Apple quietly ‘abandons’ its AirPower charging pad | Power Inductor Coil

In electronics, a choke is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists of a coil of insulated wire often wound on a magnetic core, although some consist of a doughnut-shaped “bead” of ferrite material strung on a wire. The choke’s impedance increases with frequency. Its low electrical resistance passes both AC and DC with little power loss, but its reactance limits the amount of AC passed.

The teardrop fillets were supposed to help with mis-registration of the drill hole in a pad but these days if a vendor cant hit a pad with a drill then how are they going to do micro and buried vias, let alone things like via in pad.

Inventor(s): Mike Berkmyre (Princeton, TX), Vladimir A. Ukraintsev (Allen, TX) Assignee(s): FEI COMPANY (Hillsboro, OR) Law Firm: No Counsel Application No., Date, Speed: 15192976 on 06/24/2016 (928 days app to issue)

I think you are looking for a logic level mosfet with low Rds_on, but there is so many of them… I bought a few for experimenting with small, low power switchers, so shorter pulses.

Recognizable sound is produced by the rapid heating and cooling of the air around the discharge, just as with lighting and accompanying thunder. While not exactly “hi-fi,” varying audio tones, music and even speech can be output with this sort of drive system. Wingate says that he’s never tried speech, but does play recorded synthesizer music as part of his demonstrations of the new coil.

In terms of material cost its hard to say which one was actually the cheaper option, though clearly there’s less assembly and engineering costs associated with the direct PCB mount speaker than the two piece design used in the Cube. This same engineering “easy route” can be seen elsewhere in the cheaper device’s design as well, such as in the PCB antenna.

This configuration is best suited for separating high- and low-frequency current components. The most common instance is the PFC inductor and the worst case, with a ripple factor of 2.0, is the CrCM. Its frequency varies about 4:1. A Resonant Coupled Inductor, as seen in my previous article, would have a difficult time with the variable frequency. This configuration is not resonant in the operating frequency range so it operates wide bandwidth an easily yields 40 dB of attenuation over the frequency of operation. If the ripple frequency is fixed, then an inductor can be added in series with C9 and a smaller C9, sized to resonate with it. The larger either C9 or L6 become, the higher will be the noise attenuation. A stepped-up turns ratio can be used in the steering transformer for added attenuation and C9 sizing.

Buen dia Mario soy un seguidor de tus tutoriales y me parecen muy buenos he aprendido bastante de tus cursos aunque no comento en este espacio te felicito.

Police stand at the scene of a crash that damaged a transformer along Corporate Boulevard in Glasgow on Tuesday. (Photo: Adam Duvernay/The News Journal)

Had ours go boom about 2 months ago, in the Taz 5. There was an obvious hole burned in the side of it. Not sure why, unfortunately.

Inventor(s): Daoshen Chen (Allen, TX), Dianbo Fu (Plano, TX), Heping Dai (Plano, TX), Jinbo Huang (Guangzhou, CN), Liming Ye (Frisco, TX) Assignee(s): Futurewei Technologies, Inc. (Plano, TX) Law Firm: Slater Matsil, LLP (Local + 1 other metros) Application No., Date, Speed: 14739827 on 06/15/2015 (1303 days app to issue)

Thin film tolerances are as good as 0.1% and TCR is 5 to 50 ppm/C. For thick film tolerances are as good as 1% with TCRs of 50 to 200 ppm/C. Thin film also has lower resistor noise than thick film.