Questions tagged [voltage-measurement]

Act of measuring voltage

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2answers
32 views

Am I measuring the Op-amp MCP6004 IC output voltage correctly using Arduino

Right now I am testing an MCP6004 Op-amp IC. A sensor in my main circuit going to give me a signal in the range 0-0.5 V max. So, I want to amplify this in the 0-5V range so that my Arduino reads it ...
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1answer
79 views

What is my multimeter measuring when in AC mode?

My multimeter says "True RMS". Nowhere in the manual do they say that when in AC mode, the value displayed will be the RMS. Appearently it is so obvious for everybody that they just don't ...
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2answers
56 views

EC probe for hydroponics; physical design considerations

I want to build a simple EC-meter with two electrodes for a hydroponics project. A naive solution would just have the (copper plate) electrodes hanging into the water, but then the active electrode ...
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1answer
47 views

Is there a need for signal isolation before its measurement?

A few days back, I saw a board which had an AMC1200 to isolate an input signal which is then feed to an ADC. The AMC1200 is an opto-isolation differential amplifier. I don't understand why you need to ...
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1answer
43 views

Bluetooth receiver board into 60's console stereo Tape In

I'm looking for a bluetooth receiver board to connect to the Tape In of my 60s stereo record player console. We've used our Android phones with a 1/8" to RCA Y cable into the Tape In, and it ...
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1answer
40 views

How to find the best settings for Cyclic voltametery test?

I am trying to conduct a CV TEST (Cyclic Voltammetry). However, I am unable to get the current peaks on my plot. I tried different ranges of Voltage at different scan rates. However, I could not ...
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0answers
58 views

Battery Packs not showing any voltage on multimeter

I made 4 battery packs with 10 batteries in series each using a spot welder. Each of the batteries in each pack are 1.37V, but when they are connected, the voltage is shown at zero. I took the ...
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3answers
287 views

How can I do two points scaling in electronics? 0.6 V - 3.2 V to 0.0 V - 3.3 V

I'm seeking a solution how to do a two point scaling in electronics. I have tried an Op-amp, but it did not work very well. So I wonder if you have some ideas how to do two point scaling from e.g 0.6 ...
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1answer
41 views

ATM90E26 Calibration method / circuit

I'm trying to calibrate the IC ATM90E26. This is an energy metering IC, it measures current through a shunt resistor and voltage through a voltage divider circuit. The IC will be part of a 220V AC ...
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2answers
43 views

Current Voltage Curve of a motor

I have a question that has been bugging me for a while. I have an 48 W EC-fan with nomimal Voltage 24 V (voltage range 16-30V). I wanted to plot the current-voltage line of the motor so I thought of ...
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2answers
44 views

Will my deep cycle battery protect itself from full depletion?

I have a 12 V, 55 Ah lead acid deep cycle battery that I am using to power a small cooler/fridge that will hold medicine for a community project that I'm working on. The goal is to provide continuous ...
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1answer
35 views

battery low voltage cut off breaker (manually reset)

First off, I am aware that premade devices like this exist however I have been unable to find any that fit my exact needs which are as follows. 0 power draw when in the off state Minimal voltage drop ...
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1answer
42 views

Voltage and current sensing hardware on chip

I have an external R C circuit excited by a step voltage source ( to be present inside a chip) to find the values of components R and C through transient analysis. Since we need to know voltage and ...
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1answer
35 views

Measuring voltage with dynamic voltage divider and Arduino with ADS1115

Is a “dynamic voltage divider” even a thing? I am using an ADC ADS1115 to measure voltage on batteries. Now these batteries are sometimes 12 volts, 24 volts or a bank of 48 volts or even 72 volts. To ...
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1answer
58 views

Bus Bar voltage calculations for renewable integration to grid

I am confused on the problem bellow I started off by use P=IV = V^2/Z --> V=sqrt(P*Z) Assume at each bus bar the power from the PV is being given to the grid with +6KW from knowning that the PV ...
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0answers
18 views

AD8310 DC-coupled input slope

I have already asked this question in the ADI forum, but I haven't got the answer yet, so I will just copy the question below. I hope somebody could help me with it. I want to use AD8310 for ...
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1answer
39 views

control dc dc converter board with the microcontroller

I want to control a bidirectional buck boost dc dc converter evaluation board evaluation boardusing STM32 Nucleoboard MCU. The evaluation board is having only I2C interface. I am connecting a 12V lead ...
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1answer
67 views

How does the voltage at the R4(1) point become 3.78V?

How to calculate the voltage between R4 & R3? I got that due to the two 10k resistors there's a voltage divider happening which causes the point between R1 & R2 to be at 2.5V. But then doesn't ...
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2answers
50 views

Placement of MOSFETs in switchable voltage divider for voltage measurements

In my battery powered application I am using a switchable voltage divider to not drain the battery. I have seen switchable voltage deviders in two versions: MOSFET at the bottom MOSFET in the middle ...
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1answer
63 views

How about this design of analog comparator? [closed]

These day I design some transistor logic circuit for the high voltage sensing. I complete other necessary logic gate but, I didn't decide comparator circuit yet. Are there any improvements to this ...
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2answers
57 views

Is it possible to pass a (voltage-based/amplitude modulated) digital data signal using just one wire?

This isnt a naive question - I hope! In virtually every situation where a signal is sent by wire, it uses (at leasst) two wires - one for some kind of reference voltage, and (at least) one for the ...
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2answers
31 views

Measuring battery with low power requirement

I am trying to create a low power device, which would work off a LIR2450 or similar coin cell battery. athe device has long periods of sleep with short periods when it performs operation (e.g. reading ...
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2answers
125 views

How to make an LED turn on if the input voltage is below 5V?

First of all I'm new to electronics. I am an automation engineer and a robotics integrator, so pretty specialized. Please be clear! Thanks all. Context: PLC special circuit needs to stay at 5V ...
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2answers
88 views

Switchable current shunt resistor

Looking at the reference design given for INA826 in the image below, what would my best options be if i wanted to replace J8 with something allowing me to switch in R19 (sense resistor) from a ...
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1answer
71 views

Find the voltage Vab and current of the circuit I

I was asked to find the voltage Vab and the current of the circuit I. I tried finding the voltage in ab using voltage divider, but I have two voltage sources and I don't know how to make the ...
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3answers
107 views

AC mains isolated voltage measurement

I am looking for a AC mains voltage measurement circuit for my controller which has to be isolated. There are a lot of circuit using step down transformer, but all of them are too large for my project....
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0answers
26 views

Power Dissipation in Subtractor Op-amp Circuit

How much power can be assumed to be dissipated through the resistors of an op-amp configured as a subtractor like the one below? Theoretically, a very very small current should pass, but I don't know ...
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1answer
42 views

How to detect AC or DC voltage from 9V DC to 250V AC?

I have a device that needs to detect the presence of voltages from 12V DC up to 240V AC RMS (Absolute maximum of 9V DC to 250V AC RMS) This device is going to have up to 8 channels that should be able ...
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0answers
26 views

Circuit design - Measure power supply and detect power failure

I have an idea to measure separately power supply and battery voltage. I am not so sure if going with following design is good idea (my apologies.. using MS paint). Some external chip in LOAD should ...
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1answer
65 views

Isolated AC line voltage monitoring circuit

I found this https://www.edn.com/isolated-circuit-monitors-ac-line/ circuit in my quest for a low cost isolated AC line voltage monitor and constructed it. On testing however, I am not getting the ...
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2answers
96 views

How can there be voltage across resistors in series when circuit is open?

If you have a circuit containing 5 resistors, and one of them gets damaged such that current can't flow through it, I assumed no current would flow anywhere throughout the circuit, and that the ...
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1answer
2k views

Why is my 50-600V voltage tester able to detect 3V? [closed]

I used non-contact voltage tester to test burned out Christmas lights. It says it can only detect in the range of 50-600V. One of the strings has 40 bulbs in series and none of the lights are burned ...
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0answers
74 views

DC voltmeter and full wave bridge rectifier in Proteus

I am trying to measure the average voltage on a resistor but I see always zero like below: I connected ground but the result was the same. When I add a parallel capacitor in R1, there is no problem ...
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0answers
30 views

Voltage Drop/Sag - Current Limited Source

I'm tinkering with the idea of adding a display for gear position on my motorcycle. It already has a gear position sensor that connects a different resistor in series to ground, depending on the gear ...
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1answer
45 views

How does the circuit of ITD(Time delay) and voltage sense works?

I have designed the schematic of ITD(Intelligent time delay) and voltage sense by tracing the circuit of AC Guard unit in which it senses the voltage and cut off the supply based on predefined upper ...
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1answer
51 views

Peak-to-Peak vs Mean Voltage Measurement

I am using an oscilloscope with 2 probes to measure the average voltage across a resistor over time. In regard to the measurement modes for the 2 channels on my oscilloscope, I am not sure whether to ...
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0answers
35 views

ACS71020 EEPROM factory settings

I've recently taken over a project that has issues with the ACS71020. The values that we get are off, and the software has written to both the EEPROM and the shadow registers with custom values. My ...
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1answer
134 views

Connecting multiple voltage sensors with the STM32 Nucleo board

I want to connect multiple voltage sensors to the nucleo board. Lets say 4 voltage sensors of same kind with same address. So, I thought I could connect all the 4 sensors with the nucleo board with ...
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6answers
1k views

How to read 0 -10V analog voltage with lower voltage tolerant ADCs without a voltage divider

Background Information I want to implement an ADC as an extension to a Raspberry Pi, so that it has the capability to read analog signals. I will be using the MCP3004/3008, as I got lost in the ...
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2answers
74 views

How do I test board components when check pins are available?

edit: The expected values and higher resolution images are linked below. Higher Res Board Images Acceptable Values I am a novice at board repair. I am repairing an instrument in a research lab where I ...
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5answers
4k views

What is the voltage drop across the 10 ohm resistor?

What is the voltage drop (V1) across the 10 ohm resistor? Can I use voltage division to get V1? Like V1 = (20 V x 10 Ω) / (10 Ω + 4 Ω) But when I use nodal analysis and mesh analysis I get a different ...
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1answer
107 views

Voltmeter resolution increase by having several in series

The problem I am trying to measure quite precisely a voltage around 7.2V on a line of a PCB with a voltmeter. In this voltage range, my voltmeter only displays 3 digits. So the reading is something ...
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0answers
34 views

Is there a standalone chip/breakout to measure voltage and current to display externally

I am currently looking for a DC voltage and current meter that I can put between my power source and the load. I can find a lot of packaged products that come with a display and everything, however I ...
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0answers
34 views

Pulsed DC power calculation

I'm trying to measure the power consumption of my device using a shunt resistor. I'm measuring both the voltage over my shunt resistor and the source voltage. With a math function i'm trying to ...
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3answers
103 views

Audio Jack Safety 230v DC

I'm using a 3.5mm male to female connection (images below) to a voltage divider network to measure voltage from a solar panel with an Arduino. 230V to roughly 4V. My question is whether these ...
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1answer
70 views

How to wire a digital LED voltmeter in line with an illuminated rocker switch so the switch light is on and the meter displays the actual voltage

12v power supply to put output signal on a 7 way trailor connecter.How to wire the LED voltmeter in series with an illuminated rocker switch,so when the switch is turned on,and the light is lit,the ...
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1answer
46 views

best high pass filter topology to extract low V kHz range pulse from noisy 60Hz line voltage before daq

I need to extract a 1 kHz-10kHz range voltage pulse created by a current pulse I inject on an harmonic rich 60 Hz network and that propagates on it. The line voltage is 120V AC. harmonics 2 and 3 are ...
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0answers
43 views

Light sensor circuit

Hello for homework assignment I have to design an electric circuit which takes input from a light sensor and finds if the brightness is bigger than some value. This is what I have done so far: ...
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2answers
62 views

Measurement of internal resistance of a battery

I found two circuits online of almost same approach to measure internal resistance of a battery. Both the methods excite the battery at 50Hz using a square wave and AC voltage drop is measured across ...
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0answers
43 views

Arduino Every Nano with 3.7V Li-Po - Reading voltage

I have Arduino Every Nano and 3.7V Li-Po battery (Akyga LP903759). I want to read the current voltage of a battery using analog pin. If I use a 50 kOhm and 200 kOhm resistor (in voltage divider) I'll ...

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