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The company announced today that it now has 100 million worldwide users taking advantage of its free phone calls, texting, and photo-messaging services. It's not clear if those users are actively using the service or have just signed up. Still, the company claims to handle over 2 billion minutes of calls and 6 billion messages every month. An average of 10 million calls are placed each day.  Viber has established itself as a true competitor to Skype, the popular VoIP service now owned by Microsoft. Viber works across iOS, Android, and a host of other mobile platforms, and allows users to communicate with others for free. In addition to announcing its milestone, Viber said today that it has launched a new version of its service for Nokia's Lumia line of Windows Phone 7 devices. The app allows owners to place free HD-quality phone calls and hold group-messaging sessions. Users can also send out free text and photo messages. To further commemorate its milestone, Viber announced th...

Circuit diagram: 100 watt LM391 Audio Power Driver   Datasheet for  LM391: Download

The circuit in this Design Idea makes a voltmeter that reads to 0.99V. The idea uses a counter IC to drive two sets of four LEDs (Figure 1). Each of these two sets represents a BCD (binary-coded-decimal) value. With all of the LEDs off, the voltmeter reads 0V. With all of the LEDs on, the reading is 0.99V. Op amp IC1A generates a predictable voltage ramp. Figure 1 You use op amp IC1B as a comparator to compare the ramp to an input signal. The higher the input voltage, the longer the output pulse from IC1B is. You use this pulse to gate free-running oscillator IC2B. A potentiometer on this multivibrator circuit allows you to adjust the full-range count. The voltmeter has a maximum input of 1V and uses three dual-part packages. You make output counter IC3 work as a two-digit counter by strapping the enable pin of the IC3B part to the MSB (most-significant-bit) output of the IC3A part. A dual op amp is used to create the comparator function and the ramp generator. The design also uses a d...

Power Amplifier TDA7294 is a power amplifier with IC Power Amplifier is a mono 100W Class AB operation of OCL. The power supply circuit. Positive, negative, and ground. Usually, we use the power supply circuit to + /-25V to + /-35V at 100W RMS will be used to heat sufficiently. After many members have already made the TDA7294 as I know, with a sound quality that is the very gods or Hi-End itself. Several days before the member’s PM to me saying that I had an amplifier using IC TDA7294 to have more of the same. Higher power. And low heat. Achieved by increasing the voltage raising circuit For the more, it means high power and high heat up. Today I have come across. I use IC TDA7294 circuit at the time. In-Home Use amplifier circuit is a Class G amplifier with low power consumption, resulting in the loss of a 20V DC power less. And when you’re driving a high-power random access is party to a rhythm. Principles to do it. I took out a membership you ...

Power Amplifier TDA7294 is a power amplifier with IC Power Amplifier is a mono 100W Class AB operation of OCL. The power supply circuit. Positive, negative, and ground. Usually, we use the power supply circuit to + /-25V to + /-35V at 100W RMS will be used to heat sufficiently. After many members have already made the TDA7294 as I know, with a sound quality that is the very gods or Hi-End itself. 100 Watt Power Amplifier Circuit With IC TDA7294 Several days before the member’s PM to me saying that I had an amplifier using IC TDA7294 to have more of the same. Higher power. And low heat. Achieved by increasing the voltage raising circuit For the more, it means high power and high heat up. Today I have come across. I use IC TDA7294 circuit at the time. In-Home Use amplifier circuit is a Class G amplifier with low power consumption, resulting in the loss of a 20V DC power less. And when you’re driving a high-power random access is party to a rhythm. Princi...