ...

    The Nexus 6 would have a 5.9 inch screen with QHD resolution (2K), 13 megapixel camera with optical image stabilizer and a metal frame and the new version Android L. The Google phone, Nexus, will continue to grow after all Nexus 6 and come with a 5.9 inch screen, multiple rumors say. Although the photo is an image (render) created by Android Police, every detail which is present in this Nexus 6 has been based on rumors you've heard the blog and that have circulated on the Internet. According to AP, the official name of the new Google phone, manufactured by Motorola, Nexus 6 (Shamu) and would be called based on the new Moto X design, but in a larger size, black front speakers and a metal frame around cell. The back of the Nexus 6 include a 13 megapixel camera with optical image stabilization, dual flash, 3200mAh + battery, a front 2-megapixel camera and QHD (2K) screen. With these reports on the Nexus 6 hope this be a new cell showed both is size and its features and compon...

This is a small adjustable clock/date with thermometer function based on PIC16F628 or PIC16F84 microchip and DS18S20 or DS18B20 temperature sensor. The hardware part is very simple because it only uses a pic microcontroller, the DS18S20/DS18B20 sensor, 4x7 segments (common anode, something like KW4-301xxx Series, or common cathode something like CC56-21SURKWA), four transistors, some rezistors! When you first power the device the clock is mentained for 8 seconds. Then the date for 2 seconds and temperature will be displayed for 3 seconds. The clock has four buttons, with one button you enter in set mode, with another button you increase values, the third button will be used to decrease values and you can put or not, the reset. If you don't want a reset button just connect the pin to +5V. You can change: ho -> hour, from 0 to 23 nn -> minutes, from 0 to 59 (I could not display m so I used n twice for it) dd -> date day, from 1 to days/month -> calculated based on month...

Making your own universal remote control systems today is very easy. Such procure the relevant chips, assemble them and here goes, your hi-tech remote control device is working for you. Here we explain a couple RF 433kHz remote control chips especially designed for the purpose. The IC TWS-434 along with its encoder chip HOLTEK’s HT-12E form a high class transmitter circuit, whereas the chip RWS-434 through its complementing decoder IC HT-12D operates as the receiver module. Both of the above modules are able to exchange 4-bits of discrete data for control four external loads separately. With the easy availability of accurate remote control chips, making your own universal remote control modules is today just a matter of few hours. We discuss a couple of compact RF remote control transmitter and receiver modules here using the chips: HT-12E, HT-12D, TWS-434, RWS-434 Making a hi-end professional remote control system at home is a child’s play now. With the advent of micro remote cont...

Classification of Timers Timers may be classified in the following ways. 1.        According to the function performed by it. They are                (A)     Delay timers                (B)      Interval timers                (C)      Repeat cycle timer                (D)     Reset timer 2.        According to the technique used to achieve the industrial timing                               (A)  Ther rmal timers                (B)      Electromechanical timers                (C)      Electrochemical t...

This is the video amplifier circuit with splitter, it is designed to amplify the video signal, compensating for the loss of signal because this signal will then be split up to three outputs. The output signals may be used in television monitors, recording at the same time several DVDs, etc. .. The advantage of this circuit is that it is quite cheap, easy to build and the results are very good. Splitter and Amplifier Video Circuit Diagram The video amplifier circuit has a maximum gain ratio of only 4 times the impedance is 75 ohms on the input and output, and wide bandwidth of this circuit is 5 Mhz adjust VR1 1. Adjusting VR1 until the voltage at the base of Q1 is equal to one volt. And is the voltage drop across R7. (No input signal). Approximately 0.75 volts. 2. Adjust VR1 in the middle Enter the input signal is 1 Vp-p, then adjust VR2 to have the lowest rate of increase. Then turn on the TV or monitor to the output and then adjust VR1 until the test signal to be applied without disto...

This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip switches and ends 32 minutes later. The 32 minute duration is set by selecting the 5th bit (2^5 = 32) of a 4040 binary counter (pin 2). The timer also has a manual toggle switch so the load can be manually switched on or off and automatically shuts off after 32 minutes. The time duration can be longer or shorter (8,16,32,64,128,256 minutes etc.) by selecting the appropriate bit of the counter. The timer circuit is shown in the lower schematic just above the regulator.   Basic Clock Circuit diagram The basic clock circuit (top schematic below) is similar to the binary clock (on another page) and uses 7 ICs to produce the 20 digital bits for 12 hour time, plus AM and PM. A standard watch crystal oscillator (32,768) is used as the tim...

Know Your Types of box type subwoofer Performance subwoofer to produce low bass sound and also solid course supported by a subwoofer enclosure or box. Subwoofer box in the car usually has a different size, it is adjusted to the recommendations of the technical data from these subwoofers. However, each audio installer, have different styles in a box design. If all this time, we only know when the box was just the type that's all, it did not. Box consists of various types and models. Design, size (dimensions) and a subwoofer box models are usually clearly taken into account at the time of manufacture, even carefully designed too often acted the Installer. Clearly, each type of box has a value of strengths and weaknesses, all models of boxes, if applied correctly, clearly gives a very maximum performance subwoofer. Following this, the types of subwoofer box that is often applied in car audio: If you want us to categorize the type of subwoofer box can be divided according to several or...