How do you select a voltage divider resistor?

How do you select a voltage divider resistor?

Choosing a resistor value The value of the resistor R determines the range (maximum and minimum values) of the output voltage Vo. For best results you need Vo to have a large range and this is achieved if R is much larger than the sensor’s minimum resistance but much smaller than its maximum resistance.

How do you divide DC voltage?

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. At this point where the jumper wire is placed, the voltage will be one-half the value of the voltage supplying the circuit. The 5V is now 2.5V. VCC is split in half.

What size resistor do I need to reduce voltage?

The short answer is “don’t do that.” The voltage dropped by a resistor is given by Ohm’s Law: V = I R. So if you know exactly how much current your device will draw, you could choose a resistor to drop exactly 7.5 V, and leave 4.5 V for your device, when that current is run through it.

What resistor do I need to drop 12V to 5V?

Level Shifters

Resistor Combination	Use
4.7 kΩ and 6.8 kΩ	12V to 5V
4.7 kΩ and 3.9 kΩ	9V to 5V
3.6 kΩ and 9.1 kΩ	12V to 3.3V
3.3 kΩ and 5.7 kΩ	9V to 3.3V

How do I convert 12V to 5V?

12v to 5v converter using a voltage divider: You can run two LEDs in series across the resistor R2 while taking input from 12V lead-acid battery or a 12v adaptor as an input. Components required: One 12v battery, 1.8k resistor, 1.3k resistor, connecting wires. This circuit is a voltage divider schematic.

Can I use 12V for 5V?

The device will very likely burn out. In addition, depending on what the device is and the capacity of the 12V supply, connecting a 12V supply to a device rated 5V max could lead to a hazard – fire, explosion, etc. Mostly it will get damaged.

What is the difference between 5V and 12V?

Re: 5V and 12V RGB Dumb strings As far as light output there is essentially no difference. The big difference is the current that each of the 2 types draw. 5V strings or strips have individual leds running off 5V. Therefore every led draws 20mA with about 3V (very roughly) across each led.

What happens if I use the wrong voltage adapter?

Voltage too high – If the adapter has a higher voltage, but the current is the same, then the device will likely shut itself off when it detects an overvoltage. The device could power on and just draw more current from the adapter than it’s designed for. This could cause the adapter to overheat or fail.

How do I convert 9V to 5V?

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 convert a 12V to 9V resistor?

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.

How do I reduce 5V to 1.5 V?

This is a USB 5V to 1.5V/3V Step-Down Converter Circuit. It is used instead of a normal AA battery. In the circuit, we use LM317 DC voltage Regulator. To reduce the 5V input voltage from USB Port to the 1.5V at 1.5A maximum output.

How do you go from 12V to 3V?

12v to 3v Voltage Regulator

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

What resistor do I need for 12V LED?

Originally Answered: In order to light an LED with a 12V, what resistor value is needed? LEDs are forward biased for light emitting, In forward bias the resistance value will be less. typically 10 Ohms to maximum 100 0hms. For safe calculation you may take 50 ohms.

Do resistors reduce voltage?

A resistor has the ability to reduce voltage and current when used in a circuit. The main function of a resistor is to limit current flow. Ohm’s law tells us that an increase in a resistors value will see a decrease in current.

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 I reduce 12V to 15v?

To drop from 15v to 12V at 5amps , that is drop 3volts at 5amps requires a 0.6R resistor, rated at LEAST 15Watts. To be sure it didnt get overheated I would use a 25Watt or higher resistor.

How do you convert 12V DC to 3V DC?

A 12V DC input is received at the input. This DC input goes through smoothing capacitor C1 (1000uF) to remove any residual noise. The DC signal then goes through a Zener diode producing a regulated 3V. Here, the BD139 transistor increases the output current of the circuit to operate high current devices.

How do you convert 5V dc to 3.3 DC?

You can use any 3 resistors with same value connected in series to 5V and take voltage from 2 of them. So it will be 2/3 from 5V = 3.333V – very close to 3.3V.

How do you convert a 9v battery to a 3.3 V DC?

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 3.3 V?

Step-down level shifters A simple resistive downshifter. 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 you convert a transistor 5V to 12v?

An open-collector output and a pull-up resistor should convert 5V signal to 12V. You can use an NPN transistor (and base resistor) to change your output to an open-collector output.

What is XL6009?

The XL6009 is a Buck-Boost switching Regulator, meaning it takes in an Input Voltage and then switches it to produce a regulated output voltage which could be greater or lesser than the Input Voltage.

How do I get 3.3 V?

You can buy a couple of diodes and connect them in series to get the 3.3V from 5V. Every diode will have some voltage drop. you have to choose them accordingly so that the voltage drops add up to the 1.7V (5 -3.3 = 1.7V). This method can give you around 3.3V.

How do I reduce 5V to 3.7 V?

To convert 5 v to 3.7 v at fixed load ,we just have to add a fixed series resistor. 5 to 3.7 that means our series resistor have to create 1.3 v drop across it. For load 0.5A , R= 2.6Ohms and power rating is 0.65W. Idea of using zener diode is good with small series resistor.

Can I use 4.5 V instead of 5V?

If the current draw was less, the voltage would be higher. So your 4.5 VDC supply might be that at 1.6A, but at 1 A, it might be 5 volts. They’re very stable on the output voltage and can kick out an amp or so. It’ll work fine.

Are all USB ports the same voltage?

All USB cords carry the same 5V, regardless of if it’s got a 30-pin head or a microUSB plug, whether it’s first-party or third. That means DC chargers are now brand agnostic; if the volts, amps, and connectors are compatible, an Apple wall wart can charge an HTC just as easily as a Samsung.

Can I use a 5V charger with a 3.7 V battery?

Generally, a 3.7V lithium battery needs an overcharge and overdischarge protection circuit board. Lithium battery with protection circuit board can be charged with 5V voltage(4.8V to 5.2V can be used). For 3.7V lithium batteries, the charge cut-off voltage is 4.2V and the discharge cut-off voltage is 3.0V.

Can I charge a 4.2 V battery with a 5V charger?

In an emergency you can use a 5V source to charge a 4.2V battery IF you know what you are doing and are able to ensure the battery specifications are adhered to. If Vbattery is under 3.0 V (which it NEVER should be) charge at no more than C/10 (eg for a 1000 mAh cell) until Vbattery rises to >= 3.0V.

What happens if you charge a battery with too much voltage?

Reaching the voltage limit, the battery saturates; the current drops until the battery can no longer accept further charge and the fast charge terminates.

Can I charge a 3.7 V battery with a 4.2 V charger?

You must never charge any 3.7V lithium ion battery using a fixed voltage 4.2V charger. Although this voltage is appropriate for the last part of the charge, if applied when the existing charge percentage is low then it is very likely to create excess current.