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Showing posts from December, 2016

LED Power Meter

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LED power Meter circuit is a simple RF detector using diodes to charge a capacitor. The voltage developed across the capacitor is indicated by a multimeter set to a low voltage range. The circuit is soldered together without the need for a PC board , as can be seen in the diagram below and paper clips are used for the positive and negative terminals of the multimeter. The level power output of an FM transmitter is indicated by the illumination of a LED and the voltage reading on the multimeter gives a further indication of the output. A digital multimeter may be used but the presence of RF may produce a false reading. Likewise, the radiated energy may upset some analogue meters and you may get full scale deflection on the 15v range as well as the 250v range! But the LED won't lie. It will accurately indicate the RF and you can see the change in brightness as you adjust the coils in the output stage. Some of the cheapest and simplest multimeters will give the best results as

Speaker headphone switch power amplifier BA5210FS

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Circuit diagramspeaker / headphone switch power amplifier BA5210FS Datasheet for  BA5210FS: Download

Aluminum iPhone 5 Coming Next Fall

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Sources have told BGR the iPhone 5 will indeed be a complete redesign, with an appearance much like the form factor of the iPad 2. The front glass of the next generation iPhone will be connected to an all-aluminum back via a rubberized bezel. The mockup below illustrates what the aluminum iPhone might look like. The bezel is said to be made of a similar material to the Apple Bumper cases. Not only would this bezel conceal a completely redesigned antenna system, it sounds like this would help make the iPhone 5 less slippery to hold. After all, the machined aluminum found on the iPad 2 is slick in more ways than one. BGR is confident the next iPhone will not see the light of day until next fall, which puts the release date approximately one year after the iPhone 4S launch. The days of a summer iPhone release seem to have fallen to the wayside for the time being. When it comes to the cellular antenna, using the rubberized bezel would permit Apple to configure the antenna without needing