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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95 views

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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56 views

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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HC-05 missing characters received via serial - possible issue with voltage divider

I have a HC-05 set up (like here) with the receive pin (of the hc-05) getting a voltage of 3.3V from a resistor network of 1.2k and 2.2k from the Arduinos 5V. (I also have a simple software serial ...
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72 views

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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64 views

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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147 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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31 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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31 views

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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104 views

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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64 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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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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66 views

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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53 views

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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61 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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1answer
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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59 views

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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55 views

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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Modifying the volume pot in a stereo amplifier

This must be a rather basic question. I have stereo amplifier with a 30K potentiometer serving as a volume control pot (two of them ganged together, to be precise). The pot is connected as a classic ...
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1answer
53 views

Limiting the pulse width of a PWM by using voltage divider and a single power supply

I'm using a Tl494 PWM and I want to limit the pulse width from 0% to 80% of the signal as maximum. How can I achieve this using a SINGLE 5v reference supply (I know it can be achieved by using two ...
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2answers
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How to calculate current into GPIO pin after voltage division

I want to use my Raspberry Pi as a remote power management device to turn my home server on and off. I would also like to monitor whether the server is on or off by using the power LED pins on the ...
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Are these 2 resistors in parallel?

So I had a circuit to analyse and I needed to find the equivalent resistor and then I arrived to a confusion. Are R1 and R3 in parallel? Here is the circuit. simulate this circuit – Schematic ...
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Filtering out everything below 12v on a car reverse light circuit

First of all I've like to mention that I'm by no means an electrical engineer. I'll try to explain what I mean with the title. I have installed a headunit which has an option for a reverse camera. ...
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Can someone please help me find the equivalent resistor of this circuit?

Well I have to find the equivalent resistor of these ones and I am having a hard time trying to find it so some help will be appreciated. Figure 1. Original schematic. simulate this circuit – ...
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2answers
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current limiter after a voltage divider for op amp input

I am doing a two-stages amplifier for a very small signal (-+300uV), coming from a radar sensor. The following two images are taken from application notes. I know R2 and R3 are voltage divider. 2.5V ...
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1answer
56 views

Questions regarding voltage divider for micro controller sensing

I am beginner trying to develop two voltage sensors for attiny85 microcontroller. I have two separate voltage levels that I want to sense using the attiny. One of the voltage supply is 0V-5.5V and is ...
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2answers
55 views

RC filter with voltage divider

I know I have got a trivial question but I can't find a proper explanation on the internet. In the image below I know that the formula for the cutoff frequency is f = 1/(2*PI*(R1//R2)*C). One way to ...
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1answer
68 views

Mismatch on string of resistors for DC bus voltage sensing

In the picture below, you can see a string of 10 resistors used for DC bus voltage sensing. I think that the blue resistors (the original ones) are 400k/1W. The colors are: yellow, black, black, ...
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69 views

Dividing output voltage from a buck boost converter

I am a student in high school and have been working with buck boost converters. I currently have a buck boost converter that steps up 5V to about 58V. I created 3 voltage dividers that should step the ...
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Battery monitoring using voltage divider circuit using 4 resistor

I want to measure the battery voltage using voltage divider on different ADC channel, as shown in image i have to used 4 resistor and generate 3V, 2V, and 1V from 4V battery. i want to measure all ...
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102 views

Amplifying Current Transformer AC voltage

I am using YHDC (SCT013) split-core current transformer (100A:50mA) for sensing 3-phase AC. I have connected a 33-ohm burden resistor to the current transformer and with the voltage divider circuit, I ...
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1answer
117 views

Tp4056 Module 12V input

I want to build a lithium ion battery charger with tp4056 module but most of my power supply's voltage is 12-19 V Datasheet says input voltage is 4.5-5.5v and current 1A Can I connect 1-3 tp4056 ...