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  1. Arouse1973

    Anyone know what type of resistor this is?

    I am guessing it is a 2W resistor, you could measure its size and see if you can find something close. See link to RS for a guide. You might find them on eBay or Amazon if you don't want to setup an RS account. You can go lower than 250 ppm if you want to, it won't matter. Depends what's out...
  2. Arouse1973

    Electrolytic or Tantalum ?

    You don't have to use a polarized capacitors so at the end of the day it's up to you. Have a look a the characteristics of both MLCC and electrolytic, see which one is best suited to your design. Thanks Adam
  3. Arouse1973

    Anyone know what type of resistor this is?

    Yep you are right. Five band then. Cheers Adam
  4. Arouse1973

    Anyone know what type of resistor this is?

    It's a strange one, I have not seen a ppm marking on a 5 band resistor before, it's normally on 6 bands. Unless it is 6 bands and the burnt mark is hiding the 6th band? That means it will be a different value to what I first said. Thanks Adam
  5. Arouse1973

    Anyone know what type of resistor this is?

    20 Ohm 250ppm, possibly wire wound but difficult to tell from the picture. Adam
  6. Arouse1973

    Electrolytic or Tantalum ?

    Hello. I rarely use electrolytic capacitors now, I prefer MLCCs . I won't use Tants out of principle because of where Tantalum is predominantly mined. I guess if I had to choose between the two it would have to be electrolytic type. Thanks Adam
  7. Arouse1973

    Help with strobes!

    Oh no another 555 timer fan lol :) Adam
  8. Arouse1973

    Checking PIC18F4520 Timer 0 overflow

    You need to comment your code so we know what you think the code should do. You need to do this with all your code.
  9. Arouse1973

    MPPT charge control Project - LT3652

    The charger IC checks to see if the battery voltage is within limits to begin charging at full current. You don't have a battery so it's probably this that is causing the issue. The IC will only give you 15% of the programmed current if it senses a low battery voltage, which is about what you...
  10. Arouse1973

    Capacitor charging itself?

    Apologies Duke, I misread your post. Regards Adam
  11. Arouse1973

    Capacitor charging itself?

    Electric field stored in the dielectric. Please explain more?
  12. Arouse1973

    No power

    And what is your question?
  13. Arouse1973

    PT4115E LED Driver Efficency

    Hi Fish. To compare results from earlier testing it would be better if the designs matched. You really do need to take into account what I mentioned earlier about the switching current. Because there is a portion of the measured input current which will be closer to zero when switching and I...
  14. Arouse1973

    PT4115E LED Driver Efficency

    Hi Fish If you tested the original one in the same way and got different results then there must be something wrong with the current design. Building another unit is the next step I agree. Thanks Adam
  15. Arouse1973

    PT4115E LED Driver Efficency

    Hi Fish. If you look at the data sheet it shows the efficiency going down as the supply voltage is increased. But it should still be above 75%. Have you tried it with the 10 uF capacitor removed? Also where and how are you measuring your current for the input and output values? Remember the...
  16. Arouse1973

    Capacitor rated voltage question.

    Hi Dave. Here is some information for you. https://www.niccomp.com/resource/files/ceramic/VoltageCoefficientofCapacitors-032012-R1.pdf Thanks Adam
  17. Arouse1973

    Capacitor rated voltage question.

    Yes it will. Some capacitors have what's called voltage coefficient which means their value changes with applied voltage but that is normally ceramics. That is a ceramic capacitor will have its rated capacitance at its rated voltage. Thanks Adam
  18. Arouse1973

    PT4115E LED Driver Efficency

    Hi Fish, do you have the datasheet for the PT4115E? Cheers Adam
  19. Arouse1973

    Hi everyone

    Hello Gavcorr, welcome to EP Adam
  20. Arouse1973

    Understanding basic passive components: resistors, capacitors, inductors.

    I think this will be a great resource. If you need any help, let me know. I don't mind helping to put some information together. Cheers Adam
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