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Recent content by tonyctsiu

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    Fast Switching AC signal on an off

    Dear All, I am designing an AC DC which requires switching the AC power on and off to the inductor. The power of the inductor will then be fed to the other circuit for AC DC conversion. I would like to know if there is any way to switch on and off the back to back mosfets consider the mosfets...
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    bridgeless AC-DC converter

    Thank you for you guys replying. The wind mill is producing 500 hz at 15VAC actually when I blow it at wind at 40km/h.. at 10km/h the wind mill produce 3VAC at 100Hz. I think if the wind mill is not generating high enough voltage, we can some up boost it up to produce enough voltage for...
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    bridgeless AC-DC converter

    I am developing a wind mill powered bright LED. The windmill generates power from 0-30vAC depending on windspeed. The target operating input voltage of the AC-DC circuit is 2-40vAC. The LED operates at 3V or 6VDC (1-2LEDs) I have found the papers below which discuss how to convert AC to DC...
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    Small Wind Generator AC to DC Circuit

    Dear Kam, Thank you for your reply. The reason why I need to use AC generator is that it there is commutator in the simple DC motor which create friction.
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    [SOLVED] using 8051 as SEPIC DC-DC Converter

    Dear All, If I have a voltage input from a generated powered by wind mill. The power generated ranges from 0-40V I want to use this power to simply power a 3V Cree LED. It seems to me that I can create a SEPIC DC-DC circuit and a current mode DC-DC converter IC to provide constant current to...
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    Small Wind Generator AC to DC Circuit

    Thanks! it really help!
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    Small Wind Generator AC to DC Circuit

    I am working on a project which uses a wind generator (basically a 10cm diameter windmill driving a motor as a generator giving AC current) to power a ~1W LED. I would like to convert the AC power given by the generator in to DC. Apart from using bridge rectifier which gives around 0.5-0.7V...
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    FCC Rule 15.245 Vs 15.249

    Dear All, I am planning to make a device which operates at 915Mhz frequency and trying to make it compliance to FCC rules. No frequency hopping. I am not sure whether I should follow 15.245 or 15.247 as it seems there might be some contradictions: In 15.245, it says the maximum field strength...
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    Lattice Type Balun Calculation

    Dear All, I am figuring out how the CC1110 balun is calculated based on the suggestion of the IEEE paper to verify the values of the lumped element suggested in CC1110 433 Reference design: Lumped and Distributed Lattice-type LC-Baluns in microwave symposium digest 2002 Volume1 Please find...
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    How to Change Ground Symbol Size in Agilent's ADS

    Dear All, Encl. please find the attachment. In Agilent's ADS I have changed the technology from mil to micron. Then the GND symbol in layout view becomes very small. How can I change it back in to normal size? Thanks in advance! Tony
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    CC1110 BALUN tuning with Network Analyzer and Spectrum Analyzer

    Dear All, I am trying to design a circuit using TI's CC1110. I am going to follow the TI's reference design for the balun. The output impedance of the CC1110 at 915 mHZ is a differential complex impedance 86.5+j43. I have to then convert it into an unbalanced 50ohm port with a series of low...
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    Why WIFI consume significantly more power than normal 2.4GHz Wireless IC

    Dear Sir, I have searched thru the web about some WIFI chips and some ordinaly 2.4G RF Transceiver like CC2530. Most WIFI chips consumes 150mA during transmitting or receiving while CC2530 consumes only 30mA. What causes such significant difference? Regards, Tony
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    Calculating S parameter of the sub network

    Given the following 2 port network: Port 1 (Z0) Transmission Line1->Sub Network->Transmission Line 2->Port 2 (Z0) Line1 = has impedance of Z0 and electrical length of θ1 Line1 = has impedance of Z0 and electrical length of θ2 Sub Network has S parameter of S11', S12', S21' and S22' The whole...
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    Hall Effect current pulse with 1 uS response time

    Dear Mr. Prototyp_V1.0, Many thanks for your reply. I should have written clearly that the way I wish to detect current is to make it thru Hall effect. It is because I need an non-intrusive way of detecting current. There seems to be many hall effect detectors around. The closest one I found...
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    Hall Effect current pulse with 1 uS response time

    Dear All, I just wonder if there is any existing components which : 1. detect current pulse with 1 uS response time 2. consumes less than 1 mA 3. is small enough to be fitted into a mobile phone Thank you and best regards, Tony

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