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  1. (*steve*)

    Over-voltage protection for op amp

    That's why you have the resistor as well (or even 2 resistors, one before the zener to limit zener current, and one after to limit input current).
  2. (*steve*)

    Latop Chip Level Repair

    Bro, you need to tell us about the problem so we can find you something specific (probably by googling it for you) or offer suggestions of our own as to how to fix the specific problem. First thing for you to Google is "Lenovo B490 teardown" and similar things to find information on how to open...
  3. (*steve*)

    Latop Chip Level Repair

    It's right next to the tutorial on "understanding your spouse". What you're asking for is so wide in scope that any tutorial is likely to be either so general or so specific that it is useless.
  4. (*steve*)

    Motor speed help

    Please post your homework in the homework section.
  5. (*steve*)

    P channel mosfet

    The voltage you apply to the gate of the MOSFET is relative to the source terminal. There is no connection shown on your circuit been your gate voltage part of the circuit and the source terminal of either mosfet. I guess it's possible that your 12V Vcc and the sources son1 and son2 could...
  6. (*steve*)

    LED Lighting Help

    Consider yourself corrected.
  7. (*steve*)

    Audio Generator vs. Signal Generator...

    I can't see why not.
  8. (*steve*)

    Does anyone know of a simple circuit to establish an upper limit for a high load variable supply?

    The simple solution is to place a zener diode from the MOSFETs drain to it's gate. If the drain voltage gets too high this will turn the MOSFET on. You need to be careful that this gate voltage doesn't interfere with your gate driver. Typically all you need is judiciously placed resistors.
  9. (*steve*)

    Audio Generator vs. Signal Generator...

    In a simplistic way, an "audio generator" is a signal generator that is limited to frequencies I'm the audible range. Most signal generators have a frequency range that is much wider.
  10. (*steve*)

    Questions conservation electronic

    You can also dry out the silica gel by gently heating it. The combination of silica gel and a cheap heat sealer would probably work wonders.
  11. (*steve*)

    am outta here

    See ya Donkey. Are you moving to some small tropical island off the coast without internet?
  12. (*steve*)

    HOW TO ID-- A 12 VOLT ZENER DIODE --ONE WATT --

    I didn't see either of these comments. With the exception of @Audioguru and @hevans1944 (both of whom you have thanked for their contribution), and one other very short post, I'm the only other contributor to this thread that I could see. And I'm sure I didn't make either of those comments.
  13. (*steve*)

    Help with antenna phantom power

    246MHz is awfully close to your highest operating frequency.
  14. (*steve*)

    Backfeeding with a generator

    Wait until you get the switch to do it properly and get an appropriately qualified person to wire it in.
  15. (*steve*)

    Will I get any current?

    I wouldn't try to reinvent the wheel. Google for "diy permanent magnet alternator".
  16. (*steve*)

    Timed Arduino, Solar Panel, Battery & 12V Pump HELP

    The battery drain from the Arduino will likely be higher than that for the motor. Remember to include it in your calculations. We have recently had a few threads about simple charge controllers for lipo batteries. Check them out...
  17. (*steve*)

    Latop Chip Level Repair

    Some repairs are almost trivially easy. Others can be practically impossible. What do you need to repair? Do you have photos?
  18. (*steve*)

    Motor speed help

    Motors are a type of load that is not easily controlled by a potentiometer. They require higher currents to start than the do to continue rotating. A resistor will limit this peak current far more than the operating current. This means that you may have trouble starting the motor. In...
  19. (*steve*)

    Will I get any current?

    A lot depends on the way the magnet is magnetised. For example, it might have one face with one polarity and the other face the other polarity, or the inside could be a different polarity to the outside, or there may be alternating poles in either of the above. These options are not exclusive...
  20. (*steve*)

    Looking for info on Trackpoints

    I think you're taking about those odd little button things that were placed between keys on laptops and used as joysticks. I don't have any information on them other than thinking these were originally on IBM laptops.
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