Showing posts with label cost. Show all posts
Showing posts with label cost. Show all posts
Friday, September 12, 2014
Latest Tab Google captures your 3D environment It cost U S 1 024
Google introduces its tablet the Tango Project, a project that handles allow you to create 3D maps of the environment of a mobile device.
The Project Tango Tablet, as Google calls it for now, is mainly designed for developers interested in exploring the future of 3D technology on a mobile device can do so and to develop new features that may allow it to another level bringing this technology, as mentioned Google.
The 7-inch tablet that goes on sale later this year is priced at U.S. $ 1.024, making it not the cheapest in the market.
However, Googles tablet was created with help from Nvidia to allow create internal maps of buildings in 3D, thanks to various cameras and sensors that are in the device. The tablet has a Nvidia Tegra K1 processor, 4GB of RAM, 128GB of storage, Wi-Fi and 4G LTE.
Although the Tango Project or Project Tango would be in its initial phase, the new tablet could help take an important step for this kind of technology can reach consumers in the future.
Friday, September 5, 2014
build a Low Cost Stereo Level Indicator
Usually, Low-Cost Stereo Level Indicator home stereo power amplifiers don’t have output level indicators. An output power level indicator can be added to each channel of these stereo power amplifiers. As low levels of the output power are not disturbing and damaging to the people, there is no need to add a preamplifier and low-level detector before IC LM3915. But you should know when the output power becomes considerably high.
Here we present a very simple, low-cost stereo-level indicator schema for home power amplifiers with power rating of around 0.5W. The schema is built around two LM3915 dot/bar display driver ICs (IC1 and IC2). LM3915 senses analogue voltage levels to drive ten LEDs, providing a logarithmic 3dB/step analogue display.
Stereo Level Indicator Circuit Diagram
Here we present a very simple, low-cost stereo-level indicator schema for home power amplifiers with power rating of around 0.5W. The schema is built around two LM3915 dot/bar display driver ICs (IC1 and IC2). LM3915 senses analogue voltage levels to drive ten LEDs, providing a logarithmic 3dB/step analogue display.
Stereo Level Indicator Circuit Diagram
The voltage levels below 1V are not important because these correspond to a low level of the audio signal. Similarly, input voltage levels above 30V correspond to too high levels of the output power, which are not applicable for home power amplifiers. So the voltage levels of our interest are 1V to 30V, which can be handled directly with LM3915. LM3915 needs no protection against ±35V inputs, which simplifies the schema.
Most audio power amplifiers can drive 2-ohm to around 32-ohm loads. A load of several kilo-ohms will not change the conditions for the amplifier. CON1 is the input connector and CON2 output connector for the loudspeaker or headphone. Each channel has its own LM3915 and ten LEDs to indicate the power level. To indicate the different audio levels, select LEDs of three colours as per your liking. For example, you can have five green LEDs, three yellow LEDs and two red LEDs.
If appropriate signal generators and measuring equipment are not available, the level indicator can be calibrated based on personal observations. For example, the audio signal should be in the green LEDs zone when the signal is strong enough but not irritating, in the yellow zone when it is disturbing or starting to get distorted, and in the red zone when it is heavily distorted or too strong to listen to in the room.
Calibration can be done with the help of potentiometers VR1 and VR2, which are optional. Switches S1 and S2 let you select between two modes of LM3915 operation—the bar mode and the dot mode. These too can be removed or replaced with jumpers, if not required. When the switches are removed, leave pins 9 of IC1 and IC2 open.
The schema works off regulated 12V. You can also power it through a 12V rechargeable battery.
Assemble the schema on a general-purpose PCB and enclose in a suitable cabinet. Fix all the LEDs in two rows on the front side of the cabinet. Also affix the two terminals for input and output on rear side of the cabinet. link
Most audio power amplifiers can drive 2-ohm to around 32-ohm loads. A load of several kilo-ohms will not change the conditions for the amplifier. CON1 is the input connector and CON2 output connector for the loudspeaker or headphone. Each channel has its own LM3915 and ten LEDs to indicate the power level. To indicate the different audio levels, select LEDs of three colours as per your liking. For example, you can have five green LEDs, three yellow LEDs and two red LEDs.
If appropriate signal generators and measuring equipment are not available, the level indicator can be calibrated based on personal observations. For example, the audio signal should be in the green LEDs zone when the signal is strong enough but not irritating, in the yellow zone when it is disturbing or starting to get distorted, and in the red zone when it is heavily distorted or too strong to listen to in the room.
Calibration can be done with the help of potentiometers VR1 and VR2, which are optional. Switches S1 and S2 let you select between two modes of LM3915 operation—the bar mode and the dot mode. These too can be removed or replaced with jumpers, if not required. When the switches are removed, leave pins 9 of IC1 and IC2 open.
The schema works off regulated 12V. You can also power it through a 12V rechargeable battery.
Assemble the schema on a general-purpose PCB and enclose in a suitable cabinet. Fix all the LEDs in two rows on the front side of the cabinet. Also affix the two terminals for input and output on rear side of the cabinet. link
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