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Sir, thanks very much, it helps a lot. I've made it, but having a confusion with its power supply, I've battery pack of 22.2 volts (I have an arduino and a solenoid to power up.) and would be using 7809 voltage regulator for straight 9 volts(POSITIVE). Now is it compulsory to have Negative 9 volts to the other power rail? If so, then what should I do? Other than the 7909 negative voltage regulator, because it is not available any where around. Kindly guide me, It'd help a lot.
Is there any replacement for Copper-foil?
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