 # Quick Answer: What Resistor Do I Need To Drop 5v To 3v?

## Can I use 12v for 5v?

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.

Most TTL ICs which are rated for 5V have a max acceptable voltage limit at 7V..

## Does a diode reduce voltage?

Of course the effect may be negligible in a high voltage circuit but will have a measurable effect if using say 12V. Each diode in series imposes a voltage drop of at least 0.6V. This volt drop in effect reduces the applied voltage and as current is directly proportional to voltage, down it goes.

## 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.

## What resistor do I need to drop 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 convert 7805 to 12v to 5v?

12V battery to 5V 1.5A DC converter I use the 7805 power supply with the 12V battery. To reduce the constant voltage of 5 volts. Testing pure IC-7805 not over 1A current. It requires a transistor to increase the output current up.

## Will 5v trigger a 12v relay?

Is it a lighted switch. There is no other reason for the voltage being cut down by the switch other than you having it wired through the lamp in the switch.

## How do you convert a transistor 12v to 5v?

Steps to Connect:Connect 3.3v GPIO pin to 1k Resistor.Other end of 1k Resistor connect to 2N3904 Transistor(Base)2N3904 Transistor (Emitter) is connected to Ground.2N3904 Transistor (Collector) connect to one end of Multimeter.5v +ve supply connect to other end of Multimeter.5v -ve supply connect to ground.

## 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.

## Can I use a 5v power supply on a 9v?

No! It might work for few minutes, but eventually the voltage drop on the internal regulator will cause the circuit to overheat and burn. It could be however, that your adapter has an internal resistance causing the voltage to drop to ~5V, so it could work in this case, if the adapter can supply the needed current…

## 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.

## 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 is the difference between 5v and 12v?

I know that 12v can run longer distances, but will use a lot of power. While the 5v will use less power, but will be limmited to shorter distances. The voltage doesn’t imply power. 1 amp of current at 12v uses 12 watts of power, yet 3 amps at 5v uses 15 watts of power.

## What happens if you plug a 12v into a 9v?

In most cases, you cannot use a 12V adapter to power a 9V guitar pedal. Using a 12V adapter on a pedal designed to only handle 9V can completely destroy it. … Voltage is only one part of the picture and even if you get the voltage right, it’s possible for a power supply to ruin your pedal.

## Do I need a resistor for LED?

Resistors in Light Emitting Diode (LED) Circuits An LED (Light Emitting Diode) emits light when an electric current passes through it. … 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.

## How do I reduce 9v to 5v?

This is the circuit used to convert 9V to 5V in such cases. IC7805 is a series voltage regulator IC which gives you a fixed voltage of 5V at output with maximum of 1A current in TO-220 package (commonly given) and upto 2A in TO-3 package with adequate heat-sinks!

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

12v to 3v Voltage RegulatorStep 1: Material Requires. … Step 2: Schematic. … Step 3: Practical Aproach. … Frome same hole connects one end of 330-ohm resistance and another end to the ground. … Connect 12v supply. … From the junction of both resistor connect one 3v LED. … To verify Connect multimeter to the junction and measure the output voltage.More items…

## What resistor do I need to reduce voltage?

To reduce voltage in half, we simply form a voltage divider circuit between 2 resistors of equal value (for example, 2 10KΩ) resistors. To divide voltage in half, all you must do is place any 2 resistors of equal value in series and then place a jumper wire in between the resistors.

## 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

## Can I plug a 5v into a 12v RGB?

Without question the 2 versions of RGB are not interchangeable and do not work together. Plugging 5v circuit into 12v header may cause damage to the product you are plugging in.

## How do you reduce voltage from 5v to 3v?

The simplest possible step-down circuit is a resistive divider. Drive your 5V output into a chain of resistors, from which you tap your 3.3V logic input. A chain consisting of a 2.2k and a 3.3k resistor should produce a 3V output from an applied 5V input.