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  1. J

    Detecting over voltage charging

    Still need the basic over voltage detection circuit though. Shunt resistor would be perfect in a such an application if you could use the heat produced. But from sounds of it this boat is a summer only hobby.
  2. J

    let's discuss COB

    You are planning to release them, so that means you have filed the patents. So do us a favor and post some specs and pics. You want an opinion, then provide us with something to state our opinion.
  3. J

    back up battery for mains supply???

    I wouldn't waste my money. Unless this is some sort of illegal grow I would just talk to the owner about upgrading the electrical to your requirements, offer to pay for it in return for free rent. I don't know too many owners that will say NO when you offer to fix up their property. You could...
  4. J

    Hello, Welcome! (Introduce yourself)

    Hello to everyone. I am a self proclaimed electrician. I use that term loosely!!! I was introduced to electricity by my grandfather and father. Both where very knowledgeable about basic electrical concepts. I really like the idea of electronics and cool analog circuits. I have built a few...
  5. J

    How to switch an AC circuit from a computer

    The usb will supply 5 volts, That should surely turn on a transistor that will activate a relay or the lock mechanism itself. The hardest part may be to actually write the program to get the usb to send a pulse long enough to unlock the door. Is it really your goal to only use this over the...
  6. J

    very shocking ceiling fan install

    The more I think about it this is why the original current regulator blew, being rated for around 1.5 amps. This also explains why Nothing happened until I plugged in the light fixture which contained the hidden disaster.
  7. J

    very shocking ceiling fan install

    Well this story got a little more interesting... After having the fan and light in working order for just a few hours a day over a ten day stretch, yesterday things got rather interesting again. So I turned on the switch and the breaker kicked immediately. I have added a few more appliances to...
  8. J

    Ground Isolation

    I might be completely wrong and misunderstanding the terminology, but when I think of isolation from the mains I think transformer. http://en.wikipedia.org/wiki/Isolation_transformer
  9. J

    very shocking ceiling fan install

    Well I did learn a lesson out of this situation. So all was not lost on that electrician 40 years ago.
  10. J

    very shocking ceiling fan install

    So I took on the job of putting in a new ceiling fan today. Not completely thinking I just turned off the switch on the wall and figured good enough. Well was I mistaken, as I started to pack up the light fixture wiring and current regulator, I felt this shock and next a spark with a loud bang...
  11. J

    the opposite of a RELAY

    Unless you are a total crap shoot at making rockets, which the TS doesn't sound like, I don't see the issue with the mercury switch. The idea is not to blow up the mercury switch after it activates the circuit. The ideal situation is to recover the rocket with the switch in still in one piece...
  12. J

    Help in calculating power numbers for green electricity project

    I am curious in knowing how I would go about figuring some numbers for a project I am interested in doing. My project involves using a wind turbine to produce power to charge some batteries. Very basic green energy system. What I want to know is how much power I will be producing and how...
  13. J

    electric code

    I called the inspector and POCO here in Pennsylvania about the work I am doing. I have got the DR# to cut the lockout tag and pull the meter. I also asked the inspector about the above issue and the answer I got was this. "You have to terminate the meter mains at a breaker if and only if it...
  14. J

    electric code

    Ok so I am kinda sketchy on the terminology here, but I have recently took on a job upgrading some outside "disconnects" I think this is what they are called. the box containing the main breaker right off the meter box. My question regarding the code is do I need to wire the breaker on the...
  15. J

    3 video card caps blown. Can this be fixed?

    Actually I looked t digi and newark. They do not carry those series or for that matter even rubycon caps at digi or mouser. I would prefer to stick to the badcaps.net website and use what others have already used with success. I had a thought to look up some old power supplies and see if they...
  16. J

    3 video card caps blown. Can this be fixed?

    I'll purchase the extra caps once I get the card back to working order. I might be making a huge mistake, but I don't see those caps blowing within a week. If they do then I have wasted 10 dollars and will still have some extra capacitors left over. btw. How does one de-solder a SMD cap? just...
  17. J

    3 video card caps blown. Can this be fixed?

    http://www.badcaps.net/forum/showthread.php?t=8413 Well what do you know, I have the badcap issue :-) Cheap ass xfx. anyway, lets get to the point. in this thread they link me to some caps for sale on that badcaps.net site. I see they have a particular brand they sell. MCZ and MBZ. What is the...
  18. J

    3 video card caps blown. Can this be fixed?

    First off I would like to know if fixing these 3 caps will help the video card? I am not sure why these caps blew. I had a pair of wires coming from a motherboard fan that was run through the caps. I used the caps on the video card as a placeholder for the wires. Now I am wondering if the...
  19. J

    transistor circuit help

    R2 value needs to pull at least 500mA of current. 24/.5 = 48Ohms. Pick a resistor value slightly higher. The B-E current needs to be a fraction of the C-E current. the ratio of B-E current to C-E current is known as 'beta' which is the gain of the transistor. You don't mention the transistor...
  20. J

    555 timer internal working

    why not use a binary counter and pull both values off one oscillation cycle. I did something similar where I held the reset of the counter high until I needed it to start counting.
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