All Questions
Tagged with resistance voltage-divider
37
questions
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Parallel/Series Resistors Voltage measurement
I want to know the value of the resistors here. There are three conditions in this picture. Its getting really hard to fulfil the correct resistor values. Thats why i decided to post it here
6
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5
answers
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Non-inverting op-amp
Why is resistor R1 connected to the inverting terminal of the op-amp in a non-inverting op-amp configuration? What will happen if we replace it with a short circuit?
- 99
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4
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Why does voltage reading increase the greater the resistance load?
I'm new to electronics. So basically I already understand Ohm's law and the math behind why this is the case. What I don't get is the idea behind it.
Shouldn't the greater the load resistance be, the ...
user312602
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Calculating the change in output voltage as temperature changes the control feedback resistance
I am trying to calculate the new output voltage when the temperature changes the resistance of the feedback network which sets the output voltage.
I have this circuit using the MCP16311/2 buck ...
- 412
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1
answer
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Old potentiometer as a special voltage divider model
In an Adruino-like project that is built to deal with worn potentiometers (trimmer pots inside thumbstick, of alps alpine type), I am noticing a consistent set of input reading patterns among all old, ...
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2
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702
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Reduce a potentiometer value from 1M to 500K
I have an AC speed controller board and I would like to replace the 500K potentiometer on it with a potentiometer/switch combo to suit my application. However, the potentiometer I have is valued at 1M....
- 103
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2
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245
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Why is there a resistor in this circuit?
Why there is a 220 ohm resistor in this circuit? Can't we just connect the thermistor directly to the base of transistor?
- 1,498
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2
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470
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Voltage divider circuit load resistance?
For a test on circuits that I just completed, a question asked about a voltage divider circuit (see below.)
However, we were told to assume that the load had no resistance and was parallel with the ...
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3
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Voltage drop through a resistor compared to a Zener diode
A variant of this question has been asked a few times, but not received a response. Usually, we get an analogy with water pressure, or gravity, or a version of Ohm's law; not the actual cause-effect ...
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1
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243
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Multiple voltage dividers : finding resistances in a circuit
I have to set the battery voltage to 14.5V from the first divider, then from that I have to attenuate it to 1V to feed to the input of an op amp. Now this answer is inspiring but doesn't solve my ...
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2
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354
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Voltage divider for a voltage range spanning negative voltages
We have a sensor giving out a signal between -10 V and +10 V, and a signal acqusition device that only accepts voltages between -2 V and +2 V. So we need to scale down the signal into the smaller ...
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2
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297
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Very high resistance
I'm playing around with a very simple setup:
9V battery
light diode
voltage divider (R1 - three 1 kOhm resistors, R2 - one 1 kOhm resistor), which should give me roughly 3V for the diode
The first ...
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2
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2k
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Calculate op-amp input voltage with potential divider and series resistor
I have managed to confuse myself when it comes to calculating the voltage drop over a series resistor connected to a potential divider (See below):
The op amp non-inverting input is connected to a ...
- 99
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2
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244
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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 ...
- 1,282
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1
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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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5
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7k
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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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1
answer
987
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How to calculate current in voltage divider with load?
Say, I have this circuit (please ignore the zeros, and the diode should be some load that draws 10ua):
So, \$V_{in}\$ be 12V. I would say that D1 gets \$\frac{R_2}{(R_2+R_1)}\cdot2V\$ as voltage. ...
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1
answer
2k
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Fuel sender - need something to convert ohms to volts?
I need to connect a cars fuel sender(ohms) to a analog input on a GPS tracker (volts)
Here's the catch, in our tests most fuel senders we worked with seem to send the data as ohms/resistance
However,...
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votes
1
answer
487
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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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4
answers
565
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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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1
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Making a voltage drop while providing high current - how does this work?
I have a USB power source at 5V which needs to power a chip at ideally 4V (4.4V max) - but I need to be able to supply 2A of current for the "spike" current draws for the chip. In general the chip ...
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2
answers
142
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Measure resistance of multiple unknown resistors with single analog pin
I'm currently using the circuit below the measure the resistance of multiple resistors (R1 and R2) using a voltage divider with a known resistance (R1). I'm using a PNP transistor for every unknown ...
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How to make a open-circuit cable fault detector?
There are projects like this one over here: Underground Cable Fault Distance Finder, which checks if a given line is short-ciruited with any of the other lines. The location of the fault is also ...
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637
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Common Source JFET amplifier input voltage
I want to compare to different formulas which stand for same parameter/value.
Here is common source JFET amplifier circuit schematic:
Here is the first formula which should apply in general to all ...
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1
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405
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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 ...
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1
answer
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How to calculate the induced voltage?
From the given diagram:
Conductor(C) is the only movable part with given velocity (v), connected to a stationary terminals(top & bottom) and an exterior circuit with a load.
Will current flow to ...
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3
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2
answers
1k
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Cermet potentiometer temperature coefficients
I'm engineering a system that is temperature-sensitive, between ~-10-30C. I've moved to using cermet potentiometers because of their sub-200PPM/C temperature coefficients.
If I wire such a pot with ...
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2
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3
answers
2k
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Voltage Divider, increasing resistor value for solar tracker
I am working on a solar tracking device based on arduino and I am using LDR's (Light Dependent Resistors) as voltage dividers.
The wiring is similar to this:
The problem I am facing is that the ...
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2
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2k
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Working out current, voltage and resistance in a Bridge circuit?
This community is so helpful, my thanks go out to any comment I got with helpful advice.
Here's another homework problem.
I've tried working most of it out, but I have a feeling that I'll have to ...
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3
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The purpose of voltage-dividers in op-amp feedback?
simulate this circuit – Schematic created using CircuitLab
So, here we have a typical op-amp with negative feedback. The non-inverting input is at virtual-ground, and if the input is higher or ...
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3
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382
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Next level of resistor divider
I know how to calculate proportions of resistor values in resistor divider, but dont know how to jump into "next level" and calculate the precise values of resistors from proportion :
For example to ...
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2
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169
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Regarding the design of a basic voltage divider
I've just entered the fabulous world of circuitry and was wondering about the design of voltage dividers. I understand their function and formula quit well, but was wondering about the actual ...
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2
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Voltage Division Problem
I am currently taking MIT 6.002 course to get a head start prior to starting EE next fall. Right now, I am really struggling with this first lab.
Problem:
You have a 6-volt battery (assumed ideal) ...
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3
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Calculate voltage, current and resistance in a complex mixed circuit
How can I calculate voltage and current on each resistor (especially R5) in this circuit? What is its overall resistance? I have no idea how to do this.
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3
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What is the purpose of a voltage divider in a flex sensor?
I've been following this flex-sensor-arduino tutorial on setting up a simple flex sensor with Arduino, and I got confused on this part:
The flex sensor changes its resistance when flexed so we can ...
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3
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1
answer
1k
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Replicate thermistor behavior for second sensor
I'm working with an R/C electric motor that has a 10K thermistor sensor built into it, which is connected to a speed control that has basic thermal protection. I would like to build a secondary sensor ...
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8
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How does the electricity "know" the ratio of the resistance in a voltage divider?
I'm having a hard time conceptualizing what/how things are working in a voltage divider setup. I've read a couple other questions/explanations where the answerer has said to "not think about it in ...
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