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  1. (*steve*)

    MIC4609 Mosfet Driver Current spike on Enable

    Never say never. I'm working on a project which employs a similar driver. I have noted warnings on several chips I considered and rejected concerning the exact power up sequence. Also an open source driver manufacturer warns of strange behaviour that can destroy things if you are tempted to...
  2. (*steve*)

    MIC4609 Mosfet Driver Current spike on Enable

    By my calculations, an average of 20A for 0.2ms equates to 4000μF. Other possible causes could be: Shoot through when the device is enabled (try disconnecting the mosfet gates Incorrect calculation of voltage drop to current (what are the raw values?). Have you confirmed with a known load...
  3. (*steve*)

    Circuit not charging when the battery is below a certain voltage

    Lithium cells can be damaged if you discharge then too far. Too far is something less than 2.8 to 3.0 volts. Chargers frequently refuse to charge over-discharged cells See my thread "playing with fire" for my own recent experience.
  4. (*steve*)

    Hi I’m Justin

    Oh I made so many basic electronics mistakes when I was your age. I hope you have as much fun learning as I did. It should be a lot easier with this new fangled internet thingy. Don't be afraid to ask silly questions. We've all been there.
  5. (*steve*)

    MIC4609 Mosfet Driver Current spike on Enable

    Where and how are you measuring that current? Your images are a bit small to allow me to read them.
  6. (*steve*)

    Playing with fire

    When I consider the cost of that drill compared to even one piece of test equipment in my shed...
  7. (*steve*)

    DSO138 oscilloscope problem

    Are you sure the polarity of your plugpack is correct?
  8. (*steve*)

    Playing with fire

    Lithium cells when overcharged produce lithium dendrites which short the cell. When heavily discharged (I've read 12% reverse charged) you get copper dendrites which short the cell. The 5.5V was the input to the inbuilt charger (it is rated for 6V). There is a linear regulator in there as...
  9. (*steve*)

    15W Laser Diode

    He keeps posting on my profile, ignoring my requests he posts here. I don't generally answer questions posted on my profile.
  10. (*steve*)

    Playing with fire

    No explosions during the night. Now I'm carrying around this screwdriver like it's a pipebomb :-o Let's see how it goes...
  11. (*steve*)

    Playing with fire

    A week or so (it seems, it may have been a month) I checked one of my el cheapo electric screwdrivers and it was telling me the battery was VERY low. Having misplaced the charger, I've been promising myself to either find it or if something up. Today it wasn't reading a charge at all. Worse...
  12. (*steve*)

    LCD screen to wide ribbonImage control PCB

    I'm really uncertain what you're asking. But if you're asking what a thin flat flexible PCB is called, then the answer is "flat flex PCB", or "Flat Flex Circuit", or "Flat Flex Cable".
  13. (*steve*)

    Spark gap transmitter

    It will still be illegal with an amateur radio licence, however, if you are able to get a licence you will be better equipped to know what is legal and how to operate a transmitter.
  14. (*steve*)

    Electrotechnic exercise (help)

    And hence the rules about not giving answers. It seems you've just been fooled into doing this person's homework. This sort of thing makes me want to identify the school the person attends and give them a heads-up about unethical student behaviour.
  15. (*steve*)

    Spark gap transmitter

    If you are really interested in building a transmitter, why not investigate getting an amateur radio licence?
  16. (*steve*)

    Spark gap transmitter

    Firstly, the battery probably needs to be several thousand volts. Secondly, once you get this working you are likely to get a knock on the door from your country's spectrum regulators. And they are not going to have smiles on their faces.
  17. (*steve*)

    Want to copy ultrasound tooth regeneration device.

    Bump. Reopened. The moderators have discussed this and have decided to reopen the thread. We have the concern that the linked ultrasonic device would be something we wouldn't put in our mouths because of the shock hazard.
  18. (*steve*)

    DMM allows current to pass but measures 0 mA

    Hmmmm. I hope it keeps working.
  19. (*steve*)

    Building a multimeter vs. cannibalizing one?

    Probably the cheapest and easiest option is #3, buy a module that does what you want. What is it that you want?
  20. (*steve*)

    Insufficient Power on my Load

    As mentioned previously the emitter and collector of Q3 are drawn back to front Once you fix that you will need a resistor in series with the base of Q3 or it will likely expire the first time you use the circuit.
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