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North Korea makes home grown Arirang smartphone

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  By Dave Lee Technology reporter, BBC News North Korea says it has produced its first home-grown smartphone, but experts have disputed its origins. The Arirang handset, described as a "hand phone" in state media, was shown to leader Kim Jong-un during a factory tour. The country has had a mobile network since 2008, but activity is heavily monitored and restricted. Last year the country launched a tablet, but it later emerged it was likely to have been made in China. Clues to the tablet's origin were uncovered by Martyn Williams, an expert on North Korean technology, who noted that parts of the tablet's software code suggested links to a manufacturer in Hong Kong. The Arirang smartphone, named after a popular folk song, was unlikely to have been made in the country, Mr Williams added. He noted that actual manufacturing was shown, and that the device was "probably made to order by a Chinese manufacturer and shipped to the May 11 Factory where they are inspected...

2 X 30Watt home amplifier circuit

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Audio amplifier circuit is very suitable for use at home, using a subwoofer speaker, or woofer speaker. Usually, also called home amplifier, audio amplifiers are based on the IC and ic are used still in series with type STK457 STK and besides it also can use the STK459, 460, 461, 463, 465. And each ic has the quality of each one, please look at alldatasheet.com. Part List : R1 = 22K R2 = 22K R3 = 330R R4 = 33K R5 = 1K R6 = 1K R7 = 4.7R R8 = 3K3 R9 = 3K3 R10 = 4.7R R11 = 100R R12 = 33K R13 = 330R C1 = 0.1uF C2 = 0.1uF C3 = 100uF C4 = 100uF C5 = 0.1uF C6 = 47uF C7 = 47uF C8 = 0.1uF C9 = 100uF C10 = 100uF U1 = STK457,STK459, 460, 461, 463, 465.