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  1. I

    0-30 Vdc Stabilized Power Supply

    Yes it would. Will the circuit run without those components in place... yes, but under certain conditions, it might be possible to "flame" some components without it. R19?? Did you mean R9?
  2. I

    help with producing a current waveform

    When your output is linear, you are probably operating in the MOSFET's "ohmic region" where the FET looks just like a "pot". Once your gate voltage gets too high, the FET goes full on and there is no longer any correlation (linear) to the gate voltage vs. drain current. It would help if you post...
  3. I

    0-30 Vdc Stabilized Power Supply

    Where is there "shielded cable" connected to the output of U2?? QUANTIFY the amount of capacitance it would take to make U2 possibly oscillate, and why that would happen given C9 is in the circuit??  In this configuration it's some sort of gain limited integrator in combination with R15, Q2 b-e...
  4. I

    0-30 Vdc Stabilized Power Supply

    C4 has NO affect on U3 until you hit current limit, at which point U3 turns on just hard enough to reduce (clamp) the voltage at U2-pin3 such that the drop across R7 becomes small enough to "release" U3. Having R9 will slow down the discharge of C4, not speed it up. Until you hit current limit...
  5. I

    confused about voltage regulator spec

    That is correct, they do have resisistors inside of them that are trimmed with lasers when the wafer is being tested. BTW- there are capacitors in there too, and some even have inductors.
  6. I

    FETs source voltage

    The key is Vgs relative to the drain current. Remember "load lines"?? Vgs will dictate how much current can flow. Also... use caution when looking a simulator results!! They are only as good as the model!!
  7. I

    ISS108 diode information reqest

    Even running the simulation within the recomended frequency range, I couldn't get much more than 12V. Now "tweaking" the LC, that will do a lot for the simulation (36Vout), that doesn't mean much unless it's backed-up with real world data.
  8. I

    confused about voltage regulator spec

    The die will be the same, only the current limit point will be trimmed (laser) to a different point. The carrier size is for heat.
  9. I

    transformers

    Unless you know the core characteristics, you will not get too far!! Thing like saturation flux density, best frequency range for the material, etc.
  10. I

    ISS108 diode information reqest

    Neither... an unlimited current square wave generator at frequencies from 20KHz to 300KHz.
  11. I

    Care for Lead acid batteries

    The best thing to use is de-ionized water if you can find some. Go to a good golf cart forum... they deal with this sort of stuff every day!! Check out http://www.golfcarcatalog.com/phpbb2/viewforum.php?f=2&sid=9d4161888160d5bbdf41fac46ef484ba
  12. I

    ISS108 diode information reqest

    Yup......... your right!! I guess that's what happens when you get old and take a "stupid pill" in the morning!! I have not built this circuit, but I did try to simulate it in 3 different simulators, Workbench, Intusoft and MicroSim, with the same results every time. I couldn't get a output...
  13. I

    ISS108 diode information reqest

    That will never happen... read my post above in regards to the value of R1!!
  14. I

    A "silly" question about a resistor and a led position

    Are you suggesting that the Norton & Thevenin Theorems somehow says that it makes a difference in this circuit???
  15. I

    Why? Supply pins position differ in Dig & analog IC's

    More often than not, it's a matter of convienience when connecting the die to the carrier. You don't want the bonding wires running all over the place.
  16. I

    Stereo to Mono

    I am not a "RF" person, but to the best of my knowledge, FM (Frequency Modulation) is a "line-of-sight" transmission, in other words, if you drive behind a mountain, which blocks "line-of-sight" to the transmission antenna, you will loose the signal. If the signal got so weak that the receiver...
  17. I

    Massive Heat Sink for MosFet ?

    You don't... the FET's "share" the current so it doesn't have to be as large. If you don't like that thought, then solder the the "third" leg to a "bus bar".
  18. I

    ISS108 diode information reqest

    Looks like D1 clamps the negative portion of the waveform that's AC coupled thru C4 and D2 is the rectifier. The only thing you have to keep in mind when selecting the diode is PVI (peak inverse voltage) and the current rating. Use a Schottky diode for a lower forward drop (better efficiency)...
  19. I

    A "silly" question about a resistor and a led position

    It's a series circuit... it makes no difference in which order you place the components. The same current flows through the ALL the circuit elements (battery, restistor, LED).
  20. I

    Theory discussion moved from Q/A

    John, As I said before, from an analytical standpoint I agree you. No one disputes that under certain conditions, the 2N2219 will smoke, but that will ONLY happen when the pass transistors Hfe is at it's minimum. So, unless you have statistical data, that you can post, from the 2N3055...
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