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I am stumped, what is the purpose of this device

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NiHaoMike:

--- Quote from: westfw on June 09, 2020, 10:15:08 pm ---There used to be a device called as LASCR - Light Activate Silicon Controlled Rectifier.  You could build a "Slave flash trigger" from an LASCR and a resistor, and it was a circuit that appeared in many hobbyist books and etc.  Most surplus stores and I think even Radio Shack sold them.  I see there are still tutorials on the web about these, but I haven't seen any for sale in a long time.  (And I never knew what their "original" application was, that allowed them to be sold "surplus."  It seems unlikely that "slave electronic flash trigger" was a big enough market, given that these things appeared well before electronic flashes were common...)

--- End quote ---
Those are still common as part of SSRs. There's just next to no demand for the optically triggered thryistor by itself.

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