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Photo Thyristor

Discussion in 'Electronic Design' started by Jim Thompson, May 7, 2009.

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  1. Jim Thompson

    Jim Thompson Guest

    Anyone have experience with photo thyristors?

    How well do they work? Cautions? Suggestions?

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona 85048 Skype: Contacts Only | |
    | Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
    | E-mail Icon at http://www.analog-innovations.com | 1962 |

    Buy a Fiarysler with your tax credit...
    Ignore that grinding noise, that is normal :)
     
  2. Andrew Holme

    Andrew Holme Guest

    I used KMOC3022 for switching in a home telephone exchange hobby project and
    they worked very well:

    http://www.holmea.demon.co.uk/Exchange/Schematics.htm
     
  3. Andrew Holme

    Andrew Holme Guest

  4. Used LASCRs *decades* ago.
    AFAIK, they're pretty much dead as individual components. They live on
    in some optocouplers.

    Cautions? As with all thyristors watch max dv/dt at high temperature
    and turn-off characteristics. Can't think of anything unusual. If it's
    a triac driver you probably want to be sure you don't drive it
    asymmetrically under any conditions 'cause that will put DC into the
    source and load-- in case those might be transformers or whatever.


    Best regards,
    Spehro Pefhany
     
  5. Oppie

    Oppie Guest

    I haven't seen one in ages. Do remember seeing a construction article in
    Popular Electronics (or was it EI?) using one to trigger a slave photoflash.
     
  6. whit3rd

    whit3rd Guest

    Like other SCRs, they turn off slow. Unlike other SCRs,
    they turn ON quite fast, because the active area of
    the photon reception can be as big as the SCR.
    Of all SCR types, these have the highest dI/dt limit.

    Big SCRs are available, but big photoSCRs might be
    hard to purchase... there are some export restrictions
    and suchlike involved.
     
  7. Jim Thompson

    Jim Thompson Guest

    I found a way to avoid needing them. See Nagle's LTspice inductor
    modeling thread (Model 15 Teletype hammer driver).

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona 85048 Skype: Contacts Only | |
    | Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
    | E-mail Icon at http://www.analog-innovations.com | 1962 |

    Stormy on the East Coast today... due to Bush's failed policies.
     
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