Thanks for all the info

Sep 25, 2012 1 Replies
I

Just to claify I realise that the final circuit will require two timers. A slow (555 type) for the 2Hz and some means of deriving the



10-250nS pulse from the rising edge. The Schmitt trigger folowed by a number of gates to define the pulse width sounds good. I'll try this tomorrow. Thanks again for all your help. P.S This is to trigger a photon counter where the cycle time (2Hz) is not critical but the trigger pulse integrety is vital.
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B

There is one programmable delay generator around that would lend itself to this kind of job.

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It's only good for a delay range from 2 to 12n nsec per device, but it is a delay line, so you could put the same edge through the same part up to twenty-one times to get your 250nsec. The design would be messy. Two parts in succession might make it easier to fit something around a programmable counter.

It's just "a number of gates" built into one device, but it's been designed and specified for this specific job.

-- Bill Sloman, Nijmegen

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