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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

    Hi

    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.

    http://www.highlandtechnology.com/Pages/psprod.html

    http://www.thinksrs.com/products/DG535.htm

    http://www.berkeleynucleonics.com/products/model-505-565.html

    http://www.quantumcomposers.com/cgi-bin/quantumcomposers/index.html

    http://www.signalrecovery.com/9650a.htm

    John
     
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