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Type: Posts; User: dipnirvana

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    Closed: Surge rating at elevated temprature

    Hi i have very basic/fundamental question !

    We design product for CE certification . That includes surge requierment (IEC 61000-4-5). If we look at the standard it safecify pulse voltage , source...
  2. Closed: Turn on current requierment of IGBT /Mosfet

    Hi, all,

    i have doubt which i didn't had earlier :) . Any way for one of my application i need to design gate driver of IGBT IKW60N60H3 (data sheet attached) . Drain current is 30A, drain voltage...
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    Closed: Re: ADC bit calculation method

    Don't take values i put forward to real world values . i just took it illustrate the confusion . Actually the confusion there as some application note says that u only take DC error into the account...
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    Closed: ADC bit calculation method

    Hi i have very basic question t put forward ,

    Let say u want to measure a battery voltage which is 2.5 V with 1% error . The minimum voltage that battery can go is 0.1V.

    Now one way of...
  5. Closed: Safety issue in battery circuit and use of oscilloscope

    Hi , I have a little doubt ,

    I want to test my circuit which is powered with 12V, 200Ah battery(VRLA) and check the outputs on oscilloscope. While testing can I connect battery -ve to the...
  6. Closed: Re: how to determine i/p sensitivity of the receiver

    Senstivity will be defined by the receiver's ability to sucessfuly decode the coming signal. And that will be defined by the BER.

    hope this will helped
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    Closed: Re: WiFi and Zigbee hardware

    communication band is same but not the physical layer.
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    Closed: Current transformer suggestion

    This will depend on the turn ratio. u only need a "resistor" in the secondary of the CT.
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    Closed: Circuit repetition on a PCB ??

    may be use board-arry in altium
  10. Closed: Automated LCD, how to test and confirm all segments glow

    Hello all,

    i m not sure if it's the right forum . n way we have practical problem with the LCD testing.

    We have a segmented LCD of size 65mm x 60mm size with 288 segments (number and...
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    Closed: UC3844 based design

    Our Input specification of flyback smps is 60VAC to 300VAC and output is 5V at 200mA.

    Now to startup the UC3844B, bias current require is 0.5mA, so the startup resistor will be 100K. But at...
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    Closed: Power supply --cheapest way

    Input specification : 60VAC to 300VAC ,45Hz to 65Hz
    Output specification: 3.3V@0.3A, 5V@0.1A
    Standard : Safety and CISPER 22

    Wt do u think is the best and cheapest way to acheive it. One...
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    Closed: Re: slow rising ramp integrator opampp based

    Yes u r right , i am using ADC to sense the levels and than trigger the square wave.
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    Closed: slow rising ramp integrator opampp based

    thnaks.

    Ripple means , a big ~70mV change when i measure it with AC coupling in oscilliscope. What parameter make this swing ?
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    Closed: slow rising ramp integrator opampp based

    Please look at the circuit attached . I am feeding sq. wave to the opamp and expecting a triangular ramp signal at the output. I am getting it for sure , but i am also getting the ripple of ~70mV at...
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    Closed: Band-gap ref for ADC

    Thanks for replying.

    I am talking of voltage reference to ADC . Now i would be using 14bit of ADC. and as per my calculation 0.003% is the requierment of initial tolerance and less than 1ppm is...
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    Closed: Band-gap ref for ADC

    I have a micro which has band-gap reference of 1.2V . I am powering up the ADC with 3.3V and i want to give reference to my ADC around 3.3V.

    Do you think i can use band-gap ref. and use a...
  18. Closed: Large signal analysis

    use .trans analysis
  19. Closed: confused with op amps ... any tips how to study op amps?

    focus.ti.com/lit/an/slod006b/slod006b.pdf

    read this , will give enough to start with.

    All the best
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    Closed: Writing to external memory

    All are avilable on vendor site. Chk datasheet and application note
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    Closed: Clarification on ESD protection device

    it suppress
  22. Closed: linear regulator with 2n3055

    The reason is load regulation. the more current u draw from zener or TL431 u go away with the volatge u promise.
    But 74XX allow more current from them
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    Closed: snubber rcd

    I did calculated for flyback way back. i am attaching my matchcad file, just check in case it helps.

    sorry the document was in very non-descriptive. :D as i made it for me , only
  24. Closed: a question about PCB layout for 3-stage single chip PA

    Well my friend capacitor requierment comes from the current switching requierment of the particular IC. may be single 2.2uF enough for the application. But i would say if "a" is proposed by the...
  25. Closed: downlink frequency higher than uplink

    I agree with Vfone that FSL is not differing much even if u take extreme case of 800MHz(uplink) and 960MHz(downlink) than the difference is 98.07dB-96.48dB ~1.5dB it's nothing.

    But may be in...
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