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https://wiki.brickrknowledge.eu/content/uploads/2016/06/9_3_2-1024x1024.jpg10241024The darlington circuit increased by an additional transistor, so that the gain achieved is now in total about 1,000,000 times. That is so high, that the AC current through the capacitor is sufcient to let the red LED light up. We have already used the capacitor in DC circuits. When the capacitor has completed charging, […]