Matt circuit

The circuit described here protects your electrical appliances like AC motors from damage due to low voltage at power-on. It remains standby without giving power to the load after power resumes. The load can be switched on only manually. This prevents damage to the device if it is 'on' when power resumes. unregulated power supply is derived from a 12V-0-12V, 300mA step-down transformer and rectifying diodes D2 and D3. The rectified DC is made ripple-free using capacitor C3. An audio/video indicator (piezobuzzer and LED3) is provided along with the power supply for power resumption. When power is switched on, capacitor C4 charges through the piezobuzzer and LED3, making both of them active. The piezobuzzer beeps and LED3 glows for a few seconds. When capacitor C4 is fully charged, the cathode of the LED becomes high inhibiting further flow of current through the buzzer. When the power is off, capacitor C4 discharges through resistor R9. The circuit uses IC CA3140 (IC1) as a volt...

You can download it in PDF format here: http://ifile.it/84hw0eg

Used ICs: JRC4558, TDA7266SA, NCP1606B, LD7531, 5A500V[FET], SG3525, LM358,  Audio output SMPS [Click on the schematics to zoom]

The circuit is devote to the radio receiver in which sound ( the gear ) is weak. With the help of this tool , which initially sounds as if far to be clearly audible. Power amplifier does not require much  electrical current source , because all components are not up to over 1 Mega . But the result was incredible because it can enhance the power of  catching the wave signal. Troubleshooting : Wether transistors placement is correct ? Placement Elco ? Check are cable . If all components have benn checked , and the damaged has been replaced . Then try , turn the potentiometer slowly and listen to how the sound output by the speaker.

This is the circuit diagram of Rain and Water Alarm circuit . This circuit generates alarm sound when its sensor is witted by water which make a short circuit (connection) between X and Y. A tone of about 1kHz which can be hear while detecting water, is provided by a stable multivariate from timer IC 555. The sensor when witted by water completes the circuit and causes the 555 oscillate at about 1kHz. It has to placed generating an angle of about 30 – 45 degrees to the ground. This tends to make the rain water to flow over it towards the ground and prevents the alarm from going on because of the stored water on top of the sensor. The metal implemented for making the sensor is required to be aluminum and not copper. This is simply because copper forms a blue oxide on its layer on prolonged exposure to moisture and needs to be cleaned on a regular basis.The aluminum foils may be secured to the wooden / plastic board via epoxy adhesive or small screws. The connection between X and Y fro...

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 amplifiers 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 frequency, 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 ar...

It would be nice and comfortable doing our work and what we needed are readily available to save time and effort. It lessens the hassle of looking for missing pieces or even using multiple devices to check the accuracy and effectiveness of the equipments we are using. Just like this switch box that has a capacitor and resistor in one unit. It will be easier and faster to check the capacitance and resistance by switching the knobs. This device may look old-fashioned but can really come very handy. This is simple and not that expensive to make and very useful in electronic projects or for the purpose of collecting devices for future use.

The network got the information about the upcoming smartphone ZTE Blade S6. By design, the model resembles the iPhone 6 Plus and probably designed to compete with him. Smartphone ZTE Blade S6 is built on a 64-bit, eight cores MediaTek MT6752 processor with a clock speed of 1.5 GHz and running the operating system Android 4.4.4 KitKat. RAM is 2GB, and built-in - 16 GB. The China's ZTE launches Firefox phones in US, Britain   The smartphone features a 5.5-inch touchscreen display with a resolution of 720p and an 8-megapixel camera. Model dimensions of 157 x 78 x 7,9 mm, weight - 160 g Besides performance, the network got official image and photo devices. While there is no reliable information on release dates and price of this model, but the online retailer Gearbest said it will release ZTE Blade S6 in the international sale in the coming weeks.

  Android 4.4.1 landing soon and fixes Nexus 5 camera . The Nexus 5 from Google is quite an awesome device, however its camera isn’t the greatest. Even though the Nexus 5 ′s camera features a optical image stabilization, taking shots from it are painfully slow and generally out-of-focus. Google is aware of this and as per The Verge, a new update scheduled to be released in the next few days fixes a lot of issues with the Nexus 5 camera. They’ve managed to get a hands-on experience with Android 4.4.1 and here is what they have to say: Speed is a theme for the update, and the Nexus 5 ′s camera really does feel faster across the board. The app launches a full second quicker than it did before the update, meaning you’ll miss many fewer shots than before. There’s also a new progress indicator in HDR+ mode, which makes the process, longer by necessity, feel a lot more straightforward. It’s the first of what Burke says will be a series of interface changes, as Google tries to make Andro...

Spesification of this amplifier is high enough , and require a lot of expense to make this super-power amplifier. In the transformer using 20A and manufactered / branded ERA , ERA trafo is one of the best transformer , in addition to the power amplifier as well as power supply adapter , regulator , stabilizer , charger , etc. Because copper is intact , a strong iron and did not issue a frequency so that when the amplifier is turned on , output sound amplifier no buzzing. So if you in choosing a transformer , do not hesitate to use the transformer branded ERA.   Above and below the picture is the end of the amplifier circuit, so-called booster amplifier. Picture above using 14 pairs of transistor MJ15025G and his partner MJ15024G . Transistor price range of $5 - $6 , has power output of 250W on each transistor , for more details , see datasheet of each transistor. Click to view larger Installed transistor with resistor but still a mess Transistors MJ5025G and MJ15024G very fith with...

This circuit have applied to line detection of robot project, Good match between the transmitter and the detector is important for proper operation, especially if the hole is large. Robot with a simple object or obstacle detection. Infrared Transmitter detector pair sensors are relatively easy to implement, although involved some degree of testing and calibration in order to make correct. They can for the impediment, motion detection, transmitters, encoders are used, and the color detection. Infrared Emitter and Detector using IC 74LS14 Circuit Diagram: This can be done with a piece of rope stretched between and in accordance with LED and phototransistor. A length of stiff wire or plugs can be used to set the alignment. Another method that can be used for long distances is a laser pointer shone through a hole.

Samsung 32 inch CRT TV - power and audio output circuit diagram SMPS Sub-power Audio output Click on the schematics to magnify

 Introduction: After the Samsung Galaxy S3 was released, there were many rooting tools introduced into the market due to its increase in demand. Rooting the OS can help us do many custom operations like unlocking, customization of apps, different ROMs, custom kernels etc. Once you root your mobile, you can have better custom control over it where you can perform lot of operations. It is a tricky process and should be carefully carried out. If the processes are not followed exactly that might leave the phone damaged and dead. While rooting the phone, make sure you are doing the processes safely by following the steps below. By rooting the phone, you are actually removing the mobile OS restrictions from the internal system of your device. After you finish rooting on your device, you can have complete access to the operating system and the internal system of your device. Once rooted, you can customize your device’s system to,     Install custom apps,     Remove internal built-in apps,    ...