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  1. peter7139

    Overvoltage protection circuit or switch control circuit? Which one should I search for my project?

    Hello guys, Thank you for your suggestions!!! @itsmoked I'm trying to build one circuit base on your response. I am still a rookie but I will try my best! Thank you! I will try to update later. @Skogsgurra Actually, I am not sure about it. I just want this circuit can shut down a switch...
  2. peter7139

    Overvoltage protection circuit or switch control circuit? Which one should I search for my project?

    Hello Skogsgurra, 1. Usually, the input current is less than 2A but I will say it need to at least handle 4A to 5A. 2. No, only the generator. 3. I think few microseconds should be fine. 4. Yes, I think 75-80V is good enough. Thank you for help.
  3. peter7139

    Overvoltage protection circuit or switch control circuit? Which one should I search for my project?

    Hello everyone, I have designed a circuit that the input range is 8V to 100V and our input source varies according to spinning speed of a generator. I am looking for a chip or a circuit that can simply control a switching MOSFET. When input is over 100V, the chip will shut down the MOSFET and...
  4. peter7139

    How to design a speed sensor circuit with a monitor

    To MacGyverS2000: I am trying my best to finish my job. I know these might be a simple question for you but I am lack of experience and have no other partner can discuss with. I know how to choose a proper capacitor if the source is very stable. However, my situation is different. The...
  5. peter7139

    How to design a speed sensor circuit with a monitor

    It's still a roller coaster car. to Skogsgurra: Yes, I'd like to try your way but can you give me more information about Arduino? They have many different product. which one is best for my application? Thanks a lot!
  6. peter7139

    How to design a speed sensor circuit with a monitor

    hello guys, Thank you for all your ideas. What I really want to do is: "I want to measure speed of cars". haha. or put hall effect sensor into wheels and measure frequency or RPM and transmit data remotely to me.
  7. peter7139

    How to design a speed sensor circuit with a monitor

    Hello guys, I want to design a speed sensor which can sense the speed of a roller coaster and put the circuit on the track. Then, the circuit can transmit signals to a monitor that is about 100m away form the sensor to show the speed of the roller coaster. Is there anyone know how to design...
  8. peter7139

    A Rectifier with a Filter Capacitor

    Yes, the power and voltage will change due to different RPM. Our generator is 3 phase 12 coils and 16 magnets. How to calculate C in this case. Do I use the parameters of maximum RPM to calculate the C? and how about the voltage of capacitor? how to choose the right value? If the maximum...
  9. peter7139

    A Rectifier with a Filter Capacitor

    I am working on connecting a bridge rectifier and a capacitor to my AC 3 phase generator to get a DC power with small voltage ripple. But, I don't know how to choose a correct capacitor. Is there anyone can share some information about how to choose a right capacitor to me? My generator is...
  10. peter7139

    How to design coils size of a Radial Flux Dynamo?

    Hello guys, I have a problem about Radial Flux Dynamo. Here is the Question: Circuit board dimensions Outside diameter 8.00 inches Center hole 3.00 inches Wheel OD 9.5 inches Permeant magnets 1 X 2 X .25 thick and has 2500 Surface Gauss Power needed for 2 bulbs, 60 Watts each...

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