Showing posts with label phone. Show all posts
Showing posts with label phone. Show all posts

Saturday, January 11, 2014

After cell phone jammer has been used for several times

After cell phone jammer has been used for several times. 
Hybrid satellite and terrestrial solutions to the countries covered by geostationary satellites in low-power repeater network and the mobile base station co-location, to provide urban and indoor coverage. The manufacturers argue that, if you do not use the S-band in the country coverage of the DVB-H in UHF is not economical because it requires a large number of transmitter and receiver. The market is still before the analog shutdown mode, the lack of available digital spectrum to support deployment of this technology, at the same time, the S-band frequency bands are available in any place. Manufacturers are expected to DVB-SH will commence in Europe for land the citys commercial, the end of 2007 to 2009, there will be a dedicated satellite to provide country-wide coverage. The product description of cell phone jammer should be as exact and accurate as possible.
But each side is the lack of adequate dominant industry chain parties seems to be "co-operation", but in reality there are some differences in the distribution of benefits, rights and responsibilities, payment. Mobile payment, the killer application of the operators. Operators, mobile payment is different from the direct consumption of mobile phone ring tones, mobile games and other value-added services, it belongs to the node type, interface type of business, is the pay part of the new channels open up commercial activities. Therefore, mobile payment is similar to the "qigong" in the martial arts, its role is fundamental, permeability, promoting other business consumer. At the same time, although early in the development of mobile payment can not effectively bring commission income, but can bring some traffic income. The battery of cell phone jammer should be recharged for about five or six hours.
Moreover, as a strategy, trends, business, help to attract new customers, retain old users. Therefore, operators should seize the phone pay by 3G tendency to accelerate development opportunities, a clear development goals, integration of all resources, conditional step by step to carry out mobile payment services. The mobile payment operators to go from here. In general, operators should reshape the core position in the field of mobile payments, seize the commanding heights of mobile payment industrial chain. From the necessity, first, to avoid the pipeline: the bank or third-party mobile payment mode, the operator only as a SMS to confirm the authentication channel, failed to produce the brand in the customer interface.
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Sunday, September 29, 2013

5V DC REGULATED PHONE CHARGER ELECTRONIC DIAGRAM


5V DC REGULATED PHONE CHARGER ELECTRONIC DIAGRAM

Regulated phone charger which is used as an emergency charger for mobile phones with source from ordinary batteries, and works with 1.5V input DC voltage. At 5V, it can provide output to 70mA. If the current is drawn, the voltage will be drop. A006 microcontroller is used to create square wave which used to drive the Field Effect Transistor BBV93.
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Tuesday, September 3, 2013

Phone Hold With Music Circuit

Circuit Diagram 

Description
This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold. The circuit operates as follows: The RED wire from the phone jack is typically positive and the GREEN wire is negative or ground. When you want to place a call on hold, close S1 and hang up the handset. The resistor R1 simulates another phone off hook and allows enough
current to pass through to prevent the phone company from disconnecting the call. The resistor R2 and LED provide a visual indication that you have someone on hold ( this is optional )
The capacitor C1 and the transformer provide the interface to a radio or CD player headphone jack. Before you hook up the project to the phone line you must determine the polarity of the line. Place a voltmeter across the red and green wires of the telephone line, there should be about 48 volts
DC positive when the black lead of your meter is connected to the green phone wire. If it is negative 48 volts then reverse the wires.

Source -http://www.electronics-lab.com/
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