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  1. Gazza1

    Can I shorten the SLA battery charging cycle?

    Can you be more specific on the type of battery. Make. Model, Ah rating and Wattage rating
  2. Gazza1

    Automated plant watering

    If I was doing this, I would use a Microcontroller. I have no experience in soil sampling, so I don't know what the proper device is, I did find this. http://www.berryhilldrip.com/Irrometr.htm#Model%20'R You could set up the controller to monitor the output level of the sensor and set up some...
  3. Gazza1

    Inverter Generator

    I know this is an older post, but I have a lot of UPS experience. It sounds like you found an old Emerson UPS with bad batteries. Most likely there is only a few bad batteries in the string so you wont need to replace all of the batteries. What you need to do is get a constant current supply...
  4. Gazza1

    How about articles

    For the money, if you want to teach yourself, try www.automationdirect.com. It is a fantastic site. Also if you just want to try using a simulator, google "The Learning Pit" They offer an excellent AB PLC 5 simulator. I am pretty sure it only costs $25 and it comes with a bunch of examples.
  5. Gazza1

    Frequency Division

    In the power field we use a drive circuit. This means we rectify the signal, then using an inverter reconstruct the wave at the frequency that is desired. In a low power application I am not sure what the most efficient method would be.
  6. Gazza1

    Cutoff frequency and 3dB points

    That is an excellent answer. I am convinced.
  7. Gazza1

    Skin effect articles

    Perfect, thank you.
  8. Gazza1

    Cutoff frequency and 3dB points

  9. Gazza1

    Cutoff frequency and 3dB points

    That quote from this page says it all. http://www2.okisemi.com/site/faq/speechfaqs/speechgeneral/general6
  10. Gazza1

    Cutoff frequency and 3dB points

  11. Gazza1

    Cutoff frequency and 3dB points

    This is a method of calculating bandwidth. The bandwidth is the the difference between the upper and lower 3db points.
  12. Gazza1

    Quick questions about transformers

    Yes, that is right. However that is only true if that is how the secondary terminals are marked. Transformers are always rated in VA. In this case you have a teansformer that is 24V @ 12A. VA = E x I = 24V x 12A = 288 VA I hope this helps, Aaron
  13. Gazza1

    DMM

    Hi Stoodent, You can buy a pretty good home meter for that price. Just make sure that when you choose your meter it is a true RMS meter. The cheaper meters typically aren't. Also try eBay, I have seen some pretty good deals on there. Try the Fluke 110, $117...
  14. Gazza1

    Skin effect articles

    Hey Everyone, Can anyone direct me to some articles on the topic of skin effect in conductors? I need a good reference for calculating wire resistance for a given frequency and distance. I am also interested in the mathematics behind the Litz wire.
  15. Gazza1

    Biuld UPS...

    Woirking in the Power Electronics and Power Quality field, I deal with UPS's all of the time. Even a small 500VA UPS is a very complicated machine. It is not designed in two parts, it actually has many more pieces than that. Since most modern UPS's are "online" I will include a block diagram...
  16. Gazza1

    newbie again! a few questions

    I wouldn't buy a power suppily, build one for your first project :) http://www.electronics-lab.com/projects/power/003/index.html
  17. Gazza1

    Neutral , ground & earth

  18. Gazza1

    PLC and Power Electronics Forums

    As a Power Electronics Technologist, I would really love to see an area specifically for Power Electronics. Also since I am a huge PLC nerd, it would be very cool to have a space for PLC discussion. I would be more than willing to help out with the new topics. Thanks, Aaron
  19. Gazza1

    Hello Everyone

    Hey there everyone, Just wanted to say hi as I just signed up for this board. I am an Electrical Engineering Technologist. I wok in the Power Quality Field in Toronto, Canada. Hope to talk with you all soon :)
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