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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3answers
230 views

Voltage divider as supply voltage [duplicate]

Is voltage divider is a good option for supply voltage to an IC ? I am working with a 555 timer, MAX232 ,an Inverter SN74LVC and with a 12V relay. I heard that voltage devider is not a best way to ...
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96 views

Measuring 200 volts safely

While I can measure line voltage safely, I need to write a procedure to have someone else measure the voltage. The load is pure resistive,and I want to measure the voltage across it, with a battery ...
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Connecting an analog temperature sensor IC to an ADC input of a microcontroller

I am trying to connect an analog temperature sensor LMT84 (http://www.ti.com/product/lmt84) to a micro controller (3.3VDC) using its ADC pin which is 1.4V tolerant (max). My Vcc is 3.3V, ADC max ...
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241 views

Voltage Dividers for a beginner (with respect to soil moisture sensors)

I've just started with electronics and want to make an analogue soil moisture sensor (with Arduino). When I looked online for an explanation of the working, every site said that it works as a voltage ...
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98 views

Setting Over voltage and Under voltage limits for LTC4364

I am trying to set under voltage, over voltage and over voltage clamping limits in a circuit for Overvoltage Output Regulator with Reverse Current Protection using LTC4364 device. The LTC4364 uses an ...
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114 views

dividing voltage of shunt Vref Lm4040

the whole thing i'm trying to do for about 3 mounth's is measuring IR-level with high accuracy, i tried many newbie circuits with huge noises, unstable results etc.. then i focused on ADS1110, an ADC ...
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128 views

“mapping voltage” on an analog potentiometer using a voltage divider

I'm working on a simple project to learn electrical circuits. I built a little sound box that will play tones when you press buttons. The battery provides 3volts and the "power boost" is a buck ...
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4answers
179 views

Buck topology for a 3.3V to 1.1V for a SoC [duplicate]

I have been given this circuit in a design guide and it does not make sense for such a complicated circuit to be implemented just to get 1.1V out. It requires 3.3V (input) and will give 1.1V out. The ...
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219 views

OpAmp VS Voltage Divider VS Buck Converter (Current Sensor Output)

I'm working on part of a project and I need to build the circuit that reads the current through a phase of a motor using this IC from Allegro. Assuming there will be no more than 5A, and using a VCC=...
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59 views

1v for non-inverting op-amp input

I need to reduce 5v to 1v for use as a reference voltage in an op-amp. What would be the best way to do this? The simplest solution to me is to use a voltage divider, although I understand others ...
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58 views

Scaling signal voltage

I have a signal which toggles between 7v and 0v up to 100 million/sec. The receiving IC only accepts voltage levels up to 3.3v. What would be the best way to lower the voltage from 7 to 3.3? I ...
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118 views

Most efficient way to drive an LED from 9v source?

I have a circuit that I am powering from a 9v battery. I bought little 3mm flat LEDs and I want to use one for a power indicator, but don't want to use a voltage divider that will consume too much ...
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131 views

What should be the voltage divider resisor values in units?

I'm trying to build a circuit that lights up a LED when a battery connected to it is full charged. I found LM358 lying around so I plan to use it as a comparator. I want a 3.7v using a voltage divider,...
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289 views

Voltage divider with ac source

Left side of the voltage divider is a bit confusing. How would AC react with DC voltage? Considering a high frequency ac source, capacitor would act as a wire. So what will be the output voltage? ...
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227 views

step down voltage follower

I'm trying to create a circuit that will divide the input voltage in half, but still be able to supply a high current to the load. My input voltage varies from 10-15v and I want the output voltage ...
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3answers
380 views

How should I protect from overvoltage ADC?

I have a microcontroller with a built in ADC that I am using to read from an input pin (ATMEGA328P to be specific). I want to allow switching of resolutions on the input for our users (0-5V range, and ...
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133 views

Why is there a divider circuit here?

So I'm pretty new to electronics and just started playing around with the Arduino to learn the basics. In one of the projects there was just a simple button and 3 LEDs that are controlled by the ...
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1answer
101 views

The Art of Electronics 1.35

Forgive me if this is not the proper question format. Please critique it if not. I am new to this site. I am reading "The Art of Electronics" and cannot understand the jump made in equation 1.35 to ...
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1answer
231 views

Want to convert 14.8v to 5v at Max 30 Amp current draw

I want to convert 14.8v to 5v at Max 30 Amp current draw. IS this possible using resistors?? I don't know that how much current a resistors can draw without any circuit issue. Readymate solution for ...
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1answer
74 views

slight voltage reduction

I am powering a circuit on 4 AA batteries. 6v is not going to hurt the circuit, but it runs more optimally at 5v. Is there a simple and effective way to drop the supply voltage by 1v to get the best ...
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2answers
42 views

Capacitive voltage divider with varactor

Is it possible to create a capacitive voltage divider where one of the capacitors is a varactor whose capacitance can be manipulated/varied according to a signal? A varactor is a two port device; what ...
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1answer
79 views

How does the voltage divider model a voltage source in this transistor bias circuit?

I encountered a text which says that the leakage current Ico (or called Icbo) adds up to the signal current hence causes thermal runaway because it causes temperature to increase and it also increases ...
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1answer
162 views

How does this circuit works ? Usart level shift

I'd like to ask how does this circuit works: I understand how it works in principle, but not technically. It's a USART voltage level shifter. It's supposed to divide 5V to 3.3V by a resistor divider, ...
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2answers
213 views

Voltage drop using resistor divider for ADC sensing

I am using a micro controller (TI CC3220 - http://www.ti.com/lit/ds/symlink/cc3220.pdf) which uses 3.3VDC for its operation and has an ADC input range of 1.4VDC. Questions In order to use the ADC ...
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Need fast and exact voltage follower or divider cascade

Intro: I'm designing a makeshift oscilloscope and now need an input cascade for it (it is more fun project for me, rather than industrial-grade tool). The matter is I want to get something faster ...
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1answer
128 views

What kind of diodes are these?

I think they are tvs diodes but i can't find what type they are.
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What's the name of this circuit?

As i said in the title what's the name of that circuit and any characteristic for it?
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4answers
103 views

Strange behavior of voltage divider

I am using a voltage divider to supply a voltage to a system (I don't know what sort of circuit I am supplying the signal to, except it's used to drive a very large motor. It needs a 0-5v signal). ...
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3answers
193 views

Finding current when short-circuiting the terminals

I am working with the circuit shown below. I am having trouble with the situation where: if a short circuit is connected between Terminals A and B. what current would flow through the short circuit ...
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71 views

What is the output voltage of a circuit containing a voltage divider and a resistor?

In electronics, if a voltage divider resistor network has a 4Kohm resistor on the high side and an 4Kohm resistor on the on low side and the supply is 3.3 volts, what is the output voltage?
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57 views

Avoiding accidental earthing, voltage rejection, and voltage dividers for a motor control output circuit

I'm trying to connect up an integrated control DC motor with a 24V output (Motor manual - relevant page p32) with my 10V PLC (PLC Manual), and looking for a little help please. I don't understand why ...
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1answer
258 views

How output of current transformer is given to voltage divider circuit in given circuit?

This block diagram i have referrd from IEEE paper for reference for doing project The project is about "Resisdence energy control based on wireless smart socket and Iot. In this diagram here CT's ...
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2answers
265 views

Using NPN transistor as Thermistor emulator

Premium motherboards (Asus Crosshair Hero VII) have T_in 2pin header for 10k thermistor temperature monitoring. Probing around reveals internal voltage divider with ~12KOhm rTop resistor (as per ...
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395 views

Voltage Divider For DC Fan

I have been researching various ways to control DC fans and out of curiosity bought a fan that has a 4-position switch with off, low, medium, and high settings. I thought that a voltage divider should ...
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1answer
101 views

Will running a signal through a voltage divider change its phase?

I'm reading a web page about filters (https://www.sensorsmag.com/components/introduction-to-analog-filters) and noticed something that doesn't make sense. The web page says if you run a signal ...
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1answer
365 views

Calculating voltage drop across capacitor

Generally, i have no idea how to solve it. I thought about doing superposition method on every source, but i guess there have to be some method to do it faster.
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2answers
135 views

Using a voltage divider so i can see voltage ripple on my cheap scope

I have been trying to measure the voltage coming from my boost converter to see how clean the signal is but i only have a cheap oscilloscope so when i set the range to the millivolts the signal jumps ...
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2answers
123 views

Voltage divisor with op amp

Why is it not right to use the classic Vo = Vin*R2/(R1+R2) voltage divider formula in the marked area? I want to obtain the voltage, in terms of Vs, in the non inverting input of the op amp. But if I ...
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1answer
608 views

will this timer/delay circuit works as intended with almost equal opamp inputs?

I just saw this video about a so called delay circuit using opamp in comparator configuration. The author mentions to use a pot as a voltage divider to feed the (+) input and the node between a series ...
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3answers
128 views

Whats wrong with this circuit?

I need an output of 882.3 mV in the highlighted node. According to my calculations the output must be that with Vin=15, R1=17K and R2=1k. So there must be something wrong with how the circuit is wired....
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What's the purpose of these two diodes in this circuit?

What's to point of using these two diodes? Can't you just replace them with a resistor?
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213 views

Buck/boost output voltage manipulation via feedback node

I'm designing an emitter follower circuit attached to the feedback node of a Buck/Boost SMPS in order to pull current out of the node and subsequently increase the output voltage by varying a DAC ...
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4answers
122 views

The effect of combined resistors?

I need to convert 5v to 3.3v, easy. I need an 2k resistor though so i looked if two 1k resistors could achieve the same effect. I found pretty contradictory information on the subject though, could ...
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4answers
710 views

Switch-mode power supply output voltage manipulation via feedback node

I'm trying to design a cheap way to pull current from the feedback node of a SMPS in order to dynamically control the output voltage, as explained in this application note:http://www.ti.com/lit/an/...
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2answers
918 views

Voltage divider to measure 12v battery with arduino low consumption

I want to measure 12v. Car battery with arduino. Three questions: Is the R1 and R2 the best values? The car battery can go from +10v. To +15v. How and what can I use to save power between the ...
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1answer
184 views

High voltage limiter with discrete components

I'm designing high-voltage enclosure circuitry that engages a lock when either of two HV supplies reach 50V or greater. Both are capable of 6kV output. Below is what I have so far, where R7 ...
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1answer
744 views

Why use a ten-percent rule-of-thumb for a bleeder current on a voltage divider?

A book I am reading recommends "The 10 Percent Rule" as a method for selecting resistors for a voltage divider: The book claims it is a standard method. My question is: why choose a bleeder current ...
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1answer
106 views

Voltage divider network calculation

Hello I am troubleshooting a voltage divider circuit in which I know the output going to U28 pin 3 should be around 700mv. What I am measuring however is around 7.5v. How do I calculate the v out for ...
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2answers
317 views

How to effectively downscale input voltage of a device?

Oscilloscopes let us measure input voltage in a variety of input signal ranges (either AC/DC, +/- 500V or Gigahertz's of frequency). I am wondering: how they make it happen? Say, an oscilloscope has ...
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3answers
517 views

voltage divider circuit design [duplicate]

I am giving -8 to +8 V supply to the op-amp. So, output of the op-amp is varying from (-8 to +8) V. I want to give this to ADS1115 ADC module. But the ADC module's max. Vin is 5.5 V. I decided to ...