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  1. ratstar

    short circuit detector

    yes. sneaky business! =) u guys are an enigma to me.
  2. ratstar

    short circuit detector

    So u think it isnt true?
  3. ratstar

    Please help me build a truly silent mouse.

    Yep Harolds right, even with an electrostatic touch switch, if you tap too hard with your finger... tappy... tappy tap tappy getting angry.
  4. ratstar

    short circuit detector

    If I count my blessings (albiet in an unavoidable circumstance.), I guess so. Im just letting you guys know that a voltage divider is enough to detect short circuits. isnt that clever.
  5. ratstar

    short circuit detector

    Why? it cant be because it doesnt work, because it does. Is it because its so easy everyone already knows? Have a look at this circuit on the internet-> (these guys dont know...) https://www.instructables.com/Short-Circuit-Detector-Part-1/ Its overcomplicated, and I doubt it even works...
  6. ratstar

    short circuit detector

    The second resistor, makes it a voltage divider, so only half the power of the battery hits the led. it should be safe. but i spose, I could be wrong... The fact that the invention actually works is not as important as the led frying with the wrong resistance, is it. U guys help keep my...
  7. ratstar

    Experiment with NPN transistor BC547

    if you have 2 isolated positives, (must go with) 2 isolated negatives. the current will add up on the lines, and they only short circuit within themselves. To get an isolated pos+neg, you need a capacitor, a battery, or a transformer. 1 isolation, will only ever attract to itself, and 2...
  8. ratstar

    short circuit detector

    but its 4.5 volts cause its in a voltage divider, and you can light an led off a battery with no resistor fine, with the volt reduction I think would be about safe.
  9. ratstar

    Experiment with NPN transistor BC547

    One more thing to add, if you dont put a resistor with the potentiometre, youll actually steal all the current from the collector as well, because itll short to the base. And it definitely seems like a situation where the transistor would be fried. But if the 2 5v entry points, where...
  10. ratstar

    short circuit detector

    I think a 9v battery will do. I can see u understand the circuit, because of what you said.
  11. ratstar

    Small Project Advice

    adding the love blinky! then shell know you can make ur own transmitters once u proove it to her right, get the other guy to nod. girls can tell if your doing better than the other tech guy over the room. let me tell you.
  12. ratstar

    short circuit detector

    got another one for u dudes to gawk at the insane simplicity. =) I replaced the picture for a better one, more descriptive and in voltage divider mode instead of current divider to save overloading the led.
  13. ratstar

    Making the connection

    if its not permanent, and your testing stuff out, I just twist em together. and i strip em with my beaver toof.
  14. ratstar

    Transistor AND gate question

    you want the emitter going to the collector not the base. the base is where the variables go. good luck with ur adder. :)
  15. ratstar

    Current Direction

    Mj812, i cant see your pictures. but they are excellent for you to figure it out. its not that hard, get off the virtual simulations and test things for real, the simulations on the net are flawed. if you play with resistors and wires and more than 1 battery at once youll discover->...
  16. ratstar

    DC-DC converter design

    If you output to the capacitor from the voltage divider, then you make another loop from the capacitor, thatll be like a voltage follower, the circuits load wouldnt affect the functioning of the voltage divider. I actually dont know for sure, I should try these things out before I post em. :)
  17. ratstar

    DC-DC converter design

    If you use large resistances for the voltage divider, wouldnt it handle more load on the output loop? but is there a disadvantage in doing that? Also, what if you went to a capacitor after the voltage divider, then added the load to the discharge of the capacitor instead of using the line...
  18. ratstar

    Powering 0402 smd LEDs

    Yes.. sorry I think im being a bit confused..
  19. ratstar

    Powering 0402 smd LEDs

    So are they voltage controlled or current controlled colours? then i can draw you up a circuit if you want. :) (is that right? or am i not understanding) It takes alot of practice tho to understand resistors, I dont mean that its easy for a beginner, I bet even pro's actually stuff it up...
  20. ratstar

    Powering 0402 smd LEDs

    Im good at doing this, voltage division and current division is my middle name. :)
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