Questions tagged [voltage-divider]

A voltage divider is a circuit that produces an output voltage that is proportional to the input voltage. One typical configuration consists of a pair of resistors in series from the input voltage to ground, with the output voltage taken from the junction of the resistors. As an example two equal valued resistors will give an output voltage 50% of the input.

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What will this OP_AMP output if it's VCC is off?

I have a board with this voltage divider and follower, for all my ADC channels I can use, as shown in the pic attached. Ignore top LHS / ANA_IN1. With J14 on, VCC_OPAMP on, all works as expected - ...
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Why does my voltage divider output seem to vary depending on the order of magnitude of overall resistance?

I'm working on a project where I want an Arduino Uno to measure the voltage of a 12V lead acid battery. The Uno's analogue read pins can't handle raw 12V, so I need to use a voltage divider with ...
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How to calculate voltage of these nodes

How exactly does one calculate the voltage of the marked nodes and arrive at the numbers in the picture (1.75 and 1.628)? I fail when trying. :( simulate this circuit – Schematic created using ...
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265 views

Why is my linear pot is causing a non-linear voltage at my ADC input?

So I have a socket that connects an expression pedal to a simple input circuit that feeds a voltage to an ADC chip that I then read from a Raspberry PI. I've checked the resistance on the expression ...
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How do I connect 24v NPN/PNP device to a Raspberry Pi GPIO without cooking the Pi?

As part of my "detecting the presence of an item on a conveyor" I'm looking at industrial through beam connectors. A lot of them are 3 wire NPN or PNP devices like this (highlighted): I'm wondering ...
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Why we need two resistors to control the gate voltage of a PUT transistor?

Looking the follow schematics you can see two resistors 15k and 27k that are controlling the gate voltage of the PUT (programmable unijunction transistor) transistor. My question is why we need two ...
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potentiometer as voltage divider and taper

assuming that I'm going to change the potentiometer value (now is 50K linear) to 100K linear, should I also change the value for R1 and R2 in order to keep the same taper and the same power ...
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A simple voltage divider problem

I came across a rather simple looking circuit of a voltage divider circuit. It has 5V at one terminal and 0V at the other terminal. Let's start by connecting two 1K resistors in series between these ...
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Derivation needed

I am using a chip that has the following circuit in it where V_in is inputted on the left and V_out is measured on the right. This circuit is sometimes called the "lumped-element delay lines." I was ...
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How can I connect a 24v-powered inductive proximity sensor to a 3D printer control board?

I am attempting to connect an inductive proximity sensor to my 3D printer. The sensor I'm using is a Zhongde PL-08N2 sensor, which is an NPN output NC (Normally Closed) sensor. As I understand it, ...
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Calculate measurement accuracy of voltage divider with suppressor diode?

I have a voltage divider to measure the voltage in a DC Bus. I parallel to R1 I have a suppressor diode (D1) to protect the input of the microcontroller from transient overvoltages. This diode has a ...
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Finding Node Voltage

I need to find node voltage at A. This seems like a trivial question, but when I set up the resistive voltage divider equations they are not equal to each other. Am I doing something wrong? My ...
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ADC protection best practice

Say you were wanting to measure a signal with a higher voltage than the ADC could handle. Is there some best practice or commonly used circuitry that goes beyond a simple voltage divider to protect ...
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Simple Transistor Resistor Amplifier Circuit Question

Can Someone Please Help Me On Solving this. I have tried and stuck..In a point that can I apply Kirchhoff's Voltage Law around R2,R4 loop. simulate this circuit – Schematic created using ...
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Controlled Temperature Coefficient of chip resistor

I am designing and experimenting with current source circuit using Op amp and transistor. As output current increases, the temperature rises which then makes the output current value to change for ...
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Is the voltage divider in this circuit backwards for what I'm attempting to achieve?

This circuit is from another post (from long ago) where a user helped me build a circuit which would use a BJT as a switch. simulate this circuit – Schematic created using CircuitLab The ...
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Voltage divider getting HOT!

The scenario went like this: I used to run this amp with +-20v DC, and it seemed to work fine except for a little bit of clipping. Now, I changed my mind to make it work with bigger voltage!!! I've ...
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What is the difference between a potential divider and a potentiometer?

It would be nice if I could get an elaborate answer which highlights the difference between their functional aspects.
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How is the voltage divider formula being applied in this example?

I have this example of how to resolve a Thevenin tension using the voltage divider formula. I understand where the first part comes from, but I don't know how to get Vx and why the first part has ...
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0-5V Audio Signal with TL082

I am working on an Arduino project that requires me to be able to handle audio input from a 1/4" input jack, and it needs to be powered with just one 9V DC input. Since the Arduino cannot process ...
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Fine, coarse adjustment digitally

I want to add fine and coarse adjustment to a power supply for both voltage and current control, for fine tuning I'll need four potentiometers either 10 turn or regular ones. I was thinking to trim ...
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ADC reference voltage for nRF52840

I have designed an voltage divider bias with thermistor and the output voltage is given to adc pin of my nRF. But the internal reference voltage of my nRF is 3.6V so I did not get any accurate values ...
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Auto Scaling in a Multimeter

I’m trying to create a multimeter, I’ll be mainly using a 16 bit ADC (ADS1115), an ESP8266 on Node MCU, I’ll use the MCU to communicate with a phone app to switch between different multimeter modes, i....
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Superposition principle and voltage division

I am looking at some circuit solving using the superposition principle and I came across this one. We need to find \$v_0\$. My thought would be to use superposition and voltage division in the ...
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Optocoupler/isolater circuit for 24VDC sense that transfers switch status to 3.3VDC microcontroller

hope everyone is having a good couple weeks before Christmas, I was given this question for an assignment How would you use an opto-isolator to sense a switch status in a 24VDC machine control ...
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Confusion regarding voltage division

I am looking through some old exam problems and I came across one with a solution, I don't quite get. "In the circuit below what is the voltage drop across R3?" Their answer is zero, and they come ...
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Advice on a voltage measuring circuit

I've been working on a voltage divider circuit that will hopefully allow me to measure voltages between 0-60 kV DC (80 W) as 0-889 volts DC. The voltage divider section that is used to measure the ...
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Increase signal voltage before Raspberry Pi

Another newbie question. I want to send a signal to a raspberry pi zero but I don’t have enough “signal-power” I have a Adafruit Powerbooster 1000c. It basically takes power from a micro USB, a ...
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153 views

Circuit to know when two batteries are connected to each other

I'm using a Victron Cyrix (12V 120A) Smart battery combiner to connect the starter and the leisure battery in my RV. I wanted to know when the two batteries are connected to each other, but ...
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33 views

4-16V SSR control pin with 24V

I need to control 6 SSR inputs. These are 16Vmax rated on the control side. I need to use them with 24V control voltage out of a PCB which looks like has mosfets for output and all positives of the ...
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Signal Superposition and divider?

I am all out of MCU pins and would like to add a voltage sense function. This will only be necessary when the device first starts up. I have a somewhat sensitive signal already connected to my ADC, ...
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Using ESP8266 to read digital input pin to be notified when motion is detected from 24VDC source device

Software developer here, trying to mess around with hardware (VERY NOVICE) and implement neat things around the house using ESP8266s and Arduinos. I have a commercial wall plug that is activated when ...
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Why voltage regulators instead of voltage dividers for supplying power to loads? [duplicate]

I have to supply 80 Raspberry Pi's with power, so I began looking into it and found a power supply of 12V 20A (might not be enough current to supply 10 Pi's that typically draw 1.5A - 2A though). ...
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Resistor Divider Project

I have a question about a resistor divider circuit. PLease see my circuit below. I have to design 2 seperate circuits for the following 2 cases each with their specific requirements as shown. I am ...
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68 views

Rotary potentiometer angle to voltage relation

I have a 10k rotary potentiometer which turns from 0° to 270°. I wire it to an Arduino with the middle pin (2) connected to an analog input (A0) and the other two pins (1 and 3) connected to 5V and ...
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2answers
51 views

Separating power depending on voltage

I just started working on a computer science project that requires me to do some hardware stuff, but I am a complete noob most of it. For a part of the project I need to be able to forward a current ...
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Voltage divider resistor PN balancing

Refer the representational schematics for voltage sensing by ADC (SAR). I read somewhere to balance the P and N lines add R3 = R1||R2. How come R1 and R2 parallel combination could be considered as ...
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At what point should I switch between a resistor divider and a LDO?

My problem is that I have a RF chip which is supplied 3V3 and interfaces with my MCU over 1V8/2V8. I have an external source of 3V3 which will supply the RF chip. I'm space restrained on my PCB and ...
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Voltage divider reverse formula

I have this schematic, with an power supply of 24V and I want to read this voltage with my arduino so i need a voltage divider, the formula for voltage divider is Vout = (Vin * R2)/R1+R2, so with my ...
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What is the proper configuration for an adjustable voltage divider circuit

I am making a circuit that need a voltage reference that is adjustable. The the answer that many of us would think of is a voltage divider. There are 2 configurations that I thought this can be done,...
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Need help in designing a BJT Amplifier with Avnl = 100

For our final project, we need to design a "single-stage BJT-based highpass amplifier using voltage divider configuration". The amplifier has the following requirements: \$V_{CC} = 12V, f_L = 300 Hz, ...
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Differential Amplifier with voltage divider for reference voltage

I'm trying to convert a 0-5 V voltage generated by a DAC to a -10 to 10 V range by using an LM324N OpAmp in differential amplifier configuration. By choosing R1/R2 = R4/R3 = 4, I expect the output to ...
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LM2596, Voltage divider causes delay in voltage changes

simulate this circuit – Schematic created using CircuitLab In above diagram feeding 0-5V on inverting input of opamp will vary the output of LM2596, The problem is R1 is getting really hot at ...
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Did I do something here that could have damaged my Arduino Mega2560?

I built a simple project here with a Mega2560. I wired up a TEA5767 FM tuner module via I2C. I tapped into it's line out pins, did some DC biasing and connected it to analog inputs of the Arduino, ...
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71 views

Controlling LM2596 digitally

Below schematic is how I'm going to control the output of LM2596: simulate this circuit – Schematic created using CircuitLab I want the output of the LM2596 to be 3-15V and it does exactly ...
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23 views

Voltage at the load in matched transmission line

We have a source (Z_s) and load (Z_load) connected with a transmission line. It is known that the connection is matched, that means Z_s=Z_0 and Z_0=Z_load. If the voltage from source is 1V, what will ...
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Maximum Input voltage of the DSO shell oscilloscope and TL084

In jyetech forum FAQ they mentioned that DSO shell is capable of measuring up to 50V directly: DSO Shell was designed for low voltage measurement. The maximum input voltage was specified as 50Vpk ...
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The best way to bring drop 700VDC to 12VDC?

I am currently working on a PCB design that will be using 12VDC to power all of its components. It will be mounted on a vehicle, which is powered by an external power supply, which supplies the ...
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Fixing the Collector Current for a BJT amplifier

I am doing a design of a BJT amplifier with the voltage divider biasing. I am trying to set up my Q points in the DC analysis. Based on my notes from school and research online, I have set up the ...
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Stepping Down Logic Level of a Differential Signal

simulate this circuit – Schematic created using CircuitLab Suppose I have a unipolar, differential 24V signal, and I want to step it down for use with a 5V differential receiver (such as RS-422)...

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