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Jan 21, 2022 at 13:12 comment added Andy aka @henros I also assumed beta was 100 and, it might be more like 200 at the optimized collector current (maybe 10 mA) so, a few swings to the left are broadly countered by a few swings to the right and, maybe the LED has only 1 mA flowing. 1 mA is enough to make most LEDs look quite bright. The bottom line is that the hackaday circuit is pretty crappy hence why they use the term "hack" in their title.
Jan 21, 2022 at 12:40 comment added user131342 I agree completely with the conclusion, but doubt some of the calculation. Expecting a beta of 100 from a 2N2222 with a collector current of 1uA is at best optimistic - something like a 2N2484 might manage it.
Jan 21, 2022 at 12:20 history edited Andy aka CC BY-SA 4.0
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Jan 21, 2022 at 12:08 history answered Andy aka CC BY-SA 4.0