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Help with electron microscope blanker circuit.

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
--
 
J

John Larkin

Jan 1, 1970
0
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

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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