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Recent content by luke67

  1. L

    Bias current and other non linearity

    Hi! Do you know if there's a way to calculate bias current effects and other non linearity effects (like offset voltage) of this analogic circuit ? Is there any software that can do that ? Thank you all!
  2. L

    Name PLUG

    Hi people! Do you know the name of the plug in the attachment ? Thank you all!
  3. L

    NOPB

    Hello. I noticed that many operational amplifier have name that end with NOPB e.g. LM1881M/NOPB, Do you know what NOPB stand for ? Thank you !!!
  4. L

    PCB & environmental problems

    one other information : the pcb has 30 gold pins spaced 5 mm one each other. If a water drop link two of them a short circuit is made and this MUST'NT happe. Do you think that between them spray will be enough or is better use silicon in order to cover empty spaces between them and avoid drop...
  5. L

    PCB & environmental problems

    should I spray it on the whole pcb or only on electrolyte parts ? Consider that the pcb will be placed in a 95% humidity room. Do you think that the spray will be enough ?
  6. L

    PCB & environmental problems

    so the only solution to be SURE that pcb won't oxydate is using sylicon, right ? If yes, only solder parts or also active/passive components ? THX
  7. L

    PCB & environmental problems

    Any new advices ? THX
  8. L

    PCB & environmental problems

    Notice that PCB have Silver Finishing and Copper 35 um on FR4 1,6 mm. Do you think is still necessary coating ? If yes, the spray will be enough to coat 95% humidity ? I have bought this one : http://docs-europe.electrocomponents.com/webdocs/0d82/0900766b80d82552.pdf...
  9. L

    PCB & environmental problems

    I am going to sterilize this board cause thei well in contact with cells. Do you have any idea how to sterilize PCB ? THX
  10. L

    PCB & environmental problems

    HI! I developped an analogic filtering PCB composed by resistor, capacitors (4 of them electrolitics) and operational amplifiers. I have to put it inside an incubator whith 90% humididty, 5% CO2 and temperature 37 °C. Do you know if and how they can affect environment and vicecersa ? Do you have...
  11. L

    Op-amp overloaded

    Hi! I am having trouble with a commercial filtering board made with operational amplifiers; here a part of the documentation: "Due to the low cut-off frequency, the baseline restorer takes some time to stabilize after switching on the amplifier or after replacing the MEA. One to two minutes are...
  12. L

    Sallen key problem stability

    yes! Now it seems to work! Do you know the exact reason why this happened ? Do you think that this problem could affect also lower gain (3, 5, 7 ... ) ?
  13. L

    Sallen key problem stability

    Hello! I am developping a filtering board for analog signals (bandwidth of interest 300-5khz). I used for this purpose a lowpass Sallen key, a high pass sallen key (all butterworth configuration) and a passive RC low pass for adding a pole. I tried various Gain (3,5 , 5 ,8) on a breadboard and...
  14. L

    2khz noise

    short-circuit replacing them with a wire, that is putting in parallel to a wire as if there weren't? Can you make a picture of what do you mean ? THX! The waveform: I'am gonna to analyze it this afternoon! I'll post it !
  15. L

    2khz noise

    sorry , I made mistake. I use op4177 : http://www.analog.com/static/imported-files/data_sheets/OP1177_2177_4177.pdf and the output is send to pc by a national Instrument usb-6009 . With battery mode the 2 khz is lower but doesn't disappear.
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