GIVES BEEP WHEN WATER IS IN CONTACT WITH THE WIRE
Water is a conductor of electricity. When water is in contact with the probe then there is a flow of current which reaches to the base of Q1. Transistor Q1 is a NPN transistor which conducts. With the conduction of Q1 electron reaches to Q2 which is a PNP transistor .Q2 also conducts and current flows through the speaker. In a speaker there is inductive coil which causes motion in one direction and also produce induce current which is in opposite direction to the flow of current this induce current in the form of pulse flows through a capacitor, resistance and switches off Q1 and relax .this process repeats again and again till probe is in contact with water or we can say there is a oscillation in the circuit thus speaker diaphragm vibrates and gives a tone. Frequency of the circuit depends on the value of Speaker Coil impendence, Capacitor and Resistance Value.
Circuit Diagram of Rain Alarm
Friday, January 10, 2014
555 IC Timed Beeper Circuit Diagram
This is a simple timed beeper circuit diagram of beeper using 555 timer. This circuit can be employed to energize lights, horn, or other signaling device at any desired interval when the mercury switch is triggered. Since the current handling capability of mercury switch is not so high, an SCR is used to handle current drawn by the 555 timer circuit. Chose the SCR current rating of 500mA at minimum to safely drive the 555 IC and the relay. The relay is not needed when the current drawn by alarm is less than 200mA, in this case the alarm can be installed to directly replace the relay coil. Here is the schematic diagram of the circuit.
555-IC Timed Beeper Circuit Diagram
Thursday, January 9, 2014
1900 1990MHz is also contained in the working frequency of cell phone jammer
1900~1990MHz is also contained in the working frequency of cell phone jammer .
Brand and customer base better. Earlier from the Chinese network is one of the manufacturers to enter online, through continuous development, has formed a good brand and user base. As of the end of March 2009, page views from the Chinese network has reached 300 million times / day. In addition, from the Chinese networks literature as a grand site, as Shanda comprehensive line of wireless entertainment business, one in human resources, product integration operations (such as the original literature into online games, etc.) also has a large advantage . Chinese online (www.ChineseAll.com) was established in 2000 at Tsinghua University, is one of Chinas Internet publishing pioneer, leading to the most legitimate digital content broadcaster. At present, the Chinese online products or services related to educational institutions, government agencies, public consumption, in various market development in a leading position.
Chinese online product content, copyright and other aspects of operations and customer base are more advantages, mainly in the following points: rich, extensive resources: Chinese online digital rights in China earlier one operating company, has accumulated a rich content resources, in addition to the Internet with the original literature, but also a broad range of primary and secondary education for users, courseware and other content resources, and have literature classes, art classes, childrens class, economics and management, integrated classes, education classes, lifestyle, tools and other literary works. This type of cell phone jammer can work as long as the antenna is collectively connected and the power supply is switched on.
Resources are more extensive content partners: Chinese online now with publishers, writers, original site, the book established the upper range of content partnerships, at present, with more than 400 publishers, more than 8,000 well-known writer, mo re than 20,000 Web authors to cooperate. On the Internet, wireless Internet has a wealth of content operations experience, reading the users structure, needs, content management and control have a deep understanding. Operating experience and extensive collaboration with government departments: Currently, the Chinese already have Monternet online, mobile own business experience of cooperation, the Chinese telecom operators have a wealth of management experience working system.
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Brand and customer base better. Earlier from the Chinese network is one of the manufacturers to enter online, through continuous development, has formed a good brand and user base. As of the end of March 2009, page views from the Chinese network has reached 300 million times / day. In addition, from the Chinese networks literature as a grand site, as Shanda comprehensive line of wireless entertainment business, one in human resources, product integration operations (such as the original literature into online games, etc.) also has a large advantage . Chinese online (www.ChineseAll.com) was established in 2000 at Tsinghua University, is one of Chinas Internet publishing pioneer, leading to the most legitimate digital content broadcaster. At present, the Chinese online products or services related to educational institutions, government agencies, public consumption, in various market development in a leading position.
Chinese online product content, copyright and other aspects of operations and customer base are more advantages, mainly in the following points: rich, extensive resources: Chinese online digital rights in China earlier one operating company, has accumulated a rich content resources, in addition to the Internet with the original literature, but also a broad range of primary and secondary education for users, courseware and other content resources, and have literature classes, art classes, childrens class, economics and management, integrated classes, education classes, lifestyle, tools and other literary works. This type of cell phone jammer can work as long as the antenna is collectively connected and the power supply is switched on.
Resources are more extensive content partners: Chinese online now with publishers, writers, original site, the book established the upper range of content partnerships, at present, with more than 400 publishers, more than 8,000 well-known writer, mo re than 20,000 Web authors to cooperate. On the Internet, wireless Internet has a wealth of content operations experience, reading the users structure, needs, content management and control have a deep understanding. Operating experience and extensive collaboration with government departments: Currently, the Chinese already have Monternet online, mobile own business experience of cooperation, the Chinese telecom operators have a wealth of management experience working system.
Over voltage Protection Circuit Diagram
This is a Over voltage Protection Circuit Diagram. A silicon-controlled rectifier is installed in parallel with the 12-V line and connected to a normally-closed 12-V relay, K1. The SCRs gate circuit is used to sample the applied voltage. As long as the applied voltage stays below a given value, SCR1 remains off and Kls contacts remain closed, thereby supplying power to the load.
When the source voltage rises above 12 V, sufficient current is applied to the gate of SCR1 to trigger it into conduction. The trigger point of SCR1 is dependent on the setting of R1. Once SCR1 is triggered (activating the relay), K1s contacts open, halting current flow to the load.
Over voltage Protection Circuit Diagram
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