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  1. BobK

    Hello, can somebody help wich transistor is like bfg520

    Well, look at the specs of the BFG520 then at the BFG transistors you have access to. Pick one that is close. Bob
  2. BobK

    Hello, can somebody help wich transistor is like bfg520

    Well, why don't you tell us what RF transistors are available in multisym, then? Bob
  3. BobK

    Hello, can somebody help wich transistor is like bfg520

    For 100MHz you could try a BF199, which is a common one. Bob
  4. BobK

    Modify chinese high power LED to emit less light/heat?

    Well, the 3W one will put out less light and heat than the 9W one. Bob
  5. BobK

    How to make my thermocol incubator marketable?

    I dont understand your problem. Practically everyone who sells a product uses parts manufactured by others. Why do think you cannot sell your incubator because you used insulating material nade by someone else? Bob
  6. BobK

    Inductor coil question

    Hop, By my calculation it takes 23.34 turns to get 25 uH. The inductance is proportional to the square of the number of turns, so we get: 47 / 25 = 32^2 / n^2 n^2 = 32^2 * 25 / 47 = 544.7 n = sqrt(544.7) = 23.34 Bob
  7. BobK

    LM2596

    Yes, the Ipad likely requires different voltages on the data lines. Bob
  8. BobK

    Short

    And what are you seeing that is different from that? Bob
  9. BobK

    Basic understanding of low pass filter

    My explanation was in the time domain because that is what you wanted to see. The time domain equation for a capacitor is a differential equation which applies universally. When solved for a sinusoidal input, you get the frequency domain equation, which is no longer a differential equation...
  10. BobK

    Short

    What do you expect to happen when you connect a resistor between +45V and ground? Bob
  11. BobK

    Solar Tracker

    Have you ever noticed that all of the solar farms popping up everywhere use fixed panels? Ever wonder why? It is because using what you would spend on tracking to buy more panels will increase the output more than the tracking system will. Bob
  12. BobK

    Basic understanding of low pass filter

    Yes, for the low pass. Read my post again, I said that explcitly. For the high pass filter, the output is the input minus the voltage on the capacitor, which is also the voltage across the resistor. Bob
  13. BobK

    Basic understanding of low pass filter

    messy, Referring to LvW's post, you are trying to understand the operation of the filter in the time domain. It is possible to make sense of it that way, but more difficult than using the frequency domain. A capacitor charging through a resistor has a time constant RC (the product of the...
  14. BobK

    HA13150A Audio Amplifier

    Did you read Steve's post, #4? Bob
  15. BobK

    Replacement transformer

    You need to know the output voltage(s) and current(s). Bob
  16. BobK

    Inductor coil question

    The 27uH will be fine. The thicker wire makes it almost certain that it has higher current carrying capacity, which would be the only worry in a replacement, so you are covered there. Bob
  17. BobK

    Peak detector for piezo drum pad

    You need to have some hold because you cannot otherwise guarantee that you will see the max. You have 22 sensors to sample, and you cannot be sampling all of them at the same time. If you hold the peak for a little more than the time between scans of the same sensor, you will catch the peak...
  18. BobK

    Oscilloscope Question

    The probe should have a ground clip attached to it. If not, it is missing. Bob
  19. BobK

    Simple LCD - help needed plz

    LCDs found in mass market products are usually custom. If that is the case, ypu will mot find a replacement. Bob
  20. BobK

    Peak detector for piezo drum pad

    No. Try MCP6001 Bob
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