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Help with electron microscope blanker circuit.

Discussion in 'Electronic Basics' started by [email protected], Feb 13, 2007.

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  1. Guest


    I have recently fitted an electron microscope with an beam blanker. To cut a long story short, I extract a 6 volt p2p sawtooth analogue
    signal from the microscope and feed it to a blanker controller which blanks the beam when the signal is greater than 5 volts. However I need
    more control over the timing and duration of the blanking for my experimental work. Can anyone help me out on a design for a circuit that
    would allow me to manipulate the amplitude and phase/delay of the saw signal? Importantly this needs to operate over a large range of
    frequencies. Or would it be simpler to convert the saw to digital signal and then manipulate it?

    regards Steve
  2. John  Larkin

    John Larkin Guest

    Ypu could use a proper comparator to do the ramp slicing, and feed the
    logic-level result to your blanker circuit.

    But if you can afford it, get a commercial digital delay generator,
    like the ones I make. Sometimes you can find an SRS 535 on ebay.

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