Help with electron microscope blanker circuit.
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||
|
Posted by me@hotmail.com on February 13, 2007, 5:06 am
Please log in for more thread options 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 -- ---------------------------------------------- Posted with NewsLeecher v3.0 Final * Binary Usenet Leeching Made Easy * http://www.newsleecher.com/?usenet ---------------------------------------------- | |||||||||||||
|
Posted by John Larkin on February 13, 2007, 10:01 am
Please log in for more thread options On Tue, 13 Feb 2007 10:06:26 -0000, Moomanchoo (me@hotmail.com) wrote: >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 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 | |||||||||||||
>
>I have recently fitted an electron microscope with an beam blanker. To cut a