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  1. HANKMARS

    Transistor prototype photo

    Here is a more clear photo of the " first " transistor that I used as an avatar for a short time. A square centimeter can now hold what, a few billion, maybe a trillion transistors ? Actual physical problems of an atomic size nature are the current bottle neck is what I hear. The transistor is...
  2. HANKMARS

    Optics, filters probably

    There is almost a correlation here.
  3. HANKMARS

    FET question

    Thank you.
  4. HANKMARS

    Grounding question in regards to battery powered inverters.

    Inverter output is fully floating. Waveforms 1A and 2A are what I was concerned about but after changing scope ground to inverter neutral, the waveform looks much more reasonable. Peak to peak of inverter seems a little thow. All shots take at 50V per division.
  5. HANKMARS

    FET question

    Interesting article. Thank you. I downloaded as PDF. Interesting note is that PMOS device will have 3 times the Source to Drain resistance as an NMOSFET. I am thinking I may well modify my project design to accomodate an N type FET for power out stage since I am probably wasting battery power by...
  6. HANKMARS

    Grounding question in regards to battery powered inverters.

    I desire to earth ground my 12V inverter in hopes of cleaning up its output waveform. Inverter is regarded as "pure sine wave" category, if I am remembering the terminology correctly. I realize "pure sine wave" is more of a category than a specification. It does have a pretty good looking output...
  7. HANKMARS

    FET question

    I have forgotten, or perhaps have never known, the function of the zener diode connecting the source to the drain, internal within a FET. Is the zener inherent of the fabrication of the device or is it engineered and added? I suspect one function may be to keep current carriers from traveling...
  8. HANKMARS

    Balanced load, splitting a 220V outlet

    OK. Very good. I may have been seeing a ground wire on power poles and assumed that it was the neutral when in fact the ground wire is perhaps a safety measure should something up top go a muck. I suppose it would keep any static charges from accumulating also.
  9. HANKMARS

    Balanced load, splitting a 220V outlet

    My assumption is that neutral is the center tap of the line transformer, and from there, is taken to ground. Close?
  10. HANKMARS

    Balanced load, splitting a 220V outlet

    Each circuit immediately enters another breaker panel with its distribution. Forgot to mention that.
  11. HANKMARS

    Balanced load, splitting a 220V outlet

    Built with American tools by a two time Union member. " Code ?" that's subjective. I generally strive for above code and that pretty much lands me inside tolerable. My work generally exceeds the state of the foundation circuit, mainly because of tech advancement.
  12. HANKMARS

    Balanced load, splitting a 220V outlet

    Let me see if I'm getting a grip on this. For instance; take an electric clothes dryer. I'm guessing the barrel drive motor, and heating element, and its blower fan, are in parallel with, and designed to utilize what is, I believe, called single phase 240V. Let's delete the blower fan. In...
  13. HANKMARS

    Balanced load, splitting a 220V outlet

    In the main breaker panel I have a 50A, dual phase breaker. This feeds a typical electric clothes dryer outlet. Two hots, one neutral, one ground. I would like to go from that outlet to a 110V 4-way box. The 4-way consists of two duplex 110V three prong outlets. I would like to take phase A to...
  14. HANKMARS

    Optics, filters probably

    Just quite coincidentally, this red pass film was part of a postal envelope I received. Certainly blocks green and blue effectively. I do realize this post is more suited to a physics or chemical testing lab forum but I am not a member of either. Hey, optics are optics.
  15. HANKMARS

    Diode identification problem

    Surface mount device. On the bottom of the case are embossed R6 and under those two, 0P. Also, on top of the device appears to be a circle with a line attached that runs to cathode marking. The letters inside the circle appear to read ON. I think it may well be a manufacture insignia. The circle...
  16. HANKMARS

    Optics, filters probably

    100% agreed. I'm thinking fire assay, Copper, cobalt , f, who knows?
  17. HANKMARS

    Diode identification problem

    I came across a shorted diode which needed replaced. It read 0 Ωs in both directions. The part number most significant appeared to be RB30. Above that was a number A34. The silk screen indicated a zener diode. I found a datasheet containing a list of zeners which contained the RB30 sequence...
  18. HANKMARS

    Optics, filters probably

    I have an idea of what these glass filters may have been used for but, so as not to influence your thinking, I will mention those ideas later. Also, someone may know exactly what they are. The red filter lets absolutely no light, emitted from a blue LED, to pass through it. I may use the red...
  19. HANKMARS

    OOPS! I MEAN BIG OOPS, MAYBE. ROOKIE MISTAKE

    Oh I agree, I need to review some rules and find the crossed wires or missing component that is befuddling my handling of equations. The notion I just came across is most likely missing a most fundamental rule but without pencil on paper I'm don't think I can retrieve the reasoning or the...
  20. HANKMARS

    OOPS! I MEAN BIG OOPS, MAYBE. ROOKIE MISTAKE

    In regards to rules of exponents, it seems when using an exponent with terms of area, a 2 dimension concept, as opposed to a line, a 1 dimensional concept, there must be a dangling exponent of positive 2 that has to find a place in the formula.
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