Showing posts with label on. Show all posts
Showing posts with label on. Show all posts
Monday, November 3, 2014
ON OFF VIA MOMENTARY PUSH BUTTONS
ON - OFF VIA MOMENTARY PUSH-BUTTONS
This circuit will supply current to the load RL. The maximum current will depend on the second transistor. The circuit is turned on via the "ON" push button and this action puts a current through the load and thus a voltage develops across the load. This voltage is passed to the PNP transistor and it turns ON. The collector of the PNP keeps the power transistor ON.
To turn the circuit OFF, the "OFF" button is pressed momentarily. The 1k between base and emitter of the power transistor prevents the base floating or receiving any slight current from the PNP transistor that would keep the circuit latched ON.
The circuit was originally designed by a Professor of Engineering at Penn State University. It had 4 mistakes. So much for testing a circuit!!!! It has been corrected in the circuit on the left.
source : http://www.talkingelectronics.com.au/projects/200TrCcts/200TrCcts.html
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This circuit will supply current to the load RL. The maximum current will depend on the second transistor. The circuit is turned on via the "ON" push button and this action puts a current through the load and thus a voltage develops across the load. This voltage is passed to the PNP transistor and it turns ON. The collector of the PNP keeps the power transistor ON.
To turn the circuit OFF, the "OFF" button is pressed momentarily. The 1k between base and emitter of the power transistor prevents the base floating or receiving any slight current from the PNP transistor that would keep the circuit latched ON.
The circuit was originally designed by a Professor of Engineering at Penn State University. It had 4 mistakes. So much for testing a circuit!!!! It has been corrected in the circuit on the left.
source : http://www.talkingelectronics.com.au/projects/200TrCcts/200TrCcts.html
Sunday, September 21, 2014
The evolution of Google TV based on Android completely L
We already knew Google TV, the company system to reach televisions and decoders of our homes. However, the system never made it to be very successful, mainly due to her lack of interest from developers who did not take many applications to this platform. Now, Google announced at its Google I / O 2014 the evolution of the system and now called Android TV.
Unlike Google TV, Android TV would be complemented based on pure Android code L, the new version of the mobile operating system of the company. This would allow developers to easily modify their applications to work directly on this platform, like Android-L (cell phone and tablet) and Android Wear, and not having the need of having to create an entirely new application for this new TV platform.
Currently, a number of applications found on Android and work on the big Lcd TV featuring Android, such as music, games, movies, and more. It is precisely in the area where Android TV game also differs from its predecessor Google TV. Android TV also has a focus on video games, allowing a system is not only television, but also functions as a mini console.
Android TV can be controlled through an Android phone or tablet with L, like a television remote control or video games. In fact, manufacturers are the ones who decide how to offer it in the beginning, is control video game control specially designed for Android TV or regular monitoring of television and users can can choose to use their phones or tablets at any time.
Overall, Android TV interface is very graphical and easy. It works very smoothly and shows you on the home Lcd content recommendations can like, given your history seen or used content, like video games and apps.
Each application has a similar structure where you find a hidden phenomenon on the left side and the other on the right information. The start menu displayed when you open the application and then closes when you enter the information tine each of those categories or play any kind of content.
It has been said that unlike Android mobile phones, Google would control interface and thus offer TV Android experience to users. Thus, manufacturers may not make major changes to the design of Android TV, but if you can add your own content. From now on, the SDK is enabled for developers begin to experience the new Google TV platform and modify or create their applications to be compatible with Android TV.
Monday, August 11, 2014
10W Audio Amplifier circuit based on TDA1910
Simple and cheap, thats the advantage of this schema. Although the output power is not high but audio quality is good, because TDA1910 has a very low noise feature. This schema suitable for use as a student project.
About TDA1910:
The TDA1910 is a monolithic integrated schema in MULTIWATT® package, intended for use in Hi-Fi audio power applications, as high quality TV sets.
The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.
TDA1910 Features:
- muting facility
- protection against chip over temperature
- very low noise
- high supply voltage rejection
- low “switch-on” noise.
Download TDA1910 Datasheet for complete TDA1910 reference
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