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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 that is 50% of the input voltage.

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Not correct reading in ADCs DACs integrated system

I made a ADCs board (AD7194) and DACs board (AD5689). Each DAC (separated ground) could output 0-5V, and Each ADC channel could measure 0-3.3V. I used a voltage divider network to turn 0-5V to 0-3.3V. ...
Dar's user avatar
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LM5013 buck regulator won't have high duty cycles

I have made a PCB with the LM5013 buck regulator, but can't seem to get the output voltage high enough. The goal is to be able to adjust the output voltage using the LOAD_REGULATE pin, for a variable ...
leheim's user avatar
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What is the proper way to make a configurable split-supply voltage clamp with voltage dividers?

Being a beginner in electronics and not having had exposure to a lot of “best practices” I was trying to generalize the voltage clamp to arbitrary positive and negative clamping voltages. The ...
Matthias's user avatar
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Switching voltage divider and low pass filter combined

I have an input signal which I want to switch from 12V-5V and a low pass filter directly after that, the issue is, if there wasn't a switch I can calculate the cut-off frequency easily. In my case, ...
zoghii's user avatar
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3 answers
126 views

Calculating current through a diode in a voltage divider circuit

I have a voltage divider circuit which I use to drive two LEDs with different luminous intensity. I understand that this is not the best way to do it but I wanted to control two LEDs with the same ...
Nikhilesh's user avatar
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2 answers
62 views

Trimmer Potentiometer with Unexpected Voltage Range

I designed a voltage divider circuit using a trimmer potentiometer 3224J-1-103E for the first time. But, upon receiving the board, I found out that I was unable to tune the potentiometer across its ...
imthegman55's user avatar
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3 answers
84 views

How to analyze and simplify a voltage divider with a second voltage source?

How do I simplify the circuit below? simulate this circuit – Schematic created using CircuitLab I know that R2 and R3 form a voltage divider, but I can't figure out the input impedance that In ...
SRobertJames's user avatar
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Unknown use 20 V injection in KNX Digital input (read switch status) gvs 4fold

This is a circuit that I've recreated from gvs 4fold digital input. There is common and wire that goes to 4 switches (this circuit only shows 1 of them) when it it's closed the microcontroller reads ...
user8373848's user avatar
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3 answers
101 views

How to measure multiple resistances with Arduino Uno, without one measurement influencing the other?

I'm working on a project where I aim to measure resistances using an Arduino Uno. I started with two separate voltage dividers, each using a 1 MOhm reference resistor, connected to a common Arduino ...
Esat Becco's user avatar
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Understanding Voltage Read in Voltage Divider for NXP S32K118 Microcontroller ADC

I am having a bit of a hard time understanding the voltage read in the voltage divider that is being an input for an ADC to an NXP microcontroller, S32K118. Below is the schematic of the circuit. ...
Geisterfahrer's user avatar
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More current draw from a power supply based on a voltage divider

I've built a circuit that needs a power supply that can provide -12V, 5V and 12V. I've built the circuit below as a proof of concept, being aware that I might need to build something that allows for ...
Peter Lenkefi's user avatar
2 votes
1 answer
117 views

Beginner question regarding voltage divider for microcontroller

I am a beginner concerning electronics and would love to learn something new. I have a Teensy 4.1 and would like to calculate an encoder's speed. The encoder is built in into a system which supplies ...
homecockpits's user avatar
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1 answer
73 views

How to connect 3V dc motor to 5V power source? [closed]

I can't get a grasp of electro-engineering basics Given a DC motor 3V and 5.12V power supply from a phone charger I thought I can use voltage divider to divide 5.12V into 3V and 2.12V, seems logical <...
IC_'s user avatar
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Unusual but consistent variation in alternate sensor analog readings

I have designed some sensors that take readings of timber resistance between 2 screws with the idea to determine if the timber is getting wet from a leak. I have had a trial setup running with 6 ...
kyotee89's user avatar
4 votes
3 answers
2k views

Role of a resistor in a specific, simple circuit

i am currently reading "make:electronics" from Charles Platt. On page 129 in Figure 3-87 i found a circuit, which i have reconstructed in the following image: The circuit is supposed to do ...
balu's user avatar
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Why don't these resistors affect the gain in voltage divider bias?

Our textbook says that voltage gain is not affected by the R1 and R2 resistors, but I don't understand the reason behind it. Also, don't we get the 1/gm that is in the denominator from r(pi) resistor ...
nwnd's user avatar
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Fast high-voltage diode stack (for snubber circuit)

I have a specific application in mind, but a more general question regarding diode stacks. System overview: We have a constant-current source which is driving a constant current through a magnet. We ...
PulsePowerFTW's user avatar
1 vote
1 answer
90 views

Driving 5 and 3.3 V square wave from a single terminal

I'm quite new to the topic and for fun I'm building a low frequency square wave generator with parts I currently have. Overall it works just fine while built on a breadboard, however I would like to ...
Maxim Pavlov's user avatar
1 vote
1 answer
70 views

Help me on this voltage divider question

There is only description of the circuit and a question. In a voltage divider circuit powered by a 12V source, two resistors R₁ and R₂ are connected in series. An LED with a forward voltage drop of ...
Aron Hearth's user avatar
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Voltage divider network 12V / 24V option to UVLO pin of LED driver

I have a voltage divider network with R1 and R2 and another R2 in parellel but not connected to ground. I have a dip switch where turning it on changes to 24V so it adds the second R2 to ground. Can ...
Andy's user avatar
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2 answers
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Thermistor misreading

I'm currently working on a hotplate project with an ESP32, utilizing a 10k ohm NTC thermistor (B57550G1103F000) capable of measuring temperatures up to 300°C. However, I'm encountering issues with ...
Loic Daigle's user avatar
0 votes
2 answers
139 views

Superposition method to get the voltage

I want to know the voltage level at node E. Using superposition, I'm having a hard time calculating when 1 V and 2.5 mA go to 0. When 5 V meets 8 kΩ and 8 kΩ and 0.4 kΩ will be in parallel. I'm ...
weycdicdib's user avatar
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3 answers
74 views

Finding resistor values in a voltage divider circuit involving a zener diode

I want to use the TLC59212 latched driver. Recommended voltage supply is 4V min, 5.5V max. I understand that I can't use it on 3V. High level input is Vcc*0.7 Min. ...
Fredled's user avatar
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How to control 0-5V in 5 steps? (1V, 2V, 3V, 4V and 5V) [closed]

I want to change a 10k potentiometer that is connected as a voltage divider to a 5V supply. So, instead of a potentiometer, I need a way to divide that 5V supply into 5V steps (1V, 2V, 3V, 4V and 5V) ...
tibi10's user avatar
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1 answer
78 views

Why is a variable resistor (R101) used in this circuit?

This is from a brake system plausibility device for a Formula Student race car. I'm confused why a variable resistor is used in this case and why couldn't there be a regular resistor instead like the ...
Friezer's user avatar
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0 answers
18 views

External Hysteresis Resistive Divider for MAX 6777

I want to switch on power to an ESP32, when a capacitor reaches 4.8V, and turn off the power, when 3.3V are reached. In this question: Use supercapacitor to power microcontroller I was asked to better ...
KungPhoo's user avatar
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1 vote
1 answer
47 views

Voltage divider with filter cap gain derivation

I am a mechanical engineer by training and I'm self-studying circuits. I'm trying to understand how to derive the gain and cut-off frequency for the following circuit: I think that I should use the ...
nwsteg's user avatar
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1 answer
75 views

operational amplifiers, voltage divider

Could someone please tell me what is the value of Ux? How can i calculate it? is Ux = (U1 - U2) * R2/(R1+R2) correct?
majid khan's user avatar
2 votes
1 answer
74 views

Pulling 5V logic low using 3.3V microcontroller

I have a shop-bought, small, portable dehumidifier that is controlled by a 5V logic chip internally. I'd like to be able to control it remotely using an ESP8266 or ESP32 (i.e. 3.3V logic). I only need ...
Thinqer77's user avatar
0 votes
2 answers
156 views

Parallel capacitor affecting voltage divider circuit

Ran into a bit of a strange issue with a voltage divider. I take the voltage of a single cell li-ion and divide it down to a 0 - 3V range so it can be read by an ESP32, I then multiply this voltage by ...
Mukira's user avatar
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2 votes
3 answers
119 views

MP28167-A DC-DC converter recommends a resistor T-network in feedback loop

I am designing a DC-DC buck-boost converter using the MP28167-A, and the datasheet contains this section: I understand the need for a resistor divider such that the closed-loop control regulates the ...
TianCilliers's user avatar
2 votes
6 answers
305 views

Sanity Check: Does adding a second voltage divider change the properties of the original?

I have a thermistor configured in a simple voltage divider on a 5V circuit as follows: I have no control over that part of the circuit. The problem is that, at normal operating temperatures, that ...
dave mankoff's user avatar
1 vote
2 answers
92 views

Could a voltage divider with more than two resistors be used?

As a step in an exercise, I'm trying to find voltages \$V_1\$ and \$V_2\$ below Could a voltage divider (with more than two resistors) be used here? So that, for example: $$V_2 = \frac{2\ \mathrm{k\...
Sam's user avatar
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2 answers
63 views

Wheatstone bridge connected to op-amp: confusion about Vout formula

I am not sure when the correct formula for Vout is Vout = G(VA - VB) or Vout = -G(VA - VB). Can you explain the difference between these two examples? The circuits and the formulas provided are from ...
math_noob's user avatar
0 votes
3 answers
109 views

LDR and 2N2222A (beginner)

Learning electronic, I struggle understanding resistors values. I'm following a tutorial: Classic Circuits You Should Know: Light/Dark Detector. It uses a NPN 2N2222A as a switch to turn on/off a led, ...
NotARobot200's user avatar
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0 answers
159 views

TB6600 / using with low voltage stepper motor

I'm using a classic TB6600 Stepper Motor driver (see for example link) I have a stepper motor that is rated for 5 VDC (datasheet). I have the datasheet, but it does not specify a current limit. I ...
user3533030's user avatar
0 votes
1 answer
86 views

Voltage follower generates voltage by itself [closed]

I am currently working on a project that requires me to measure a capacitor voltage that can reach up to 250 V. To measure such a high voltage I first created a voltage divider with very high resistor ...
ektkourk's user avatar
0 votes
2 answers
52 views

Low-pass filter with a load

how can be the voltage of a low-pass filter be mathematically described when a load is connected? Is it possible to ignore the effect of the load on its voltage as something like this circuit can be ...
olympus_mons's user avatar
0 votes
4 answers
166 views

Trying to build a wattmeter and register it with Arduino. Will it work?

In the last three months, my electricity bill consumption increasead by 50% with no known reason. I got hyper focused on discovering how to prevent that and how to control my energy consumption better....
Marvin's user avatar
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8 votes
4 answers
1k views

Hysteresis on inverting terminal for comparator circuits?

If you examine 98% of circuits online that include hysteresis for a comparator, they always implement the hysteresis on the non-inverting input, like so: This is easy enough to calculate. However, ...
AJ_Smoothie's user avatar
3 votes
1 answer
103 views

Voltage divider in op amp

I don’t understand how they calculated V+. I would appreciate an explanation.
Raheeq Darawsha's user avatar
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0 answers
32 views

Find Vs and the power supplied by the 10V source [duplicate]

I am stuck on this textbook problem where the chapter is about Kirchhoff's Laws (Ohms, KCL, KVL, Voltage Division, Current Division, Wye-Delta, and lastly Dependent Sources). The chapter does not ...
Raquel's user avatar
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2 answers
101 views

How do I take a 24 volt DC 10-30 kHz PWM signal from a Click Plus PLC and convert it to a 5 volt DC PWM signal to control a pump?

I am working on a small dose spraying system for a farming application. I have a Click Plus PLC, part number C2-01CPU-2, and it has one IO card so far, a C2-14D2. I want the PLC to control a Kamoer ...
Ryan Vine's user avatar
1 vote
1 answer
88 views

Divide the voltage output of a DC power supply

I'm a beginner in electronics and I am teaching myself the basics of schematics and electricity. I designed this simple circuit that allows to choose individually the voltage across 5 resistors and ...
Hypno07's user avatar
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0 votes
0 answers
84 views

Parallel/Series Resistors Voltage measurement

I want to know the value of the resistors here. There are three conditions in this picture. Its getting really hard to fulfil the correct resistor values. Thats why i decided to post it here
Zunuran Nasrullah's user avatar
1 vote
4 answers
2k views

How can I read 50kV using the built in ADC of a Teensy microcontroller?

Can I use the voltage divider like shown below for stepping down the voltage to 3.3V? Is there a better solution to digitise the voltage values?
Rohan Kharvi's user avatar
0 votes
1 answer
62 views

Voltage divider as voltage sense

I used a voltage divider circuit for measuring the battery voltage. The problem I am facing is that every board needed to be calibrated as the value of resistors vary though I used resistors with 1% ...
Hrushabh Jadhav's user avatar
0 votes
1 answer
83 views

Non-inverting amplifier with offset

I have a non-inverting amplifier circuit shown in picture. This circuit has an input wave (-/+ 5V) and output needs to be 0 to 3.3V. I'll be using zener diode (LM 385) as my voltage reference. But I ...
luffy's user avatar
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0 votes
1 answer
128 views

Combining voltage divider, pull-down resistor and low-pass filter in analog sensor signal

I am integrating a KP236N6165 analog absolute pressure sensor from Infineon. They recommend the following circuit : My microprocessor which receives the signal uses 3.3V logic and is not 5V tolerant ...
Tommy95's user avatar
  • 179
0 votes
2 answers
71 views

Different answers from mesh analysis and voltage division

This is a problem solving for the voltage across a capacitor with initial conditions. After finding initial conditions and transforming into s-domain, the circuit looks like this: So, the voltage we ...
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