This circuit consists of two NPN transistors. When one bulb is on the other is off, when the other bulb is on the first bulb is off. This is how this circuit is working.you can add up to 4 LED bulbs to one side and all together you can add 8 LED bulbs to this circuit. But keep this in your mind those bulbs should be in parallel and also remember this you should add equal amount of LED bulbs to the both sides.
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