# Question: What Resistor Do I Need To Drop 12v To 3v?

## What resistor do I need to drop 12v to 5v?

PLace two resistors in series with the 2nd resistor value (5/7) of the first resistor value.

Place the resistors between 12v and ground and then you will get 5v at the point between them.

This is a very crude way of doing it.

It is unregulated so the voltage out will be dependent of voltage in..

## What resistor do I need to drop 12v to 9v?

12v to 9v converter using zener diode: The load must be connected to the output end to prevent zener from getting damaged. Series resistor 10 ohm is a current limiting resistor and when high current is drawn it has to pass that current through it, thus 5-watt resistor is necessary.

## What resistor do I need to drop 9v to 5v?

9v to 5v converter using a voltage divider: Components required: One 9v battery, 1.5k resistor, 1.2k resistor, some multicolor connecting wires.

## How do I reduce 5v to 1.5 V?

In voltage divider circuit you want to drop 3.8V across R1 to get Vout = 1.5V. This can be done by n number of combinations of R1 & R2 values. For e.g. you can use R1=3.8K and R2=1.2K or R1=3.8Ω and R2= 1.2Ω.

## What resistor do I need to drop 5v to 3v?

So back to our circuit, if we have 5 volts and want 3V from it, we use the formula above. If we use a 10KΩ as our R1 resistor, plugging in the values, we get R2= (V)(R1)/(VIN – V)= (3V)(10KΩ)/(5V – 3V)= 15KΩ. So we can use a 15KΩ resistor as our R2 resistor with the R1 resistor being 10KΩ. Let’s do one more example.

## How do you convert 12v to 3v?

Putting four resistors in serial and connecting it with 12V power source. Taking voltage only from one resistor; thereby achieving 1/4 of power source from it. take a 12v 4ohms potentiometer where the pointer will be adjusted at 3 ohms so that the voltage at last 1 ohm will be 3v.

## How do I reduce 12v to 5v?

Convert 12V DC to 5V DCStep 1: Take All Components As Shown Below and in Pictures. Components required – … Step 2: Connect Input Power Supply. 7805 voltage regulator contain three pins.In which we have to give power supply on pin-1 and pin-2. … Step 3: Output Power Supply. … Step 4: Wiring Is Completed. … Step 5: Checking.

## How do I convert 7805 to 12v to 5v?

PROCEDURE:Let’s have a look at the pin configuration of 7805 IC.Connect the 7805 IC in the Veroboard.Now connect 470uf and one 0.1uf capacitor parallelly with pin 1,2.Now similarly connect 220uf, 0.1uf capacitor parallay with pin 2,3 as connected in the diagram below.

## What resistor do I need for 3v led?

Basics: Picking Resistors for LEDsPower Supply VoltageLED ColorResistor (calculated)3 VRed, Yellow, or Yellow-Green48 Ω4.5 VRed, Yellow, or Yellow-Green36 Ω4.5 VBlue, Green, White, or UV48 Ω5 VBlue, Green, White, or UV68 Ω4 more rows•Aug 29, 2012

## How do I convert 12v to 9v?

In this, you can convert 12v to 9v converter for making projects of 9v Rechargeable batteries and so on. Steps to Connect: Connect 12v +ve voltage to 7809 Vin pin and -ve to 7809 GND pin. You will get the output of 9v at Vout pin.

## Can I use 12v for 5v?

It is Ohm’s law. Your device is R and 12/5V is V. Current is decided by Ohms law, I=V/R. With 12V your device will draw double the current and gets heated up because all current limiting values of your device are calculated for 5V source.

## What happens if you don’t use a resistor with an LED?

If you don’t put a resistor in series with the LED and you apply power, the current through the LED will exceed its rating and it will be destroyed. You can use the following equation to solve for R. Vdiode is the diode’s forward turn on voltage.

## Do I need a resistor for a 12v LED?

Let’s assume 20mA, though most LEDs will light more than adequately with much less than this. So now the mathematical bit. You give too little information for a definitive answer. If this is a “12V” LED, which generally will consist of several LED chips in combination, no resistor is required.

## Do I need a resistor for each LED?

The simplest circuit to power an LED is a voltage source with a resistor and an LED in series. … The ballast resistor is used to limit the current through the LED and to prevent that it burns. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

## What resistor do I need to drop 9v to 3v?

One option is a 330-ohm resistor. Using Ohm’s Law, the maximum zener current I is (Vin – Vout)/R = (9 V – 3.3 V)/330 ohm = .

## How do I convert 12v to 6v?

It’s possible to step 12 volts down to 6 volts by incorporating a pair of 10,000-ohm resistors into the circuit. Cut two lengths of wire, and strip each wire of 1/2 inch of insulation at each end. Attach one end of the first wire to the positive terminal on the power supply.

## How do you reduce voltage from 12v to 5v with a resistor?

Connect 12 v to pin 1 ,pin 2 is the ground and pin3 gives 5v. Don’t want to use IC or not getting it,use a voltage divider using 2 resistors and you are done with it. Connect 12 v across the series combination of 4.7k ohm and 6.8k ohm(readily available standard ) resistor and take the output across 4.7k ohm.

## How do you reduce voltage drop?

The simplest way to reduce voltage drop is to increase the diameter of the conductor between the source and the load, which lowers the overall resistance. In power distribution systems, a given amount of power can be transmitted with less voltage drop if a higher voltage is used.

## Do resistors reduce voltage?

Absolutely! A resistor is about to reduce the current and voltage. For example, when the current flows through the resistor, it will always generate a voltage drop, and which is mainly reflected in the decrease of the output current and the voltage.

## How do you convert 12v DC to 4v DC?

Two ways to reduce a 12-volt system to 4 volts are to use voltage dividers or Zener diodes. Voltage dividers are made from resistors placed in series. The input voltage is divided into an output that depends on the value of the resistors used.

## How do you reduce voltage from 19v to 12v?

The simplest way is a 12 v battery and a resistor from its positive terminal to the 19 v positive supply. Connect the load accross the battery. And the other terminal of the 19 v to the other terminal of the battery… .