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  1. C

    Time Lag Fuse Blowing

    Get yourself a box (1,000) of glass fuses with a fine wire and dob of solder in the middle. I don't think you can get 160mA versions but maybe 200mA or 250mA. Watch the fuse as you turn on the supply after it has been off for 1 hour.. If the wire "dips"you know you have a surge that is lasting...
  2. C

    Charging a 450v 6800uF DC capacitor

    Charge it via a 10k resistor and wait for 30 minutes.
  3. C

    Creating a latch circuit with logic gates

    There is a 9 button combination lock on the web. You need to have a lot of skill to design this type of circuit.
  4. C

    Building an Audio Amplifier

    You can buy a 3w amp for $5.00 post free on ebay
  5. C

    OA79

    On eBay 99 cents for 10 post free. It's a Ge diode.
  6. C

    US based PCB manufacturer

    "the problem is for us as customers we have no idea who are the good reliable ones and who are the bad ones " We have just told you who are cheap and reliable. From my website: Here is a website that compares the cost of making a PCB from different manufacturers: http://pcbshopper.com/ Many...
  7. C

    ESR meters show different values

    Buy a third meter.
  8. C

    Rest in Peace, Kris

    This is exactly the reason why you should never make enemies or argue with your loved ones. You never know when a departure will occur. And it always happens to be the best. Couldn't be a nicer person. And we will never know why.
  9. C

    please help!

    You need a 12v version of the 2v motor.
  10. C

    Anyone recommend me a book?

    "Who is it doing the corrections to this document?" About 20 different contributors are all supplying material. Look, the situation is this. If an author makes one single mistake, it can be overlooked. But if he makes two mistakes, the book should be canned. A well-known writer for Electronics...
  11. C

    Anyone recommend me a book?

    The latest revision of the Errata is now available: https://onedrive.live.com/redir?resid=967A90CA47FD025B!172&authkey=!ACEbpvA4f9gUlxc&ithint=file%2c.pdf The above is about 120MB so wait 15 minutes for it to download. There are hundreds more mistakes in further chapters and you can email...
  12. C

    Anyone recommend me a book?

    This is only 180KB: http://www.eg.bucknell.edu/physics/ph235/errata.pdf The full version is 120MB !!!!!!!!!
  13. C

    IDENTIFY Transistor from its Hfe Value

    Just as I said. One has a gain of 50 and the other 1,000 an yet they both work ok. The gain is rarely important.
  14. C

    IDENTIFY Transistor from its Hfe Value

    Use any transistor. The gain of the transistor is not important in you case if the current is small.
  15. C

    Anyone recommend me a book?

    Practical Electronic for investors is filled with mistakes. I would not read it.
  16. C

    LM386 replacement

    You wont find any difference.
  17. C

    Newbie question about 12Vdc fan

    A ball-race is best. It must have the same number of wires or 2-wires will work with all arrangements.
  18. C

    question about ohm's law

    then the resistance should change to smaller value should be then the resistance should change to higher value
  19. C

    Light Bulb

    Firstly you need to get an old CFL and remove the 3003 transistor.
  20. C

    Variable votage regulator

    Just use the negative regulator in the negative line:
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