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  • Users: pucca
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  1. pucca

    [b]How to check a PCB Prototype[/b]

    OK thanks guys for the info! If anyone has a goob manual or book to propose I would appreciate it a lot :)
  2. pucca

    [b]How to check a PCB Prototype[/b]

    Hi! What are the basic steps in order to check your new prototype board? What should you check at first...things like supply, clocks(to see if the board is working and then what)? Thanks!
  3. pucca

    SPI BUS and slave devices

    I have already added a bat54j schottky diode. So if there is a problem I guess that it will show..I'll have the board in about one week :)
  4. pucca

    SPI BUS and slave devices

    Sorry but I got confused from itsmoked answer..I added the buffer...
  5. pucca

    SPI BUS and slave devices

    The sensor has a CS pin. Do I stll have to add a buffer or a diode to the SPITXD line? When the CS of the sensor is not enabled why should I add the buffer to the spitxd line?It can't sent something as long the cs in not enabled...correct?
  6. pucca

    SPI BUS and slave devices

    Hi guys, I have a SPI bus with several slave devices, usb controller, tranceiver and sensors. There is an independent slave select line for each slave. If I am not wrong most devices must have tri-state outputs that become high impedance ("disconnected") when the device is not selected. I have...
  7. pucca

    Problem with 2 different supply voltages on PCB

    thanks for the tips.....
  8. pucca

    Problem with 2 different supply voltages on PCB

    The first voltage comes from a Li-Ion battery(3.7Volts) and the second(3.3V) comes through a connector of another board. On this other board the 3.3V comes from a dc/dc converter. So I think that this should be a problem according to you....(macgyvers2000)
  9. pucca

    Problem with 2 different supply voltages on PCB

    You mean when changing from one voltage level to another level, for example when using a regulator or a level translator( that causes crosstalk)? So when you have two different supply voltages is not a problem?
  10. pucca

    Problem with 2 different supply voltages on PCB

    Hi everyone, I have a 2 layer board with one GSM and one GPS module. The operation voltage is 3.7V and 3.3V for the GSM and GPS. Is there a problem for the two voltages to be on the same board? The tracks are not very close to each other(4 cm at least) and the board thickness is 0.5mm. If the...
  11. pucca

    Has anyone used Eagle Cadsoft?

    I named the polygons and everything is OK.Thanks a lot! Another thing I wanted to ask is how can I have a ground poured all over the fisst signal layer? Is there a way to define it in eagle ?
  12. pucca

    Has anyone used Eagle Cadsoft?

    Hi, xray..since you have used Eagle do you know why the airwires of the gnd or the vcc (I have defined with polygon a ground plane and a supply plane) remain after I have placed a via to ground or vcc plane?
  13. pucca

    Has anyone used Eagle Cadsoft?

    Unfortunately Ctrl+X didn't work, Eagle has some group+cut+delete instruction to cut an object from the layout.So I had to rip up all the traces and define the power plane. Thanks anyway! :)
  14. pucca

    Has anyone used Eagle Cadsoft?

    Hi I'm using Eagle Cadsoft v5.0. I'm making a board with four layers. Top-Signal Layer2-GND Layer3-Vcc Bottom-Signal My question is why I can't define a supply layer after having placed tracks between the layers.If I try to do so it pops me out error saying that...
  15. pucca

    Choose Switching Regulator for Telit GM862-GPS module...

    Thanks comco!
  16. pucca

    Choose Switching Regulator for Telit GM862-GPS module...

    I am very happy because LT3481 was the one in the top of my list(as well as LT3681). I have found some inductors by TOKO: http://www.tokoam.com/passives/inductors/fixed_inductors/pdf/TOKO_SMD_Fixed_Inductor_Ferrite_Series.pdf However in the datasheet only the inductance and the Rated DC...
  17. pucca

    Choose Switching Regulator for Telit GM862-GPS module...

    Thanks treez!It should be an easy job if you knew what all these parameters of the regulators really mean. I know the basic specs that the regiulator should meet , Vin(3-9Volts) Vout(3.4-4.2Volts), Iout max = 2A, and switching frequency at least 500kHz, but those I find have so many other...
  18. pucca

    Choose Switching Regulator for Telit GM862-GPS module...

    Hi I want to use a step down regulator from 9 Volt battery to 3.8 Volts of GM862-GPS module of Telit. I have looked at maxim's regulators but I can't figure out which one is more suitable for the GSM. I want a regulator as simple as possible (with one DC output)..... Thanks in avanced :)
  19. pucca

    Where can I find bidirectional Rf amplifier?

    Ok I got it..there isn't such amp....thanks alot again for the help guys ;)
  20. pucca

    Where can I find bidirectional Rf amplifier?

    Hi I need to find a bidirectional rf amp, surface mounted at 2.4 GHz. I could use switches and two rf amps but I would rather not to(I have one rx/tx path).I haven't found something though I have searched the net :) Thanks in advanced!

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