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  1. (*steve*)

    10v -14v input to 12v regulator circuit high current

    To answer the question as posed, and without considering other aspects... You could use an inverting regulator which could create -12V from a positive voltage from 10V to 14V. Another alternative is a boost regulator followed by a buck regulator. The first converts there input voltage to...
  2. (*steve*)

    Is a motor also a dynamo?

    The output should be pulsed DC. And I hope you are using a series resistor when you connect the led to a 9V battery.
  3. (*steve*)

    Is a motor also a dynamo?

    You say you had back to back diodes, I presume you mean LEDs? Did you mean they were in inverse parallel, or wired be back to back in series? You want the former, the latter won't work. Damage to LEDs can be non obvious. A damaged LED may be slow to turn on our require a higher than normal...
  4. (*steve*)

    Is a motor also a dynamo?

    I could hardly tell anything from the video, other than you sound like a sandgroper. It is possible that you rotated the motor the wrong way and damaged the LED, the motor produced insufficient voltage to light the LED, the LED is infra-red and you couldn't see it light up, or the motor doesn't...
  5. (*steve*)

    Kenwood oscilloscopes?

    If it wasn't for the horrendous shipping, I would have bought it.
  6. (*steve*)

    Kenwood oscilloscopes?

    If anyone is interested, this looks to be a good buy
  7. (*steve*)

    Figured I'd say hi

    We have a special section for that :) It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears, and the summit of his knowledge. This is the dimension of...
  8. (*steve*)

    Water Damage on Keurig 2.0 Plus

    what is a keurig and is it supposed to get wet or hold water?
  9. (*steve*)

    Wanted: Desperately seeking old caps

    It's hard to know if a lower voltage rated capacitor would be acceptable. However a higher voltage and/or a slightly higher capacitance (say 10,000uF) should be fine.
  10. (*steve*)

    Wanted: Desperately seeking old caps

    Why? Do you want something that looks original? If you've removed a bad part, there is the option of opening it up, emptying it out and placing a modern part inside. Another option is to leave there faulty part in place and put a modern part (which is likely much smaller) in an inconspicuous...
  11. (*steve*)

    Buck converters

    Ok, well you're (at the very least) going to need multiple switching elements and you're going to have to ensure they turn off together. Oddly enough, it would be easier to start with a higher voltage and use a mosfet to switch the current going into a transformer. That way you will be...
  12. (*steve*)

    Buck converters

    It depends on what you want to do with it. Switch mode regulators are not suited to some uses. Have you ever built a power supply before? What is your skill with electronics?
  13. (*steve*)

    Buck converters

    You will need a great deal of skill to create a buck regulators capable of that current. There is no particular reason why it can't be done, but anyone can ride a push-bike at 15 km/h, it takes a lot more skill to ride one at 150km/h. Same thing with electronics at high power levels. Why do...
  14. (*steve*)

    The Best and Cheapest way to clean Rosin Flux for your Board.

    This is what I have: It's essentially ethanol, detergent, and water. Apparently it's not toxic, but I've not tried it in a cocktail. I find it cleans a lot better than isopropyl alcohol. Also it was a lot cheaper than IPA when I got it. I think I got mine when they did some sort of...
  15. (*steve*)

    Kenwood oscilloscopes?

    I think I may have seen that same web site. I'm after a personal recommendation. :-)
  16. (*steve*)

    Kenwood oscilloscopes?

    I've not owned or used a Kenwood oscilloscope. Does anyone have anything to say about their build quality or failure rate in their old age? Or maybe experience in their repair... are they made of unobtainium? "Kenwood" was the name of a very cheap "hi-fi" brand here, and I've consequently...
  17. (*steve*)

    The Best and Cheapest way to clean Rosin Flux for your Board.

    If I remember I'll look up what is in the stuff I use. It works really well (far better than isopropyl alcohol in my experience). I really only have it because it was available really cheap when I first got it -- although I'm sold on it now. What is it? It's the blue stuff in the plastic...
  18. (*steve*)

    The Best and Cheapest way to clean Rosin Flux for your Board.

    Good to know. I'm already concerned about things like those surface mount LEDs with the soft lenses. Funny you mention polystyrene... Polystyrene caps are affected by alcohol and heat. Obviously not something you surface mount, but occasionally used where you need to clean the flux to...
  19. (*steve*)

    The Best and Cheapest way to clean Rosin Flux for your Board.

    The obvious question is whether this stuff can damage LEDs, or other sensitive components. If it evaporates, what does it leave behind? Is it either conductive, or will it leave an insulating film (neither is great). If it is at all corrosive (and anything water-based can easily become...
  20. (*steve*)

    Woo-Woo Biocompatible Frequencies

    And I would add to that a suggestion you talk to Mr. & Mrs. Schumer. They have been generating little Schumers for some time. I don't think there's anything particularly special. Other than their name, most people can do it, and anyone can try.
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