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  1. Fish4Fun

    Converting 3 phase machine to single phase

    @Minder the OP's pictures would seem to indicate the motors are 3-phase synchronous induction motors designed for 50hz-60hz grid operation .... while a typical VFD is certainly capable of 50-60hz output, they are NOT typically designed for 1) Running Multiple Motors 2) Allowing the output legs...
  2. Fish4Fun

    How do I add a wireless controller to a PWM box?

    pstar, Welcome to EP! Is remote control of the pictured device **possible**? Absolutely! Simply Put: NO. Why? In short, mass-market consumer electronics give people the impression that all electronics are cheap, this simply isn't the case. A typical consumer-mass-market electronic device...
  3. Fish4Fun

    Multiple mosfet driving

    I would suspect the large value gate resistors are to limit di/dt and are an important part of the circuit. I would also ass-u-me that the switching frequency is VERY low, perhaps as low as 0.01hz to 1hz if the mosfets are being used used to switch the charging current on/off. I am...
  4. Fish4Fun

    inverter problem

    suleman, Welcome to EP! Folks here are in general happy to help with electronics questions; however, it is important that you do your part by having reasonable expectations and asking specific questions with salient details. From your post it would appear that you purchased a Dell laptop...
  5. Fish4Fun

    Switching Power Supply

    Perfect! Enjoy!
  6. Fish4Fun

    Switching Power Supply

    Hey Wiggi! Knowing that you are building a proof-of-concept unit (likely @ home?) changes your options considerably .... especially if your employer is not funding the project. I would suspect that an industrial power supply for production use could easily cost a thousand dollars and be more...
  7. Fish4Fun

    Replacing a gen-set voltage regulator with generic AVR

    Idcarter, I understand the stubborn desire to make it work, but you would likely be $$ ahead to sell the 18HP motor and carry the generator to the scrap yard. You might actually get more for the motor w/o the generator if it is suitable for go-carts, LoL ...or mount a pressure-washer pump to...
  8. Fish4Fun

    Switching Power Supply

    Hey Wiggi, Again, what I know about electroplating is from reading about various processes, not from hands-on experience with industrial implementations. I would certainly **think** that any MFG offering a pulsed DC power supply to industrial customers would include both frequency and...
  9. Fish4Fun

    Replacing a gen-set voltage regulator with generic AVR

    Hey Idcarter! Not sure what your time is worth with respect to this generator, but my first thought would be to contact Dayton/Graingers about a replacement module. Assuming you have done this and were unable to procure one; I would suggest you attempt to find a relatively local repair shop...
  10. Fish4Fun

    Switching Power Supply

    Hey Wiggi! I know more about electroplating theory than practice, but I know that pulsed DC is used in some electroplating processes, and I would assume that there are industry standard products readily available ..... A google search for "electroplating power supplies" yields a fair number of...
  11. Fish4Fun

    Switching Power Supply

    Hey Wiggi, Welcome to The EP Forum! There are numerous ways to achieve pulsed DC .... Strictly speaking all that is required is a signal source (2mS on 4mS off), a Voltage/Current source and a "Switch" ... but the Devil is in the details ;-) You mention this is a project for a work...
  12. Fish4Fun

    carbon steel screw versus brass screws

    Hrmmm, I think there is A LOT of over-thinking going into this... LoL! The **new outlets** I have on hand have 2 * "Gold Colored" screws on the "line" side and 2 * "Silver Colored" screws on the "Neutral Side" and a single "Green Colored" screw for the ground connection ..... The "color" of...
  13. Fish4Fun

    DIY SLA BMS

    Hey Jake! The trouble with 40 of anything is the cost/effort of implementing a solution. Too frequently the most cost effective solution is to reduce the redundancy to a manageable number .... Lead-Acid Battery management (in general) is relatively simple .... with a few caveats ...
  14. Fish4Fun

    FSAM75sm60A Fault Protection Timing Circuit

    Hey Hop! @ "I think the whole design is obsolete now..." Assuming you were talking about the FSAM75sm60A chips.....not doubting your findings, but Digi-Key currently has 48 of them in stock ( http://www.digikey.com/product-search/en?keywords=FSAM75SM60 ).....Granted Digi-Key wants $78.20 each...
  15. Fish4Fun

    FSAM75sm60A Fault Protection Timing Circuit

    Hey HOP! This family of Chips are designed primarily for driving 3 phase motors for low to medium power applications (this particular chip is for 2kW to 6kW motors)....suggested uses are HVAC fans/compressors/pumps, Consumer Washing Machines etc, etc.... As I understand it, IGBTs are designed...
  16. Fish4Fun

    FSAM75sm60A Fault Protection Timing Circuit

    Hey Hop! Ok, I "see" the extra arrow in the IGBT....so there is some voltage on Pin10.....and that voltage is a function of Rsc and the current sense resistors.....I missed that, and it certainly 'helps'....But, I still don't understand how to define values for Csc, Rf and Rcsc such that: "the...
  17. Fish4Fun

    FSAM75sm60A Fault Protection Timing Circuit

    I am likely making this too hard, but a bit of help sure would be appreciated! I picked up some FSAM75sm60A "NOS" ICs off ebay a while back for cheap....and I thought I might design a test bed for one of them....I was trying to "rough in" some component values from the data sheet, and things...
  18. Fish4Fun

    Obscure high power electronic device,what is it?

    Would make a FABULOUS Tesla-Type Arc generator ;-) 30kV is a lot of potential voltage.....use EXTREME CARE if you decide to "play" with it.....and make sure you are not anywhere near wires (ie power lines in the walls....cat-5 cables, antenna wires etc, etc) if you power this thing up almost...
  19. Fish4Fun

    Need Advice: Software to Read an IC

    Hey MrElectronicsMan! K, I was pretty certain this was a "home automation" project.....and the fact that you "don't need the relays" **could** make things easier.... In all projects there are several considerations that determine viability, namely: 1) Cost 2) Effort 3) Perceived Value of the...
  20. Fish4Fun

    slip ring connectors

    @Harald Kapp..... Fair enough..... @donkey Ignore my previous post and carry-on! Good Luck! Fish
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