# Quick Answer: How Do You Reduce Voltage In A Circuit?

## 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 4.5 V instead of 5v?

Another thing to note: Most digital devices today that run off 5V feed that rail directly into a voltage regulator which drops it to 3.3V or lower. Those devices need the input voltage to be a little higher than the target voltage, so maybe 3.6-3.9V at a minimum. Bottom line, you should be fine with the 4.5V supply.

## How do you reduce AC voltage?

Re: How to Reduce low AC voltageObtain a transformer that converts 120 vac to 10 vac.Use a second transformer to convert 20 vac to 10 vac.Convert to DC and use an oscillator to generate 10 vac.Install a series resistor equal to the load impedance, so half the voltage is across the resistor and half across the load.More items…•

## How do I reduce 220v to 12v?

A step-down transformer would help you reduce your 220V AC to a more manageable 20V or 30V AC. Then you can use a rectifier to convert this AC to DC. Finally, use a voltage regulator such as the LM7812 to convert 20V DC to 12V DC.

## How do you regulate voltage?

DC voltage stabilizers Many simple DC power supplies regulate the voltage using either series or shunt regulators, but most apply a voltage reference using a shunt regulator such as a Zener diode, avalanche breakdown diode, or voltage regulator tube.

## How do I reduce 5v to 4.5 V?

Just put a silicon diode (e.g. 1N4001) in series with the laser supply, it will drop a fairly consistant 0.7v. Use two, if you want to be on the safe side. Just put a silicon diode (e.g. 1N4001) in series with the laser supply, it will drop a fairly consistant 0.7v. Use two, if you want to be on the safe side.

## 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… .

## How do you reduce 9 volts to 3 volts?

To reduce a 9V battery to 3.3 volts, use a zener diode, such as a 1N746 or a 1N4728A. Choose the appropriate one based on how much power it can dissipate. A 1N4728A has a 3.3-volt and a 1 W power rating. It can supply, on average, a stable 3.3 volts to a circuit or another component.

## How do I reduce 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.

## How do capacitors reduce voltage?

The conventional method is the use of a step-down transformer to reduce the 230 V AC to a desired level of low voltage AC. The most simple, space saving and low cost method is the use of a Voltage Dropping Capacitor in series with the phase line.

## How does voltage increase without current?

In order to change the voltage without changing the current, you must change the resistance a porportional amount. If the load resistance varies, you can use a constant current source to maintain the current level, as hgmjr implied.

## How do you reduce a 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 from 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 can you reduce voltage without current?

First, connecting them directly in parallel is not a good idea – if the voltages are imbalanced, they will not share the current evenly. Balancing resistors can help with this. To reduce the voltage down to 6, there’s a number of possibilities, depending upon how precise the voltage needs to be.

## 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!