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  1. (*steve*)

    Hello All

    Welcome Rajeev
  2. (*steve*)

    Converting 110v Trafo To 220v Version

    I'm not sure I'd even bother unless it was on separate bobbins.
  3. (*steve*)

    What are an engineer's most common concerns when selecting instrumentation?

    Well, as a manufacturer you need to do the bulk of the marketing. What retail business will want to stock your stuff if they don't know about them and there is no demand? And who will buy them if they don't know who you are or what makes your product worth investigating? Let's say your...
  4. (*steve*)

    Waterproofing A Remote Control

    One option would be to get him to fill his jacuzzi with isopropyl alcohol. A less flammable option might be carbon tetrafluoride or even freon. Sealing is not really easy, especially if you want to be able to replace the batteries. One option would be to use sealed switches and wireless...
  5. (*steve*)

    Converting 110v Trafo To 220v Version

    Yeah that's the point of rewinding the primary to make the 110V transformer work with 220V.
  6. (*steve*)

    Low Cost MRI Machine

    Should just be able to order some of those magnets cheap from China, right?
  7. (*steve*)

    Converting 110v Trafo To 220v Version

    I understand you're getting the equivalent of 21 feet of snow today. Except it's all rain. What do you mean by "changing the secondary output"?
  8. (*steve*)

    Converting 110v Trafo To 220v Version

    If you were to rewind the primary you should count the turns as you remove the existing primary and replace it with one having twice the number of turns. Use the same wire gauge (if it will fit). If you need to use a smaller gauge, ensure it is no smaller than half the cross-sectional area...
  9. (*steve*)

    Battery check circuit with power save for Feather Huzzah and ESP8266?

    Use a MOSFET to connect/disconnect the upper resistor on he voltage divider. You will probably need a bjt to control the gate of the p channel MOSFET. This will draw no current until you want to take a reading.
  10. (*steve*)

    LED garden lights malfunctioning

    You obviously live in a place that doesn't see the sun too often. The batteries die very quickly in environments where there is lots of bright sun for many hours on end...
  11. (*steve*)

    Questions conservation electronic

    See here.
  12. (*steve*)

    I fried a card reader

    And the correct replacement parts. This may be the largest stumbling block (identification, availability, and price).
  13. (*steve*)

    Low Cost MRI Machine

    Well, if you can find a way to replace the superconducting electromagnet with something smaller and cheaper, go for it. You apparently need a magnetic field of between 0.5 and 2 Tesla (5000 to 20,000 Gauss).
  14. (*steve*)

    Questions conservation electronic

    It is acceptable as long as you take precautions. É aceitável, desde que você tome precauções.
  15. (*steve*)

    Introduction

    Hi Clive. Welcome to Electronics Point. Can I send you some paragraph breaks ;-)
  16. (*steve*)

    Converting 110v Trafo To 220v Version

    You could get a suitably sized 220 to 110V isolating transformer (expensive) or autotransformer (much cheaper) Note that many isolating transformers don't pass the earth through, which you want to do in this case. Autotransformers can be potentially dangerous where plugs are such that you can...
  17. (*steve*)

    DT 9205A Help

    I think you probably killed it.
  18. (*steve*)

    Questions conservation electronic

    As long as nothing can short out any of the exposed metal contacts, it's OK. Clip off the exposed wire ends of the leads as these represent probably the greatest threat of shorting to each other or to another terminal. Contanto que nada possa curto nenhum dos contatos metálicos expostos, é...
  19. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    And since you know (roughly) what Vbe is (and that's NOT the voltage between the "base" and emitter terminals of this device, because you don't have access the the base directly), when Vce is less than this, the collector junction is forward biased. These devices are not intended for analog...
  20. (*steve*)

    What are an engineer's most common concerns when selecting instrumentation?

    Some of my first questions are: Can I trust the specs Is it well designed and reasonably free of bugs Will it do the job correctly and safely
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