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What about introducing a 'pot', so one could vary/regulate the 'on-time', at will? I'm not thinking of this particular application, but rather, a "blinking' circuit. How would you determine the 'limits' (min. & max. range of pot); since, I'm assuming that not all LEDs are equal regarding how much applied power they can accept... before they 'fail' or become non-functional. I wish someone would contribute a schematic, with full explanation of how to make it 'blink' randomly, as well as, at consistent intervals. Also, how about having it run on a 9v battery? I'd buy them 'lunch'.
bklyn 40... He is 'suggesting' that you can omit, or "NOT use" the resistors.
wobbler... If Ilyanov's chosen C1 & R1 combo for this circuit yields a 15sec. 'on'-cycle... how would one calculate the necessary values of C1 & R1 (in a similar circuit / application) to yield an "on" time of, say, 1-min., for example? Or, 2-minutes... etc.? Is it as simple as raising the "values" by a factor of 4, or 8... to achieve those time-lengths? I'm a complete novice... but, very interested in these sorts of timing circuits.
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