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Type: Posts; User: hakeen

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  1. Closed: Re: Converting bipolar differential signal to unipolar single ended signal

    Hi Barry

    thanks for quick answer.

    When I put my - output to GND, I lose half of voltage my range, that is my accuracy/resolution will be much less.
    An external opmap circuitry would be nice...
  2. Closed: Converting bipolar differential signal to unipolar single ended signal

    Hello

    for a current measurement circuit I use ACPL-C79x type of isolation amplifier.
    The input is +-300mV ( so below the ground). The isolated output is differential and the gain is about 8.2....
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    Closed: Re: IRS-B210ST01 PIR sensor

    Hi Savage67,

    it was some time ago, have learnt some about these sensors. I hope I remember correctly.

    firstly 500K,1Hz,1Hz means an object with color temp of 500K, at 1 Hz center-frequency...
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    Closed: Re: Layer Stack for best EMC

    Hi Inka,


    The both are OK from my humble opinion. PWR/GNDs at outside layer are always the best for shielding purposes, but reworking of board would be be very difficult in this case. For...
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    Closed: Re: Need info on Bond Pads and Bumps

    Hi

    to be honest i mnot an advanced designerfor your questions.
    I believe If you are designing an Flip Chip making IO pin and bond pad can share thesame LBs/coincide with each other. However for...
  6. Closed: Re: programmable output using silicon labs Si8250

    Hi

    you can use si8250 for 36V systems.However you should not exceed abs max values of the device.

    App note AN259 in website explains design of 30-72V systems.Max efficiency is given as 86%.
    ...
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    Closed: Re: Problem finding a FSI-150 series Connector

    Hi

    FSI connector has no counter co.nnector to mate with. it touches tospecial designed PCB pads which are done to touch to FSI.Thus FSI is prefrred for systems with not big mechanical stress like...
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    Closed: Re: Need info on Bond Pads and Bumps

    Hi

    Bump (a dangerous word in English :-)) s put on bond-pad before making the bonding. A clumsy analogy is:
    Think a soft concrete ball (bump) on a small proper floor(bond pad). In this ball a...
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    Closed: Re: Channel estimation in OFDM tutorial needed.

    Hello Mazdaspring,

    there is an app note from Freescale. Actually it was from Motorola, so I guess at least for beginning it can help :-)
    Then thing is in any paper about this topic reader can not...
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    Closed: Re: about transistor equivalent

    Hi Mk16820,

    after a quick check with some datasheets, it seems

    1) BF494 and BF199 are not drop-in (i.e. 100% compatible, at least in elec specs). Hfe and cut-off frequencies are different. The...
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    Closed: Re: Tv secondary output problem

    Hi Gasant,

    is the supply circuit getting hot? Can there be any short circuit just before LM7808?
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    Closed: Re: Tan and ArcTan calculation

    Hello

    thanks for good posts, but I am not math-master.
    Anyway, for solution two important things

    1)arctan x + arctan y = arctan ( (x+y)/(1-x*y))
    2)arctan(x) = -pi --> x=0

    so think it is...
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    Closed: Re: Diode transistor logic

    Hi Kishore680,

    yes it is possible, but the turn off speed of transistor will be much lower. A simple circuit is shown in below link. R4 should stay there, because it supplies Vbe and discharging...
  14. Closed: Re: Price for xenon flash lamp trigger transformer?

    Goedemorgen Grizedale, (I guess you re from NL)

    I am not sure, but most of the time supplier would advise customers to contact to distributors for pricing info. SUch info (especially for big...
  15. Closed: Re: why multiple input multiple out put use ofdm for data transmit

    Hi Piyushec7610,

    it is long time since I didnt study these systems, but as far as I can remember these MIMOs use the main advantages of OFDM: High throughput (i.e. performance) against multipaths...
  16. Closed: Re: where do i find dc jack in altium schematic library

    Hello Praya,

    i guess several manufacturer lib's (e.g. Molex) have typical jack types. They should be under these libraries. Maybe this link can help you.
    ...
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    Closed: Re: Tan and ArcTan calculation

    Hello Baby_1

    the answer is w=10000*sqrt(230).

    Hope helps.

    Cheers
  18. Closed: Re: Why 6cm^2 is given in power mosfet r_th tests?

    Thanks for help, Zeker.
    Yes I found out, it is JESD 51-3.

    Cheers
  19. Closed: Why 6cm^2 is given in power mosfet r_th tests?

    Hi

    In Power MOSFET Datasheets I see R_TH tests are done on a ~6cm2 copper layer on FR4 etc. From where 6cm^2 is coming? Is there a standart (lkike JEDEC) asking for it?

    Regards
    Hakeen
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    Closed: Re: Laptop SMPS grounding

    3 are for Line, neutral and earth. I guess two pins are line and neutral. With another words there is no earth. I dont know, but such connection is not allowed in certain countries (e.g EU).
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    Closed: Re: Avago Optocoupler Gate Drive HCLP-316J

    Hi

    I dont really get what you want to obntain from Vout. Whenever the PWM is input at primary side, the Vout will switchi accordingly. There might be some tolerance (PWD, PDD etc) but 316J will...
  22. Closed: Re: how to import data from excel files into SPICE?

    If it is regarding voltage values, then you can use a voltage source with file option. What kind of parameter do you want to change?
  23. Closed: Re: spi communication

    HOw and where did you connect 6N137? Is it possible to send extract of schematic?

    FYI. 6N137 is 5V compatible only.
  24. Closed: Re: Microcontrollers communication via opto-coupler

    Hi

    CNY17 is a phototransisotr output optocoupler. Theyoretically they can do up to few tens of kHz. But practically they will be around 5-10kHz range (depending forward current, pull-up resistor...
  25. Closed: Re: TLP250 OR BOOTSTRAP IC (IR2110 etc.) for MOSFET GATE DRI

    You cant use 48V for TLP250.H e can have abs max 35v, Recommended 30v. 48V is above both. I know some new generation optocouplers have abs max 40v,but even this one would be not enough. Woud it be...
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