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  1. J

    Desktop help.

    Just so you know, I been fixing computers for 15 years as a career. The slowest computer I ever met was caused by the spool server thinking it had a job to do. Very long story short, if you have ever used or now currently own a lexmark printer, unplug it and take it out back and shoot it with a...
  2. J

    Portable Game System from Scratch - Where do I start?

    All they have done is hacked up an old game system and put it into a portable package, lame!!! Unless you build your platform out of an architecture that already has games created for it you are super screwed, because game development takes years even with teams of highly experienced...
  3. J

    Power Arduino Uno from 12V supply

    http://arduino.cc/en/Main/ArduinoBoardUno recommended 7 - 12 V max limits 6 - 20 V
  4. J

    Could use some help on how to do this.

    Wire each battery box in parallel and then wire up one switch for all the monkeys.
  5. J

    simple transistor amplifier

    http://goo.gl/PNLkR Take a look at this and see if it doesn't help clarify things a bit
  6. J

    Anti static wrist strap

    As PM suggested, imagine your left hand touching a live wire while your right wrist is tied straight to ground with no resistance in series. I see a quick way for you to meet your maker. :)
  7. J

    Anti static wrist strap

    Couldn't you just use a grounding cable screwed into the metal box and run through a small hole in the face plate?
  8. J

    Bought wife a broken tradmill, help me redeem myself!

    $50 dollars for treadmill $200 for new controller I bet you could find another treadmill for $150 and not have to worry about this mess. :) On another note, power the motors with the power supply, you will kill two birds with one stone.
  9. J

    Help building an alarm system

    Well you don't give a whole bunch of information about the purpose of your alarm. So one can only speculate on what you need. This is something I was working on a year or so ago. It uses a simple voltage comparator to trip the alarm and then after a set time the alarm will be reset ready to...
  10. J

    What Soldering Iron Wattage for PCB Work?

    15 watts won't even get you started.
  11. J

    230v sub. well pump

    As I understand it, 3 phase here comes in two flavors a wye and a delta configuration even though I don't really understand the fundamental differences. There will be three transformers, tapped into the three wires on the pole with three wires coming from the transformers to your building. But...
  12. J

    230v sub. well pump

    so that is why the rms voltage is additive, but why is a double pole breaker hooked into one leg read 0 voltage across it's to polls. Never mind I think I just answered my own question. For a voltage to be present you need to have a voltage difference between two points, if both points are at...
  13. J

    Help with finding a Monitor for 220 appliance electrricity usage?

    You could also look at the "kill-a-watt EZ" meter. Not sure if those will accept 240v input though, I know the max amp rating is 20 though.
  14. J

    Help with finding a Monitor for 220 appliance electrricity usage?

    Use a refurbished electrical meter in a meter box. :) This would also give you the convenience of being able to read the usage in watt/hours. They sell them on the internet. I seen some sold before for like $40 dollars http://www.rvparksupplies.com/p/METER/ ^^^ $80 dollars with box.
  15. J

    230v sub. well pump

    Yep, I think I get it. I even learned a bit about my old ass breaker box. I tried putting in a 2 pole breaker into two slots but both were attached to the same pole. So while each had 110 reference to ground I got 0 voltage from what you called A-C. As soon as I realized this, I switched the...
  16. J

    230v sub. well pump

    What do you mean "a copy of the regs?" I read the manual and the only thing they tell you is how to hook it up.
  17. J

    230v sub. well pump

    How does a 2 wire 230 volt w/ ground pump work exactly without no neutral leg? Can someone please explain to me how this works. Don't you need to make the "loop" so that current can flow, or is that what the ground does?
  18. J

    Automatic chicken coop door opener

    use a binary counter. I like the idea of a trigger when all the hens have sit on their roost. This way you could use digital logic to close the doors based upon their instinctive behavior.
  19. J

    Picking transistors

    What formula are you using to figure rms value for current? This is where I get lost so please excuse my ignorance. edit: wikipedia answered my own question, a/sqrt(2) or 1.41
  20. J

    Picking transistors

    So I want to know how one would choose a transistor for this classic Class A amp circuit given my specs. Also, what would be the power output if this was connected to a standard 8 ohm speaker? Vcc 24V Ic 50mA hfe 50 I looked over at digikey and after a few filters applied I ended up with a...
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