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  1. KJ6EAD

    How to added up a Resistor Value using misc values

    He's choosing values from the E96 series to make an E48 value in one case and an E96 value in the other. Since this is clearly an academic exercise, his choice for the first value may be random or he may be working from a selected subset of values that's not known to us. As previously stated...
  2. KJ6EAD

    How to added up a Resistor Value using misc values

    I edited a typo in the last paragraph of post #5.
  3. KJ6EAD

    How to added up a Resistor Value using misc values

    Using E24 values to get 1.87k, 3.6k paralleled with 3.9k = 1.872k, a 0.107 % error but as I said previously, there are no exact matches in parallel, only in series.
  4. KJ6EAD

    How to added up a Resistor Value using misc values

    I gave you all the information you'll ever need on this subject in posts #3 and #5. Do you know what resistance is formed by two 500Ω resistors in series? How about two 2k resistors in parallel?
  5. KJ6EAD

    How to added up a Resistor Value using misc values

    I use this calculator. It allows you to enter the desired value, define which E series to work from and displays all matches and near misses in both series and parallel combinations. http://www.qsl.net/in3otd/parallr.html By the way, 1.78k and 1.87k are standard E48 values; 1.91k and 1.74k are...
  6. KJ6EAD

    How to added up a Resistor Value using misc values

    Some problem definition is missing. What resistor values are you allowed to use and how many resistors in combination? It helps to have a good familiarity with the standard E12, E24, etc. series values. http://www.logwell.com/tech/components/resistor_values.html Rules of thumb: *Use as few...
  7. KJ6EAD

    Replacing thermal fuse with something that will reset

    The thermostat you found has hysteresis as you noticed. It's either on or off when the temperature is in the region between the two switch points. It isn't an appropriate solution for your blender. This is the type of resettable thermal switch I'd expect to find in that type of product. Once...
  8. KJ6EAD

    Running an LED off a 120v wall outlet

    If you leave the thing on all day and night for the next 11 years, half of the LEDs may fail and all will be dimmer than when they were new. :) This is why you rarely see an LED socketed.
  9. KJ6EAD

    Running an LED off a 120v wall outlet

    Does it have a brand name and model #?
  10. KJ6EAD

    Running an LED off a 120v wall outlet

    Does this "special" bulb have a number on it like 222?
  11. KJ6EAD

    Newby Electronics Question....

    Ceramic PCB substrate (Alumina Al₂O₃) has a specific resistivity around 1PΩ/cm. That's 5 orders of magnitude higher than your 10GΩ resistor. FR4 is around 5TΩ/cm.
  12. KJ6EAD

    Running an LED off a 120v wall outlet

    If the existing lighting system has housings, mounting and optics that are good such as a ring light, it would be best to retain them and just build an LED light source to fit.
  13. KJ6EAD

    What kind of plug is this?

    See type 163 in the following: http://www.cs.ubc.ca/~hilpert/e/powerConn/index.html
  14. KJ6EAD

    Cooling LEDs with big chunk of aluminium?

    Not necessarily, but the cooling problem is significantly worsened. In general, you will need a much larger heat sink with more emphasis on the heat pipe (thick transport medium) to move heat away from the LED than on fin area. You might need to use a copper heat sink and the air volume in the...
  15. KJ6EAD

    Who makes this part, please?

    Front-End Module. http://en.m.wikipedia.org/wiki/RF_front_end
  16. KJ6EAD

    Blown capacitors in PC

    It looks good to me at least electrically. I didn't check the dimensions.
  17. KJ6EAD

    MAKE: Electronics Ex. 10 Help Needed

    I had no idea there was a video. Where's the play arrow? :o
  18. KJ6EAD

    MAKE: Electronics Ex. 10 Help Needed

    I'll take your word for it. The picture is both out of focus and speed blurred. I'm glad it finally works.
  19. KJ6EAD

    Replace Switch on circuit board question

    Just set the voltage to 12. The circuit will take whatever current it needs. The rating on the supply is irrelevant as long as it's high enough, which it is.
  20. KJ6EAD

    18 AWG multi conductor flat wire by the foot?

    I've used this one. http://parts.digikey.com/1/parts/392052-tool-crimp-14-24awg-universal-63811-1000.html
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