Electrical Switch (NOT gate)
The main point is to do away with mechanical switch. Let me explain.
After building the circuit , first apply power first to A and than B. When you apply power on A first, the output of A (Y1) will output power which will in turn power Y2. When Y2 is on, Y3 will not be on. Which means that at first , the LOAD will not have power.
Simple reminder. the line running from Y3 to the OFF circuit is an intersection of the line which if from the LOAD to the ON or Y4 section .
So when you apply voltage to to Y4 (apply power once and release. Don't gave it power constantly ), This will cancel power to Y1 and hence Y2 will not have power which means that Y3 will output power , which in turn powers the LOAD. Due to the joint. Power will still flow back to the ON or Y4 section , meaning that Y4 will still have power which means that Y1 is off or 0.
So when you apply voltage to to Y5 or OFF (apply power once and release. Don't gave it power constantly ), this will cancel out power on line Y3 and on Y4 or ON. When ON has no power, this means that Y1 will have power and the chain continues.
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