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  1. Fish4Fun

    Pieces Parts and tools....What's on your bench?

    This is a sort of rambling attempt to glean information by sharing information. It started off as a post about diodes, but I just couldn't stop, LOL, so here is a laundry list of what is on/around my bench and out in my shop as well. If you have something in your DIY inventory that I haven't...
  2. Fish4Fun

    New to the forums and looking for some advice

    Rhett, I am going to take a SWAG at where you are headed: You want to use one electric motor to turn a second electric motor which will produce more electricity than you input into the first motor? You really should be careful with this type of design, all sorts of people will tell you that...
  3. Fish4Fun

    Step-down transformer suddenly stopped working - but why?

    really? Really? you should take the multimeter back and buy another transformer, the MM has already put you in danger once and is likely to do so again. Fish
  4. Fish4Fun

    Steve Jobs Memorial Challenge

    ultrafire3, Hrmmm, are you planning on building the processor itself? If so, you should give serious consideration to its core features first. For instance bus width, mux inputs, I/O mapping etc. The next step in any modern processor design would be to model the core in an FPGA. Once the...
  5. Fish4Fun

    Thoughts on a switch

    OK, so it turns out I am an idiot (who else knew?) The switch is almost certainly a magnetic relay, and it operates just fine on my multimeter (when said multimeter is NOT configured in "Current Mode"!) Mystery solved. Sorry for being obtuse. Fish
  6. Fish4Fun

    Unstable latching circuit`

    Latching a thyristor in a DC circuit is about as difficult as dropping an egg. The outcome is highly predictable and you have to go to extraordinary efforts to avoid it. Fish
  7. Fish4Fun

    Unstable latching circuit`

    If you want to use a semi-conductor to latch the relay on, use an SCR with a holding current < the relay current. Fish
  8. Fish4Fun

    Thoughts on a switch

    So in my life I have been playing with electronics and water for a very long time. I thought I had a pretty good grasp on both, but I am a bit perplexed.....I ordered a couple of these...
  9. Fish4Fun

    The Ultimate Transistor Amplifier

    ****WOW Is that an analog scope with a CRT screen? WOW**** LMFAO.....sorry, I couldn't help myself. I will be very frank: From your initial post in this thread, I honestly dramatically underestimated you. My apologies. I applaud your efforts! As previously stated, back in the late 70's...
  10. Fish4Fun

    How to measure electric power?

    ArFa, I don't know your background, but measuring 3-phase power can be more than a little tricky, especially if the load isn't balanced and/or is highly reactive. Most businesses that use 3-phase power recognize the need for professional engineering help in load management and either contract...
  11. Fish4Fun

    To the ADMIN(s)

    LMFAO, it did it on post #6. hehe. Again, don't sweat the little stuff, I just thought I would mention it. Fish
  12. Fish4Fun

    To the ADMIN(s)

    I was NOT suggesting you eliminate the 30 second rule! Only that there is another setting that catches this. It REALLY is not a big deal, and since I started this thread it hasn't happened a single time, LOL. But it did happen about 50% of the time over several days. I will pay closer...
  13. Fish4Fun

    Help on circuit

    @Kris Mark to Space --> I wasn't, but I am now :-) Not doubting your math (though it differs from mine), but everything is stable @ 254:1. Schematic --> @50 years old I have a much better handle on my oppositional defiance, and meds for my ADD/ADHD, so I will update the schematic to...
  14. Fish4Fun

    To the ADMIN(s)

    Of late when I click "submit" i get the error message about not not posting within 30 seconds of a previous post. Obviously the entry was "double entered" as if I had hit the submit button twice, and "cancelling" and returning to the thread reveals my post was in fact accepted. Sadly I...
  15. Fish4Fun

    PWM controlled DC motor issues

    blumpkinson, At the risk of simplifying your task, have you considered a solenoid valve? http://stores.ebay.com/WIC-Valve?_trksid=p2047675.l2563 I mean if you are replacing versus repairing, why not make it simple? Look @ the gravity feed models for low pressure applications. Fish
  16. Fish4Fun

    COOL TOY! The Ion Chamber.

    I followed all the directions but I am having difficulty locating uranium....I put all my stuff in a backpack and went over to the nuclear power plant, I figured they'd have some for sure and might let me have a little bit to test....the security guards were very narrow-minded about my request...
  17. Fish4Fun

    Doorbell IC circuit -Black Bob

    black bob (sic blob).....rajat, yes, as you state it is an IC. The packaging format is "un-potted" or "un-packaged". This is generally done with very high volume PCBs where saving $0.02 means adding 6 figures to profits....sadly, it also means that the device is so cheap to mfg that they do...
  18. Fish4Fun

    Help on circuit

    @==>Kris 1) Schottky diode in series w/AVR Vcc....Sadly I didn't number the diodes, but as there is only one marked "Schottky", hopefully this is clear....Isn't there already a diode "in series" with the AVR Vcc? The fact that it is also the "fly back" diode really doesn't change its...
  19. Fish4Fun

    H-BRIDGE schematics

    @==>reviser 500hz is pretty slow. Make sure to read AN-978 from IR, it works through calculating the boot strap caps based on switching frequency. I have run into real trouble trying to use the H-Bridge HS drivers by neglecting to heed the 30 pages of information in AN-978. Even with careful...
  20. Fish4Fun

    DC Motor drive

    colum, You should look into PWM and h-bridges, but even then 6A @ 27V is fairly hefty (162W), this is an awful lot for a first go at a power circuit! You might notice the schematic has the output limited by a 1A fuse. That is a clue. Using a transistor as a current limit in linear mode has...
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