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  1. hevans1944

    CASIO Keyboard Power

    So glad to hear your earlier adventure did not "brick" your keyboard! No bourbon necessary, just glad to be of some help here. A few years ago, in the previous century, I fancied I might want to do something "electronical" with music. So I purchased a Roland synthesizer, a MIDI piano keyboard...
  2. hevans1944

    4-20mA Current loop transmitter for RPM Measurement

    You have only asserted, not established, that the transducer produces analog data. Because of the extremely wide range of frequencies the transducer allegedly handles, I made a (possibly incorrect) assumption that it produces digital pulses in the range from 0.0005 Hz to 50,000 Hz, and that...
  3. hevans1944

    CASIO Keyboard Power

    It is extremely important that you find the right-sized barrel-plug for the external power supply. "Close enough" is not good enough. It must be exactly the right size, and fit snugly in the receptacle without side-to-side "play" and without falling out. Loosely fitting plugs are an invitation...
  4. hevans1944

    Replace MOSFET AO4433 With FDS6679

    Well, hopefully you have some interest in becoming a DIY electronics kind of person. That is what this forum is for. Read the "About Us" statement at the bottom of every page: Electronics Point is a community for members to discuss, advise and debate electronics related topics. It's really hard...
  5. hevans1944

    Replace MOSFET AO4433 With FDS6679

    Do you even know what that statement means? This is a direct quote from a response to the same question here that you also cross-posted to Electronics Stack Exchange. We here at Electronics Point are now waiting with bated breath for your next post on www.edaboard.com, where you stated that you...
  6. hevans1944

    CASIO Keyboard Power

    Well, lucky you. It does appear, from reading the schematics in the service manual, that there are protection diodes to prevent damage from applying an external power supply with reversed polarity. Why have you not installed six D-size cells to test functionality before attempting to "brick"...
  7. hevans1944

    Reliable thermometer with humidity

    Go to this link and purchase the Arduino Weather Board.
  8. hevans1944

    Transistor switch suitable to run dc motor?

    The IRF630 has a lot more current capacity than the smaller 2N7000. The Rds(on) resistance is probably smaller too, meaning less power dissipation in the transistor for any given drain current. If you can find, and can afford to buy, the IRF630 please do that instead of using the 2N7000. In...
  9. hevans1944

    Servo motor used with adruino need no driver?

    Google is your best friend to find help on this. Visit this Google results page. In general, yes, you do need a servo motor driver or "shield" for your Arduino. You may have stepped off into the deep end of the swimming pool on this one. You have a lot of studying and research to do before you...
  10. hevans1944

    Transistor switch suitable to run dc motor?

    That's the first thing I would try to do. Always a good idea to place a diode across the motor armature connection unless you are going to reverse the polarity. You also need to use a "logic level" MOSFET that will turn on fully with just a few volts on its gate. You may need to precede the...
  11. hevans1944

    Electronic circuits work in mysterious ways?

    "Things mechanical" can be extremely complicated and difficult to visualize "how they work." And without a background mathematical foundation in mechanics, including strength of materials, new designs economically produced are virtually impossible. In recent years, 3D modeling software has aided...
  12. hevans1944

    4-20mA Current loop transmitter for RPM Measurement

    I am going to go way out on a limb here and guess that the "Transmitter for RPM Measurement" actually produces pulses in the range of 0.0005 Hz to 50 kHz. With a 250 Ω resistor in the 4 mA to 20 mA current loop, a 4 mA state would produce 1 V and a 20 mA state would produce 5 V. Thus the signal...
  13. hevans1944

    Help with strobes!

    "No need for 2 button?" Did you actually read the OP's requirements? It looks to me like the OP wants at least two buttons, Left and Right, to act as turn signals when the lights aren't doing their fancy flash dance. Of what use to the OP is the forum section on microcontrollers, if the OP...
  14. hevans1944

    Help with strobes!

    Yeah, but complicated by the fact that the OP wants their dongle to also function as normal brake turn-signal lights when the R or L (push-button?) switch is pushed: We have to assume there is some, as yet undefined, method to cancel the turn signal function and perhaps begin the strobe...
  15. hevans1944

    Help with strobes!

    That's for you to determine, based on your requirements. This is a self-help forum, meaning we help those who help themselves. You said: So, it is your job to define your requirements that fit your needs and begin the project. We will help, but there is no longer a living member here who will...
  16. hevans1944

    2018 Science Olympiad Hovercraft Help Needed

    It's too bad that you found Electronics Point this late for the 2018 Science Olympiad competition, but given that it appears your school and team made it to the 34th Annual Science Olympiad National Tournament, to be hosted on May 18-19, 2018, by Colorado State University in Ft. Collins...
  17. hevans1944

    2018 Science Olympiad Hovercraft Help Needed

    I have suggested that the Moderators of this forum create a new thread to address the 2018 Science Olympiad Hovercraft event. Time is of the essence on this as the final competition in Colorado nears. Responders should go to the Science Olympiad website and download the latest rules for the 2018...
  18. hevans1944

    Relay Assistance

    Yes, that relay would be okay if ordered with a 24 V DC coil, but you don't need the relay because your 24 V DC-to-12 V DC "bucking" power supply is connected directly to the output of your 24 V DC "project" power supply. When the "project" supply is ON, 12 V DC will be available from the...
  19. hevans1944

    Relay Assistance

    There is no such thing as a "step down transformer" that works with DC. You can purchase a "buck converter" that will accept 24 V DC as input and produce 12 V DC as output. LEDs can be powered from any DC voltage source that provides a greater voltage than the forward voltage drop across the...
  20. hevans1944

    PirSensor

    PIR (Passive Infra Red) sensors are actually two pyroelectric IR sensors mounted side-by-side with two slightly different fields of view provided (usually) by Fresnel lens arrays. The sensors are connected so their signals subtract. That means any change in sensor signal caused by heating from...
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