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  1. BGB

    This won't work will it....

    I actually have the same basic motors in the linked page (albeit without the gearboxes), but even trying to spin up the motors (under no load) it likely do blow out the motor shield (they typically pull in excess of 4 amps when spinning up, and only really drop to around 1.5A-2A after they have...
  2. BGB

    Does any one know an inverter chip that uses 12V DC to make a signal with variable freq and Voltage?

    I would just assume plug something like an Arduino or similar into an L293 or similar, then write a little code to generate the appropriate PWM signals. though, I guess for non-controller options, a person could use an L293 and a 555 timer and an adjustable voltage regulator and similar, using...
  3. BGB

    FPGA circuit design prerequisites

    yes. luckily, I have not fried any of my controllers (generally I am using Raspberry Pi's). but, have blown enough transistors in my boards built to drive motors though. tried using an L298 to run a stepper, but even the small stepper was too much for it apparently (and I was like, "screw it...
  4. BGB

    misc idea: small (3-phase BLDC) motors with built-in drivers.

    this is one of those ideas that keeps popping up (mostly in the context of robotics use-cases). I am mostly interested on opinions, or if such a thing could be technically / economically feasible. ADD: well, they basically exist, but are generally crazy expensive, so it is more a question of...
  5. BGB

    FPGA circuit design prerequisites

    can't say for certain, but I think this is more in the HW/EE path. CS tends to be a lot more concerned either with pure software, or alternatively mostly with business computing. depending on the college, CS may focus on either things like programming languages / compilers, operating systems...
  6. BGB

    Transformer

    apparently, this is part of why they make them foil-wound and coat them in epoxy. doing things this way, they can apparently push the operating temperature up considerably without the transformer frying itself (there is no enamel coating to worry about, as a separator is used, nor the issue of...
  7. BGB

    How to Test MOV varistor

    a lot of things will do this in the right circumstances (transistors, diodes, ...). recently (last night) basically had a board blow-up, where transistors and similar lit up like Christmas lights (turning bright red) and started spewing smoke and fire, the event also destroying several 30A...
  8. BGB

    What are these electrical components?

    what info I can find implies it is an 0.47uH inductor. but, yeah. if so, it should look about like a shorted component on a multimeter.
  9. BGB

    Transformer

    even this may depend some on how hot the transformer is designed to run under continuous and peak loads. for example, it may be running hot enough to burn and blister ones' skin if they touch it, but still running under their rated continuous load (*). it may also depend on things like what...
  10. BGB

    Transformer datasheet

    I had a transformer out of a UPS (some have them, others don't), a block of somewhere around 10lbs (4 or 5 kg) of steel and copper. it had the name of a company on it, and some other numbers. was eventually able to track it down, basically a Chinese-made transformer (theoretically) rated for 2...
  11. BGB

    induction...

    here is a partial diagram, which shows most of the relevant coil-related electronics.
  12. BGB

    induction...

    yeah. I suck at expressing thoughts in an organized manner. I naturally tend to think of things visually, and have to try to express the things I see as words (well, some of my thoughts are also text, so it is mostly a mix of text and images). as for the topic, it is basically a thing of...
  13. BGB

    induction...

    I am mostly trying to understand the specifics. in particular though, it is for when using an alternator as an electric motor, trying to get a better idea what all is going on (could be relevant for using it efficiently, or figuring out how things might be done differently in terms of winding...
  14. BGB

    induction...

    voltage rating, not hard, as most of the diodes I have seen have fairly high voltages (1000v), but the current rating is insufficient in this case (hence probably why they were getting hot, and in these cases I was seeing more than the rated current through them). as for continuing breifly and...
  15. BGB

    induction...

    some recent observations imply my understanding of induction seems weak. at first, I used some smaller diodes in a circuit, expecting the current from the inductive flyback to to be small relative to that driving the load (say, one drives 1A into a coil, maybe seeing 50 or 100mA going back up...
  16. BGB

    Basic question - current

    (trying to explain as I understand it). it is basically like a chemical electron pump. in a battery, there is a chemical reaction which wants to occur (such as sulfuric acid turning lead metal into lead sulfate in a lead-acid battery), but it can't because electrons aren't where they need them...
  17. BGB

    Correct voltage translator

    he was off by a factor of 60 due to mixing up seconds and minutes, and 3600 pulses/rev is drastically higher than what I have generally seen from motors. or, IOW, stuff isn't really adding up (either the motor operates faster than any I can currently confirm as existing, or the encoder is more...
  18. BGB

    How can i power a USB device from two Sources

    yes, ok. it seems I failed to read it well enough to realize the input was probably already regulated...
  19. BGB

    Correct voltage translator

    yes, this is also possible. as for the topic of stepping down signal voltage, one strategy I had used before was to use a voltage divider circuit (a few resistors) to step down the input voltage to levels I could use to switch a transistor, then using the transistor to get voltages at the...
  20. BGB

    How can i power a USB device from two Sources

    though, if it is powering a USB device (namely, the phone), I think you will need a 5v regulator in addition to the diodes. basically, USB devices are designed for 5 volts. if you give them 12 to 15 volts or so (what one may get from a car, *), this could be bad. diodes could be used either to...
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