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TI's OPAMPPRO,Lighning detection and an ADC

Discussion in 'Electronic Design' started by Douglas Eagleson, May 20, 2007.

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  1. I am trying to make a lightning detection circuit. And have a nice
    detector front and it needs to be matched to an ADC on a Zilog Z8
    encore mpu.

    The front end is +/-15Volts. And the ADC is a 0-3v affair.

    It works so good I am afraid to alter the detector main opamp. I was
    wondering if TI's OPAMPPRO computer design program would be useful in
    this endeavor.

    I am a novice trying to learn the Z8 and its ADC. I tried a 0-5 volt
    opamp- LM325 as the interface and lost alot of sensitivity.

    Any ideas.. Thanks in advance.

    I am investigating the rise time characteristics of the static Em
    field for a lightning bolt. IT might have some directionality?
    Aleviating the need for orthoganal magnetic coils to detect bolt
    direction?
     
  2. Rich Grise

    Rich Grise Guest

    I saw one of these about a millennium or so ago - they used two hula-hoop
    sized loops at 90 degrees to each other, to go to the X and Y axes of a
    'scope, and a third, vertical antenna, which went to the Z axis
    (intensity) input. The drawback was that the length of the trace was
    inversely proportional to the distance/power of the strike.

    Have Fun!
    Rich
     
  3. Thanks!

    I got the TI OPAMPPRO to spit out a diagram of the interface circuit.
    It matchs 0-15 volt to a 0-3 volt output.
     
  4. Yeah, all the various methods of handling the signal have been tried
    likely.

    I was going to use only the signal rise time to eliminate the long
    tail effect.

    Maybe I won't need the coils!
     
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