These two circuits will streak a LED brilliant and devour under 2mA normal current.
Both circuits can utilize a transistor with a bigger current ability for the second transistor. The primary circuit needs a PNP transistor and the second circuit needs a NPN transistor if various LEDs should be driven. The second circuit is the premise for a straightforward engine speed control.
See the note on how the 330k functions, in Flashing Two LEDs beneath.
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