How do you convert 9V dc to 5v DC?

A 9v to 5v voltage regulator can be implemented with an LM7805 step-down voltage converter. It is used for (10mA to 1 Amp and more) medium to the high current application. The unique about this circuit is its ability to provide the same output current as applied at the input end.

How do you reduce 12V DC to 9V DC?

To reduce a 12V circuit to 9V, place two resistors in series within the circuit. Find the difference between the two voltages (12V – 9V = 3V) to determine the total amount of resistance needed.

Can I use 9V battery for NodeMCU?

The output from the Voltage regulator is connected to the Vin pin of NodeMCU & GND is connected to GND. Hence you can power up the module using 9V/12V DC Adapter or by 9V Battery. On the other hand, if you don’t want to power up the NodeMCU using DC Adapter, you can use 3.7V Lithium-Ion or Lithium Polymer Battery.

How do you reduce the voltage of a battery?

Sometimes, your electronics project might just need a voltage source that’s lower than the battery voltage you have available. When this happens, you can reduce your battery’s voltage to any level you want by building a simple circuit called a voltage divider.

How do you step down 12V to 9V?

Can I use diode to reduce voltage?

Diodes allow electricity to flow in only one direction, but a diode will only conduct electricity, when the supply reaches its threshold. The threshold for common silicon diodes is 0.6 volts. After each diode, the voltage can be seen to drop by 0.6 volts. In this way, diodes can be used to reduce voltage, in a circuit.

What is the best way to convert 12V to 3V?

Depends on how efficiently and accurately you want to do it. A 9V zener diode in series with 12V drops it to 3V. A resistor will do it if the current is constant but both with 25\% efficiency and poor accuracy. A linear regulator has the same poor efficiency but very good accuracy.

How many resistors do I need for a 3 volt divider?

The resistors need to reduce the voltage by one third, so let’s say your divider uses a grand total of three 1 ohm resistors. Put the three in series, after the first resistor, the circuit that needs three volts can “tap” in there.

How to add 3 ohms to a 3 volt circuit?

Put the three in series, after the first resistor, the circuit that needs three volts can “tap” in there. The other two ohms will lead to ground. And there is your three ohms. You can use any size of resistors so long as they are able to give you a “thirding” effect, such as 1 5 ohm and 1 10 ohm.

How do you calculate the current of a 3V load?

For example, if you have a 3V 1Watt constant load, then (from Power = Volts squared / Resistance or R=V2/P) this is equivalent to a 9Ohm Resistance, and from Ohms Law (I = V/R) , the current draw is 1/3 of an Amp. So, you need to drop 12–3=9V across a new source resistor to make sure you have 3V to your load. You then use Ohms law again (