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Useful for power lines control, Simple, transformer less circuitry. This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs to be detected. D3 illuminates when the line voltage is approaching 120V and will remain in the on state also at 240V supply. On the other hand, D6 will illuminate only when the line voltage is about 240V and will stay on because the latching action of Q1, Q2 and related components. C1, D1 and D2 provide a low dc voltage in the 4.5V - 6V range in order to allow proper operation of latch circuit and LEDs. 110 and 220V AC LED Voltage Indicator Circuit diagram: 110 and 220V AC LED Voltage Indicator Circuit Diagram Parts: R1__________470R 1/2W Resistor R2__________220K 1/4W Resistor R3,R7_______470R 1/4W Resistors R4__________1K 1/4W Resistor R5__________2K2 1/4W Resis...

I had previously used the Adafruit TFT display using my library (ported from the Adafruit Arduino library). I decided to optimize the library to improve drawing speed. The same display I use comes with a 4-wire resistive touch-screen as well. I decided to write a simple library for the touch-screen and give Protothreads a try. To incorporate all this, I thought it would be cool if I used these to make a simple game. Tic-tac-toe came to mind as a fun little demo. I'm sure everyone's familiar with the game so I won't explain the rules there. The touch-screen is simply two resistive sheets placed on top of each other on top of the TFT screen. When it is pressed down at a given place, the two sheets make contact and a voltage divider is formed. Using the IO's and the ADC, this voltage is read in the X and Y directions to register a touch. Here is a very good pictorial depiction of the resistive touch screen (taken from the Atmel AVR341 document ): So in order to read the to...

The family of Eddie Smith has auctioned off their late father's 1967 Ferrari 275 GTB/4*S N.A.R.T Spider, and generously donated all the proceeds to charity. The rare car (only 10 were ever made) was sold Saturday night at RM Auctions in Monterey, Calif., for $27.5 million. That price set a new world record for the most expensive road car of any kind sold at auction.  Smith took ownership of the Ferrari in 1968, and his son, Eddie Smith Jr., told the auction crowd that selling it was "a bittersweet moment." According to the Los Angeles Times, he advised its new owner to "Drive it, love it, enjoy it, and more importantly share it with others so they can see it." [Source] [Source  ] Trending topic: ferrari auctioned | Click to see more on msnNOW.com

Rotel SURROUND SOUND RECEIVER RSX-1057 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 120 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) Rotel SURROUND SOUND RECEIVER  RSX-1056 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 115 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) RSX1056 power schematic RSX1056 Power amplifier schematic and PWB RSX1057 Power schematic RSX1057 Power amplifer schematic and PWB

This Mini Voltage Source with Adjustable Current Limit variable is very simple and efficient, ideal for small shippers or circuits that require a current limiter with adjustable voltage that this circuit can vary from a few mA up to 2 A and voltage 1.225v up to 12V or more, depending on the power supply. Adjustable Voltage and Variable Current Limiter Circuit Diagram Once the current reaches the limit set by the 100R resistor, transistor BC547 begins to act on the voltage regulator in the Adj pin and the output voltage starts to decrease. If the output is shorted, the output voltage will reduce to almost zero, as a kind of protection.

Nokia is preparing for the possibility of some additional products for Microsoft than Windows Smartphone Phone 7. One such product is a dual-screen device that can display 3D images, while the other is a tablet Windows 8. Both these gadgets have not confirmed its existence by Nokia's device with dual screen is visible from a patent application by Nokia on April 21, then under the name "Autostereoscopic Rendering and Display Apparatus" or a display device and processing autostereoskopik. According to those files, this device consists of a sensor arranged to detect the position and orientation of one's view of the auto-stereoscopic display. There is also a processor that is configured to determine the surface of an object that can be seen in 3D user, and an image generator arranged to create an image received by the right eye and left a visible 3D auto-stereoscopic. From the pictures included in the patent is expected to have a 3D image processing screens and other scr...

In this article I will discuss what switch bounce is and some ways to deal with it. First I will take you through the theory, and later I will show you some ways to handle it in both hardware and in software. Recommended level Beginner Theory What is switch bounce? When you push a button, press a mico switch or flip a toggleswitch, two metal parts come together. For the user, it might seem that the contact is made instantly. That is not quite correct. Inside the switch there are moving parts. When you push the switch, it initially makes contact with the other metal part, but just in a brief split of a microsecond. Then it makes contact a little longer, and then again a little longer. In the end the switch is fully closed. The switch is bouncing between in-contact, and not in-contact. "When the switch is closed, the two contacts actually separate and reconnect, typically 10 to 100 times over a periode of about 1ms." ("The Art of electronics", Horowitz & Hill, Sec...

Hi every one...Today i am here again with another very important article for beginners.in this article we are going to discuss about some commonly used electronic component and their symbols. you must be familiarized with these symbols for better understanding of circuit diagrams. WIRES Simple wire Used to connect one component to another. Wire joined One device may be connected to another through wires. This is represented by drawing “blobs” on the point where they are shorted. Wire not joined When circuits are drawn some wires may not touch others. This can only be shown by bridging them or by drawing them without blobs. But bridging is commonly practised as there will not arise any confusion.    RESISTORS                                     Resistor A resistor is used to restrict the amount of current flow through a device. Abbreviated as ‘R’.           ...