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  1. J

    1200 watt microwave using 18a on 15a breaker

    Then how do you know it is a 15A breaker? They do make 20A breakers and 12/2 w/GND wire under 100 foot is 20A rated. A device that is 1200W will draw so many Amps based upon the formula W/V = A. Because power is equal to voltage times the current.
  2. J

    1200 watt microwave using 18a on 15a breaker

    http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1077.html I do understand the need for special purpose devices. Yes, I know the UL is an american standard.
  3. J

    1200 watt microwave using 18a on 15a breaker

    We can agree that it takes a split second for the breaker to heat up and mechanically trip, but as coke said. This is a fraction of a second. The only kind of breaker that won't trip in less then a second on an over current condition is one that is faulty.
  4. J

    1200 watt microwave using 18a on 15a breaker

    what gauge wire is installed on that complete circuit? What is the rating of the microwave? Should it be drawing 18A? Oh never mind, I see you already said it was a 1200W microwave. Though you never did tell us the voltage. Clamp the meter only around the black wire near the breaker in the...
  5. J

    How do I ground an independent dual/triple power supply?

    I would check with my multimeter to see if the grounds on the PSU you bought have a common connection. Even then, unless the manual tells you specifically not to do it, I would see no problem in connecting the two grounds together on the pinball board.
  6. J

    1200 watt microwave using 18a on 15a breaker

    If this is an old breaker box say like one of those federal pacific's. It could be that the breaker is bad. They where known to burn down a few houses. But that is only a slim possibility. Gonzo has the question that needs to be answered. How did you arrive at those numbers?
  7. J

    I feel like a thief!

    Are tubes really that expensive? My attic is holding onto about half that many. My grandfather used to collect this stuff. Most of the ones I have state they are for TV's I believe. Are they good for anything, like audio amplifiers? I broke one, rolled off the desk. A big one, don't even tell...
  8. J

    For Sale: 2N3906 signal transistors/10kuf filter caps

    I'd be interested in some caps. Are these what you would call new-old stock? 4 should fit in a $4.99 flat rate ups box? you can pm me your paypal e-mail address or whatever it is that I need in order to pay you.
  9. J

    Need a brief explaination mW, mA laser diodes.

    Man I always wanted one of these, but after reading this thread I am thankful I never tried. I like my eyesight!
  10. J

    In-Car audio/video broadcast system

    Just a thought though. If the cops do search your vehicle and they think you are a suspect character, don't you think they will question the foot switch? I mean in this day and age, a locked metal box and foot switch, no that doesn't look odd... Have you thought about driving around and...
  11. J

    What did I do?

    The output transistors are isolated from the heatsink. Can't really see how they would be damaged. I'd start with the board you dropped on the heatsink as well.
  12. J

    Current meter is burning out microcontrollers

    Guess he doesn't understand english. Pictures are worth a thousand words. Yet he still repeats the same thing. We get it, block diagram... Now post something useful so you can get some help! Have a good day!
  13. J

    How to repair this

    yeah fathers day is coming! that should easy the pain associated with " You did what????"
  14. J

    Electronic products exam June help

    do you know how pinball works? When you lose the ball down between the little batter things, it leaves you with one less ball launch. So the scoreboard normally keeps track of this. I will assume that the OP is looking for a similar approach. I am with coke man. This is really simple for a...
  15. J

    RAIL GUN capacitor size/power questions???

    wait, is C a value of Farads? Isn't microFarads 0.000001 of a Farad? Then how is it 25kj and 25j? My calculator says 12.5 ;) supak111, as steve has pointed out. Power is not the same, so the price point for smaller voltage caps is moot because you will need more to get the same power output...
  16. J

    where would I buy a 300 amp 1.5 volt transformer

    apparently he has something in mind, but if all you are after is sparks, a car battery and a pair of stick welder leads and a welding rod will provide sparks.
  17. J

    Need some resistance help

    No this is horrible advice to charge a 12V battery to 7V, especially a lead acid battery. You will severely reduce the life of the battery. Lead acid are known for sulfation, do you happen to know how sulfation occurs? Let me help you out...
  18. J

    capacitor bus bar

    Oh I think it will get quite hot. In fact with that capacity I bet you will make some molten metal. The steel bars will provide more resistance and that will create a larger voltage drop across the bars. Creating more heat and less power being delivered to the load. The question is why?
  19. J

    Voltage Controlled Resistor

    http://www.ti.com/lit/ds/symlink/lm2937.pdf LDO voltage regulator, first graph on page seven. 5.5Vin before the output voltage drops below 5V. What is the lower limit on the input to the uC?
  20. J

    What can a analog volt meter do that a digital one can't?

    I still use an analog meter to check batteries to see if they are charged. Again using the resistance setting. Throw the battery on the probe, a quick visual of the needle is all you need to tell you if the battery is good, partially good, or bad. I can do a couple hundred batteries in a few...
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