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Thread: One KeckedtoHurtz

  1. #1
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    Default One KeckedtoHurtz

    For Kecked, Clock for Lab Laser

    See attached.... 1 KHz precise clock, using TTL clock in a Can and a 74LS90 Decade Divider Chain. Your choice of optional output stages

    74LS00 makes a known 10 or more nanosecond pulse, the other uses a LM555 wired as a wide swinging buffer with 200 nS output...


    Steve
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    How does that make the pulse less the 50us long? So you are saying make the right side(divided clock) feed the left side of the drawings? The gate then shape the pulse and the 555 then shortens it?

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    That's a neat short pulse generator using the LS00 Steve; I like that.

  4. #4
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    Kecked,

    The edge from the 74LS00 Circuit forms a digital mono-stable, guaranteed less then the 50 uS you specified, it only fires on the positive edge from the last 74LS90. The 555 adds voltage swing and cable drive, while elongating the pulse to say 100-200 nS for an OLD LM555. Its easy to convert the 555 into an actual monostable using say LMC555 or a 74LS123 if you want a certain pulse length. Other 555s may be faster/slower.
    !
    Noblegas, the NAND trigger lockout and pulse shaping schematic is from a gentleman named R. Vanishree
    !
    Linky Thing:
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    http://electronicdesign.com/test-amp...out-555-timers
    !
    Steve
    Last edited by mixedgas; 10-11-2016 at 12:55.
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  5. #5
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    I'm really quite fond of using these old things or other delay generators for triggering lab lasers. The trick with 7010 is to only buy working ones... When I called BNC to say I was using a 7010, they were amazed that one was still in use. In fact they wanted a scope screen shot for posterity.
    !
    http://www.ebay.com/itm/BNC-DIGITAL-...EAAOSwAuZX3ITf
    !
    I'm even more fond of the Stanford Research DG535 too, but they are expensive, even used. Delay Generators are the standard way to do this in a lab...Especially if you need the leading edge of the laser pulse to be the start of a chain of events in the lab.
    !
    Steve
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