TREE

This time, there is a series of audio amplifer 20W as well, but using IC TDA 2005 as a series of his base amplifier. The series of 2x20 Watt Audio Power Amplifier using TDA2005 can you see in the picture below. Technical Data: Performance of TDA2005M: (for this circuit); At 4.14 V supply voltage: 2 x 20 watts (stereo) into 4 Ohms. Distortion: Approx. 0.2% at 4 Watts into 4 ohm load. Frequency Range: Approx. 20 Hz to 22 KHz. Input Sensitivity: Approx. maximum 150 mV rms. . Power supply: + 8 to 18 volts, approx. 3.5 Amps maximum per channel. source [link] 

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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...

This is a 8-Channel DTMF : Encoder Circuit Diagram. Generated millions of times every day by our telephone keypads, the eight DTMF frequencies were chosen so that the harmonics and intermodulation do not generate significant in-band signal levels. The signal is encoded as a pair of sine waves, ensuring that no frequency is a multiple of the other and the sum and difference between two frequencies does not match any single tone and that’s why DTMF sounds so ugly!T he DTMF encoder circuit show n here is based on the HT9200B tone generator device produced by Holtek and distributed by Futurlec  among others. The encoder is complemented by a decoder elsew her e in this publication. 8-Channel DTMF : Encoder Schematic The HT2900B is supplied as a nice old fashioned 14-pin device. It can be instructed by a microcontroller to generate 16 dual tones and (in serial mode only) 8 single tones from the DTMF pin output . It s 8 - pin ‘ younger brother’ the HT9200A provides a serial mode only wher...

In the last blog post, we lacquered the neck on our vintage Hofner Colorama II guitar . Today we will paint the body. Before painting, we do a last check for anything we may have missed, like scrapes or gouges in the wood. This leads us to discover that the raw plug/screw anchor that someone had inserted to hold on the rear strap button, and which we were just going to leave, is, in fact, just half a raw plug. So, out it comes: A new hole is drilled: A wooden plug is cut: Glued in: And filed/sanded flat: Finally, we drill a new strap button hole: Et voilà. Also, since we're at it, let's drill a hole from the control cavity through to the tremolo area, so that we can earth (ground) the tremolo unit when we put this thing back together: Now on with the show. A quick mounting system needs to be fabricated, so we cut a piece of wood that can be attached to the neck pocket. We drill a hole in it too, so that we can hang it up. We’ll also put a screw in the rear strap button hole t...

The following display features eight 7-segment displays arranged in two rows of four digits. The on-board MAX7219 driver enables you to easily add eight 7-segment LED displays to your project using only 3 I/O pins of microcontroller. The major advantage of using this board is the time-division multiplexing operations required for continuous refreshing of the display digits are performed by the MAX7219 chip, thereby keeping the microcontroller free for doing other pressing tasks. It is suitable for displaying two variable values simultaneously in a project, such as displaying temperature and humidity, or current and voltage, etc. [ ]