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Recent content by edofbrighton

  1. E

    Ethernet Termination Resistors

    Ok, so are you saying that the reference schematics I've been looking at are for a current-mode line drivers and the 50 ohm RC termination seen in the left schematic is the equivalent of the series termination. Many thanks Ed
  2. E

    Ethernet Termination Resistors

    Hi, Can anyone tell me why the transmit Ethernet lines have 50 ohm termination resistors fitted at the source? My understanding is that you only need to have a termination at the end of a signal line. There should be a 50 source impedance, a 50 ohm characteristic impedance of the transmission...
  3. E

    Wireless network design

    Ok, so there's not really any benifit in terms of power consumption. Using Zigbee just offers some advantage in terms of range because you can send data via other nodes in the network. is this the sort of product you were talking about. **broken link removed** is it easy to select which...
  4. E

    Wireless network design

    Hey, been reading up ZigBee and i'm having trouble understanding something? Whats different about a ZigBee transciever and any other transciever. Every bit of information says Zigbee is a low-data rate, low-power protocal, but why is it more so than other products. Surely the power consumpution...
  5. E

    Wireless network design

    asdsad
  6. E

    Wireless network design

    hi, I'm trying to draw up a plan for a wireless sensor network that is going to be integrated into a system which monitors the activites of elderly people to see if they need some sort of assistance. I wanted to know if any one had any experience of building a WSN and if so what parts i should...
  7. E

    Masters project idea for 3 electronic engineers

    I don't intend to steel someones work. I was only asking for suggestions. Most University projects are proposed by faculty members because it obvious to them that students have not yet reach a level of experience where they can make an informed project choice. I think it is unfair for you to...
  8. E

    Masters project idea for 3 electronic engineers

    Hello, I was wondering if anyone could think of any proejct ideas for 3/4 electronic engineers to do as part of their masters. The project can be anything i would be greatful just to here your ideas. thanks, ed.
  9. E

    RF PCB design

    no, they are connected on the other side of the PCB. it is also a ground plane.
  10. E

    RF PCB design

    Yeah, that exactly what i wanted to know for both questions. looking at the PCB in the link i think this will definately have effected its performance. the blue represents the ground plane. what should i google if i wish to find more information about the ground plane? thanks, ed.
  11. E

    RF PCB design

    Also, if anyone knows why for low frequencies you don't need to impedance match and you can get away with using a short length of wire i would also be interested to know.
  12. E

    RF PCB design

    Hi, I recently made a project which had a wireless link on it, but i didn't really understand why i did some of the things i did. Basically, i want to why when you use a PCB for an RF circuit that the other side of the PCB needs to be a ground plane? Also, does it matter if the ground plane is...
  13. E

    Transformers

    Thank you, thats exactly what io wanted to know. ed
  14. E

    Transformers

    Can anyone tell me why the ratio of I1/I2 approaches the ideal value as the load current is increased, and why the opposite is true for the voltage ratio V2/V1. thanks, ed I1=primary current I2=secondary current v1=primary voltage v2=secondary voltage
  15. E

    Is it possible to change the clock source for a PIC.

    Ok, i'll try it with the 4MHz oscillator. I know the 4 Mhz can go as high as 9600, but 9600 is not a multiple of 4 Mhz so the will be some error whatever a value is loaded in to SPBRG. thanks for your help, ed.
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