# Tagged Questions

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 ...

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### how to bias diode limiter with voltage divider?

I'm novice in electronics and want to know how to bias a diode limiter with resistor voltage divider? Please show me a physical design or something near to physical design, not a schematic.
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I'm trying to calculate maximum input voltage that can be applied to a voltage divider based ADC circuit attached in the picture below along with converting the ADC raw value to actual voltage. In ...
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### Understanding a phase bump filter

For an application in the lab, I need a filter that bumps up the phase around 56 kHz by about 15 degrees, while not causing a big difference in gain at low and high frequencies. Ideally, it should ...
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### dual of voltage doubler

Voltage doublers, like those close to be one stage of Cockroft-walton multipliers, are well known. They allow to double the voltage of an AC input and can be useful at the output of a transformer for ...
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### No output voltage on wiper when using pot as voltage divider

I've been trying to teach myself about potentiometers and how they can be used as voltage dividers. I bought some Alpha 10k linear pots to use in a really basic test circuit. I intended to connect the ...
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### Voltage Divider give different values [duplicate]

I have made a simulation of voltage divider, and that give me the same value like on this calculator: http://www.ohmslawcalculator.com/voltage-divider-calculator But when I soldered my board I have ...
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### Oscillation in Voltage Rectifier / Scaling Circuit

I am working on creating a circuit that will scale +/- 12v input to a unipolar 3.3v centered around 1.65v, in order to scale the kind of CV used in modular synthesis systems to work with the ADCs on ...
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### Providing 5V from 12V battery with minimal energy loss

I notice that in switching power supplies for computers the final stage, where they convert, say 16V to 5V, often just a resistor is used to draw down the voltage. So, they are dumping 12V, which I ...
134 views

### How to measure an 15 kV electric fence to 0-5 v analog input of a arduino?

Good day I am a mechanical engineering student who is dabbling in electronics right now and am having a little bit of trouble in one project The Project: Making a gsm enabled voltage meter for ...
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### hx711 voltage measurements

wanted to use HX711 24-bit adc standalone to measure voltage range of 2mv - 20mv. Problem is: I cannot interpret the adc readings as it is in 2's compliment. What should i do in my code(code below) ...
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### Beaglebone Black - Maximum current supplied by 1.8V analog rail (Pin P9_32)?

On the Beaglebone Black, what is the most current that the 1.8V analog rail (pin 32 on header P9) can supply? I can't find it in the System Reference Manual. I would've expected to find it in ...
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### 24V to 3.3V Level Shifter

this is my first post so please excuse me for incomplete or improper text. I am developing an interface board to connect ‘Converter control unit’ to HIL system. For this purpose I need to level shift ...
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### Did I correctly use the Voltage divider rule to derive the transfer function?

Question and diagram are on link and NOTICE Rs is assumed to be a short. I believe the transfer function is going to be: A(jw) = 1/(jw*C1*R3+1) I arrived at this answer by using a simple voltage ...
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### 24 VDC source to 0-5 VDC or 4-20 mA manual input

I have a PLC which offers analog inputs of either 0-5 VDC (6 VDC max) or 4-20 mA (sink). The source will be 24 VDC and I want the input to be manually adjustable (assuming with a potentiometer). The ...
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### Comparator Question (and more general question)

I have been fascinated with electronics my whole life and read many books on it, but only recently have I began to really tinker, and I have often been befuddled by many salient details that are ...
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### Voltage Divider?

I am designing a piezo micropump driver that feeds into a piezo electric transducer that mists a liquid. Both of these designs have been testedindependently and now its time to integrate. BST of ...
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### Sensor Module misbehaving when connected to a voltage divider

I am using this sensor module with Raspberry Pi 3 http://www.sunrom.com/p/optical-slot-sensor Since this is a 5V sensor, I connected a Voltage Divider circuit. But the sensor misbehaved. The output ...
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### How to maximize the voltage range using an operational amplifier (differential amplifier)?

I'm trying to maximize the voltage range using voltage dividers and operational (differential) amplifiers, but am not able to do it. I do not have an electrical engineering background, but my project ...
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### Split voltage in 2 to distribute to 2 separate circuits

I have 2 motors that takes about 6Volts and I have a battery that gives 12+V. I need a way to ensure that both motors get 6V rather than one getting more. Is there a way to split the voltage into ...
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### Output impedance of voltage divider?

When connecting a 10S LiPo (42V) to my ADC via a voltage divider, I began wondering how to calculate the output impedance of the divider. simulate this circuit – Schematic created using ...
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### 24V battery to drive a 5V arduino speed controller and a motor

I would like to use a 24V power supply to power (1) an arduino that will act as a speed controller and (2) a DC motor by using an NPN transistor. I am wondering how I can use the same battery to split ...
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### analog level conversion in ADC circuit

I'm trying to feed a 3.3V ADC from a gas sensor that operates at 5V. I know I can use a voltage divider, but am a bit confused how it would apply here. Datasheet: https://cdn.sparkfun.com/datasheets/...
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### Voltage Divider producing unexpected voltage

I am attempting to create a voltage divider that create 4.5 volts from a 9v battery. Using the voltage divider equation 4.7k / (4.7k + 4.7k) ) * 9v = 4.5v, I ...
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### Why some circuits uses additional resistor with pot in dividers?

Are there any profits of using the first circuit for divider instead of the second one? simulate this circuit – Schematic created using CircuitLab
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### AC voltage measurement with a microcontroller

I want to build a circuit that will eventually calculate power, power factor and thd for a light switch or a wall outlet. But I'm having some problems with the voltage measurement circuit. ...
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### About voltage divider resistor network

I need a precision decade voltage divider. And there is a product from Visahy just can do what I want. But it's soooooooooo expensive! So Why they are so expensive? I need the ratio tolerance at ...
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### Why can I power a 9 volt application on the Collector side of a transistor, and not the Emitter if Base gets 5 volts.

I have a 9 volt application that I want to trigger using an Arduino and an NPN transistor. The Arduino can supply 5 volts to the base. I tried to place the application on the Emitter side of the ...
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### What difference will it make on the output between these two circuits?

In the above image there are two figures, Fig(a) consists of force sensor connected to a resistor in a simple voltage divider configuration, and its output is fed to an ADC. Now coming to Fig(b), its ...
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### Single supply amplification

I have made a single supply non inverting amplifier. The supply voltage given is 5 V. The schematic is shown. Now the problem is I am not able to generate 2.5 V accurately which is affecting ...
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### Allpro adapter and Arduino - UART

I couldn't find for allpro obd uart if the RX pin should receive 3.3v or 5v from Arduino TX pin (since the Arduino will send 5v by default without voltage divider), so I was wondering if someone can ...
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### Reducing the voltage of a PWM signal

I will be needing a 1.25V PWM input into an LED driver (AP8802) and will have to interface it with a 5v PWM output from a micro-controller (ATMEGA328). Would a simple potential divider do the job, or ...
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### Why is the voltage across a Zener diode so dependent on current?

I was going to use a 3.3V Zener diode to protect the analog inputs of an Arduino Due, but I found that the voltage drop across it was only 2V. So I tested connecting it to my power source with a ...
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simulate this circuit – Schematic created using CircuitLab I am a newbie and this may not be a tough one. I am using Arduino UNO and trying to find the unknown resistance with the above ...
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### Voltage divider not working

I have been experimenting on transistors recently with this simulation , it works as expected and all make sense except the V1 value. In the schematics below I ...
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### Signal offset using FRDM-KL25Z

I am developing a voltmeter using FRDM-KL25Z and I needed a voltage divider with a 1.65V offset, and here is the circuit I am using: Does the offset work well? Is there any other (easy) way to do ...
174 views

### How to build a “stable” voltage divider?

I'm trying to build a EMG (electromyography) acquisition circuit. In order to power the operational amplifiers I'm using a voltage divider with 6.2k resistances and the voltage from the wall is 18V. ...
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### Wiring a membrane potentiometer to give two outputs

I'm using a softpot membrane potentiometer in a project and I have found that pressing two fingers on the strip gives strange results. I was expecting it to short to the lower resistance value but in ...
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### Feeding a load with very low impedance

I need to provide a reasonable amount of power (40-50W) for a heat pillow, how should I design the power supply circuit if the load (Enamel Insulated Resistance Heating Wire) is 2,5 ohm. I can't ...
121 views

### How to combine LED and voltage divider

I want to detect the presence of a 8.4V voltage source from an Arduino, so I'm using a voltage divider to step it down to a voltage safe for the Arduino to read with an digital pin. However, for when ...
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### I do not completely understand the intuition behind equivalent sources used in source transformations

My book states that two circuits can be considered equivalent if they produce the same voltage and current in any resistor connected to the two ends of the circuit. The book then goes about proving ...
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### Can I use a voltage divider for shifing logic levels?

I'm trying to drive a 3.3V IC from an Arduino which has 5V logic pins, so I need to shift that 5V down. There's no data from the 3.3V device to the Arduino so I don't need to shift back up. Can I use ...
135 views

### convert [-24V,24V] range to [0V,3.3V] range

I need to realise a circuit that converts an analog signal from [-24V,24V] to [0V,3.3V] before sending that signal to an ADC "MCP3208", I found the circuit in the picture above,it works perfectly in ...
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### Resistor failed open

I am using this voltage divider circuit on a control board. Customer brought a board back stating the board wouldn't function after a few months in the field. After inspection, I found the 4.3kΩ ...
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### How do I vary the range of output of a variable voltage divider

A voltage divider follows a fet in an audio booster. The pot in this divider is 250K and I'm reading a range of 0 to 6vac in my circuit. Because I want to build this into a volume pedal I'd like to be ...
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### Ohms to volts i [closed]

Hi I am not sure if I understand this! Ok if I have a power source of 5 volts which then has a resistor of 6ohms and another resistor of 4ohms in parallel with a volt meter would I add the two ...
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### Voltage Drop on parallel resistor

I am trying to verify voltage drop across a resistor as seen on my multimeter with basic ohms law calculations. As shown in below circuit (from Electronics for DUMMIES). The multimeter shows a ...
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### Resistive ribbon sensor multiple readings

I created a resistive ribbon sensor using a resistive strip as follows: When making contact between A0 and the resistive ribbon (e.g. at the location of the red circle) using a bridge, I can ...
622 views

### Is this clamping voltage divider for a high-impedance input a good, robust design?

I have an AC input as follows: Can range from ±10V to at least ±500V continuously. Runs from roughly 1 Hz to 1 kHz. Needs > 100 kΩ of impedance on it, otherwise its amplitude changes. May ...