Discrete LM3909: Blue LED

As soon as once more, the discrete LM3909 circuitry can blink a (*(*15*)*)blue LED whilst working a couple of alkaline cells all of the approach right down to about 1 V, with one mobile finishing at 0.(*15*) V and the opposite at 0.8 V. They began out discharged to 1.(*15*) V every throughout their helpful existence, then blinked for a month; it’s as just right a use for useless cells as I will be able to bring to mind.

With every other pair of not-dead-yet cells offering (*15*).4 V, it began up once more:

Blue LM3909 (*15*).4V alkaline – 042

That’s a body from a brief video taken in subdued gentle, simply to turn it actually does paintings.