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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Esp 8266 doesn't replaying for AT commands [migrated]

I am working on esp8266 module with arduino uno board. This is my program. ...
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1answer
54 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 ...
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1answer
83 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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2answers
114 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 ...
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2answers
31 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 ...
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68 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 ...
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1answer
47 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 ...
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1answer
30 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 ...
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4answers
544 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 ...
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3answers
53 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 ...
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1answer
64 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 ...
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2answers
96 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 ...
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1answer
41 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 ...
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2answers
65 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 ...
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2answers
57 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 ...
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2answers
147 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
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3answers
522 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 ...
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0answers
35 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 ...
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0answers
49 views

Mysterious AC voltage on voltage divider when input is grounded (DC-offset circuit with LM358)

I have a DC-offsetting circuit with a voltage divider connected at the beginning (left-side). The input AC signal is supposed to be connected on the left-most vertical wire (currently grounded). The ...
7
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2answers
82 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\$ = ...
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1answer
43 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 ...
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2answers
45 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 :- ...
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4answers
199 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 ...
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2answers
56 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 ...
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1answer
27 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 ...
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2answers
78 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 ...
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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 ...
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1answer
41 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 ...
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1answer
58 views

Voltage divider, how do I calculate Vout?

I try my best to translate it. \$Z_2 = 20\Omega\$, and \$Z_1\$ is resistance variable which ranges from \$10\Omega\$ to \$200\Omega\$ I need to calculate \$V_{out}\$ for the value \$Z_1 = ...
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1answer
108 views

Why is an aluminum track not performing as a voltage divider?

I have an arm that moves along a track. I need to know its location. My idea was to have a wiper on the arm that acts as the output of a voltage divider. The voltage could then be sent to the ...
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0answers
44 views

Efficiently sense volage DC/AC?

In our current design we are sensing 50 Vdc input voltage through a microcontroller by using resistor divider network, caps for filtering high frequency noises,diodes for protection. The problem here ...
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1answer
46 views

Switchable Voltage Divider

To provide an adjustable, switchable reference voltage the the xVREF input (Iref -3uA to 3uA) of the current control of a DRV8825 stepper motor driver allowing to reduce power during stand still, I ...
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2answers
46 views

Voltage divider or zener clamp when coupling a comparator output signal to a DAQ?

As shown in above figures above, a comparator is outputting 16V pulse signal when it is ON. For some reason I want to lower this voltage around 8V pulse. In Config 1, it is coupled to a voltage ...
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1answer
99 views

Determining values of voltage divider resistors which interface an OpAmp and an input impedance? [duplicate]

Above schematics is just a representation of an OpAmp circuit coupled to a measuring device. Imagine we know the values of the following parameters: Vcc, Vout, R_feedback and R_measuring device. ...
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2answers
89 views

voltage divider — for detecting higher voltage in ADC

I am working on a BLDC sensorless motor. I need to detect BEMF Zero-cross event. My Motor is working on 24 Volt power. Now I need to detect the back E.M.F. As refered in this application note. My ...
1
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2answers
97 views

How to design a circuit which provides a range of voltages to test an ADC? [closed]

I designed a circuit to read analog signal, in range of -10V to +10V with resolution of 1mV. I need to validate my design by testing it in different input voltages. So I soldered a voltage divider ...
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2answers
118 views

High voltage voltage controlled linear variable resistor

I have some high voltage (300v+) analog circuits that I want to control digitally which requires the use of a voltage controlled linear resistor that can withstand the high voltages. I don't expect ...
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1answer
30 views

Thevenin Resistance and Voltage

So I've confirmed the Thevenin voltage ( between A and B ) to be .5V and a the VLoad as .3633V. I'm now supposed to verify that RLoad is 4k by redrawing the circuit as its Thevenin equivalent and ...
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4answers
771 views

Is using Zener diode with a voltage divider sensible?

I need to convert a floating 12 V voltage to more or less stable 3.3V. So I bought the appropriate Zener diode. Now, since there's such a difference in voltage, I want to make Zener's life simpler and ...
0
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0answers
81 views

Vds Voltage of Nmos transistor at Lineer Region

I know the conditions for mosfet Id equations in saturation, linear or cutoff mode. For this circut, how can we find the Vds voltage when we know only values of the resistors and Vdd at linear mode? ...
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2answers
102 views

Linear voltage controlled resistor divider

I'm working on an audio amplifier project and I'm trying sort out the solutions to certain problems. The problem that I most need to get solved is that I want to digitally control certain operations ...
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1answer
149 views

Voltage divider resistor power disipation [duplicate]

I am trying to create a power supply circuit for the ESP8266, using a voltage divider and a cellphone charger rated at 5V, 1A as power supply. I have resistors connected like this: The resistors ...
1
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1answer
93 views

Why is the voltage across collector and emitter pushing itself to 0.7 volts?

I designed a single stage transistor amplifier as shown in this schematic: I constructed this on a breadboard and applied the DC bias voltage to check the biasing conditions. Prior to this, I made ...
2
votes
4answers
268 views

converting 3.3v to 1.2v

I have a electrical problem that I hope to get some help with. Let me first start of by saying that I'm quite a noob in this field (I'm a IT guy), but I hope to learn something. The problem I have is ...
1
vote
1answer
68 views

How do you calculate the resistor value for a bicolor led

R4 and R5 have equal values. For both LEDs the forward voltage is 2V and the forward current is 30mA. I know how to calculate the correct resistor for a single LED. However in this case I am using a ...
0
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1answer
51 views

Voltage divider output / OP amp

I have a voltage divider, and the output goes to OP amp. This is from my schoolwork. -1 to +1 input | [R1] 1000 ohms | ---> output to op amp | [R2] 1000 ohms | 2v How do I calculate output that ...
1
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1answer
95 views

Is Voltage Divider a Noisy circuit?

I want to design a voltage divider circuit to bias an op amp, this circuit will be a part in another circuit to measure a biomedical signal. Is there a noise issue arises from using voltage divider ...
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2answers
34 views

The role of internal voltage source resistance in pulsed operation

I have a question regarding the role of the internal voltage source resistance in pulsed vs DC operation. Here is a sketch of the situation I imagine: simulate this circuit – Schematic ...
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2answers
88 views

Is voltage divider formula stated wrong everywhere?

Sample voltage divider circuit: simulate this circuit – Schematic created using CircuitLab In this circuit, \$Vout\$ is, by Ohm's Law: $$ Vin * \frac{R2}{R1+R2} $$ But this circuit, by ...
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1answer
80 views

Pull-up resistor causing unintentional voltage divider?

I'm trying to use the output of a comparator as the input of a schmitt trigger built with positive feedback on another comparator. Both have open collector outputs. When the two are not connected, ...