Re: BRY39 - Solid state switch's.
They are good devices, easy to use as timers. Better than UJT's in my opinion, as the intrinsic stand-off ratio (fixed by manufacture for a UJT, and not particularly consistent from sample to sample) is programmable by a couple of resistors.
However, I reckon that they were obsoleted by the 555 timer, which is the natural go-to component for most people. More 'legs' but more versatile, negligible temperature drift, and totem-pole output!
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