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 ...

learn more… | top users | synonyms

0
votes
1answer
55 views

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 ...
0
votes
0answers
33 views

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 ...
4
votes
2answers
61 views

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 ...
0
votes
1answer
31 views

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 ...
0
votes
2answers
61 views

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/...
0
votes
2answers
94 views

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 ...
3
votes
5answers
163 views

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
2
votes
2answers
112 views

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. ...
0
votes
2answers
62 views

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 ...
-1
votes
1answer
44 views

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 ...
-1
votes
0answers
40 views

Using a voltage divider to charge a lower powered device on a higher powered charger

So I have a Surface Pro 2, and I got a (what i now realise to be) dodgy charger from eBay to replace losing my other one. This dodgy charger has gone and fried itself - spewing sparks everywhere, ...
0
votes
2answers
97 views

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 ...
0
votes
1answer
46 views

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 ...
0
votes
2answers
33 views

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 ...
0
votes
1answer
57 views

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 ...
1
vote
1answer
162 views

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 ...
0
votes
1answer
51 views

Voltage divider with ADC

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 ...
1
vote
1answer
97 views

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 ...
0
votes
1answer
17 views

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 ...
1
vote
2answers
164 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. ...
0
votes
2answers
54 views

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 ...
2
votes
2answers
44 views

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 ...
0
votes
2answers
118 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 ...
3
votes
4answers
53 views

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 ...
2
votes
1answer
73 views

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 ...
1
vote
0answers
121 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 ...
1
vote
2answers
120 views

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 ...
0
votes
2answers
33 views

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 ...
-5
votes
2answers
71 views

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 ...
0
votes
1answer
59 views

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 ...
0
votes
1answer
31 views

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 ...
10
votes
4answers
583 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 ...
0
votes
3answers
69 views

Voltage divider output with analog voltmeter

I'm using a voltage divider to bring down 24V to 5V and attaching the output to an analog voltmeter gauge. So my question is should I be counting the resistance of the analog gauge into the value's of ...
0
votes
1answer
66 views

Loaded Voltage Divider

Could I get some help with this question: Set up an equation for the I (V) containing constants E, R1 and R2 and variable U, when the voltage in M1 is loaded. RL shall not be included in the ...
1
vote
2answers
99 views

What resistor values should I use for a voltage divider that has to operate at low temperatures?

I'm designing a flight computer for a lightweight pico balloon - it will (hopefully) operate in the upper atmosphere down to around -40C. To keep the weight down, the whole thing is going to be ...
0
votes
1answer
42 views

Voltage Mixer with 3 Resistors

The above is the requirement, I have configured a circuits as shown below simulate this circuit – Schematic created using CircuitLab I have solved the above schematic using superposition ...
1
vote
2answers
83 views

Power Supply Issue, Voltage Drop Under Load

I have the Ardupilot Mega flight control board (APM), which outputs 4.8V. I want to power CC3200 MCU with it, which needs at least 3V for stable operation. I power APM using a power module connected ...
0
votes
2answers
71 views

voltage divider in series and parallel circuit

I have these two series and parallel circuits and I want to know how I should find the voltage through R1, R2, R3 and R4. I know I should use the rules of voltage divider but I don't know how when I ...
0
votes
2answers
177 views

Reducing the AC voltage using resistors

I want to reduce 220VAC to 5VAC and using one 100K Ohm resistor and another 2K Ohm resistor. Two resistors are connected in series and measuring the voltage from middle of two resistors. I am happy ...
2
votes
3answers
535 views

Is voltage divider applicable on circuits where there is no ground?

For the circuit below, if the bottom terminal is -Vin and not grounded, is applying voltage divider possible at all? If this is the case, what would the equation be? I never heard of a voltage ...
0
votes
0answers
37 views

Voltage divider equation in Bruce Rosenblit's Tubes and Circuits

Tubes and Circuits introduces filters and transfer functions in the same breadth. I'm having some embarrassing issues with the first voltage divider equation that he introduces. He's already solved ...
7
votes
2answers
91 views

How Do I Limit My Motor Current While Maintaining Voltage Drop Across It?

I am trying to build my knowledge of working with dc motors by using an IRF510 MOSFET to switch a motor on and off. Please refer to the schematic below to see how I hooked everything up. \$S_1\$ = ...
1
vote
1answer
47 views

BAT54c and TVS SM6T39A application usage?

I need to design a circuit for my vehicle tracking application and i am using pic micro-controller . I need to capture the iginition status of a vehicle using the micro-controller ,where i have ...
0
votes
2answers
56 views

ADC resolution after voltage divider [duplicate]

I am working on a project where I have to monitor Vehicle fuel levels using an ADC of a micro controller. My fuel signal is a 0-12V signal & my 10 bit ADC is 0-3.6V range. I have 2 questions :- ...
0
votes
4answers
234 views

Powering Arduino from a voltage divider

I'm making a voltmeter for the college senior project, and the problem is that voltage divider should equally split 17V into two 9V(nominal value of the batteries. As of now, an actual voltage is 8.5V ...
0
votes
2answers
73 views

Voltage divider with offset

I am trying to build a voltage divider with an offset. I have an input signal of 10 Vpk and I want it to have a DC offset of +1.65 V. The problem is that I don't have a DC source of 1.65 V, but I do ...
0
votes
1answer
28 views

Multiple voltages and currents required in one circuit

I have a circuit with the following components: microcontroller - 7-12V, v.low current 2x Servo - 6V, 250mA Solenoid - 18V, 14 Ohm coil Geared motor - 9V, 6A stall current Power supply - 19V, 3A DC ...
0
votes
2answers
97 views

Sensing Voltage with a Digital Pin

I am relatively new with Arduino and did a little bit of research prior to this post. But I am trying to sense when I have voltage coming from an AC/DC converter (12Vdc) so I can switch from my ...
0
votes
1answer
37 views

Weird behaviour from S1J-13-F Diode

I have the following circuit in which I expect a 1.1 V voltage (datasheet)across the diode but I am measuring 6.18 V. This voltage is output no matter what way around I have the diode, consistently &...
0
votes
1answer
49 views

DC LVDT Excitation voltage to NI CompactDAQ

I am currently working on getting reading from an LVDT for a project the present model is the DC LVDT model Omega LD620-25 As per it's datasheet the model requires an excitation voltage of 10-30V and ...