The quickest way is to use a serial resistor to bring down the voltage for 9v or 12v to around 5v.
12v to 5v voltage regulator.
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7805 voltage regulator contain three pins in which we have to give power supply on pin 1 and pin 2.
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One related scenario is bringing down 12v power source to a 5v device.
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Example experiment i use the 7805 power supply with the 12v battery.
In one situation a user wanted to use a 5v dc power digital voltmeter or ammeter.
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Which is a simple circuit using ic 7805 to the fixed regulator 5 volts and tip41 npn power transistor to increase current up to 2a.
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If we need to use 12v to 5v voltage regulator.
We have to connect ve input power supply to the 1st pin of the voltage regulator and ve input power supply to the 2nd pin of the voltage regulator as shown in the picture.
His power source could be either a 9v dry cell or use in 12v vehicle battery.
This is the 5v 1500ma dc regulator circuit.
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