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Questions tagged [voltage]

Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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Is a capacitor a memoryless system?

According to my textbook, A system is said to be memoryless if its output for each value of the independent variable at a given time is dependent on the input at only that same time. It also gives ...
lefty's user avatar
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5 votes
2 answers
192 views

What makes a MCU capable of higher temps than another?

Just an example - STM32F722 has a few versions, but I'm talking about just the variance between two numbers: RET6 vs RET7. The former has a max operating temp of 85C, whereas the latter says 105C. ...
KpilotRCHelis's user avatar
-1 votes
1 answer
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5V on DP and DM pins on FT232RL?

Can I apply 5 volts to the DP and DM pins of the FT232RL, given that the technical sheet says that the maximum voltage of these pins is up to 3.8 volts?
Gerasim Neshovski's user avatar
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0 answers
96 views

Getting 12 V from original 20 V of PSU in Vintage Arcade Cabinet

I have an old Italian Arcade Cabinet which is a clone of Atari Scramble. The game name is Explorer and was made by sidam. I am in the process of adapting this pre jamma cab to jamma so to use a ...
Chris Nuvoli's user avatar
4 votes
2 answers
923 views

Why does IPC 2221 require so much more spacing at elevation?

In the IPC 2221 is a table that specifies the required trace spacing. One thing that I find very surprising is the jump once the elevation is above 3050m. E.g. For an external conductor (uncoated) at ...
Lucas's user avatar
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2 votes
1 answer
67 views

Why do I have to increase the current by 2V when I am using a transistor?

I have a 3V 3W LED, which I would like to control with an ESP32. For controlling the LED, I have chosen a TP122 transistor. Here is my 'schematic': (The Arduino is an ESP in real life, and the 3 V ...
Marci's user avatar
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0 votes
1 answer
64 views

Can I get the internal resistance of a capacitor from the voltage, capacity, and construction type?

I have a model of a system and I'm trying to use gradient decent to find a locally optimal solution. One of the variables is the voltage of the capacitor. I think I'll be using a film capacitor, ...
Joseph Summerhays's user avatar
0 votes
2 answers
54 views

Connecting Two 24VDC Power Supplies

I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
Dylan Mc Loughlin's user avatar
1 vote
1 answer
49 views

Multiple voltage source problem from Boylestead

Good day I'm doing this problem from a textbook and I cannot understand how they got the answer. So I have to determine the voltages Va, Vb and Vab. There is a process to do this that I don't think I ...
Bucephalus's user avatar
-1 votes
0 answers
67 views

How can I get 110 dB from a 10 or 15 mm piezo?

I’m trying to get the loudest sound possible out of a 10 or 15 mm piezo. I got 120 dB from a 20 mm piezo with 12 V but hoping to get the same sound from a smaller size. Any suggestions?
Mary 's user avatar
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4 answers
128 views

Why is the power conserved in a phone charger?

Most phone chargers draw 220V 50mA (for example) from the socket to inversely proportional draw 5V and 2.2A (in its converter) to charge the phone at 2.2 A because power is conserved. Why is power ...
Moreless's user avatar
-1 votes
2 answers
128 views

Why does a 230V 16A socket supply only the needed current to loads? [duplicate]

If I connect a 150W laptop charger to a socket that supplies at home 16A 230V, it will only draw the necessary amperage needed for the laptop charger at 230V. Why? Why doesn't my charger simply draws ...
John Mary's user avatar
-1 votes
2 answers
95 views

Which one will turn the ceiling fan faster? Current, voltage, or power? [duplicate]

Which one of these things will turn faster the ceiling fan? Is it the amount of electrons by unit of time passing through the engine, so is it current? Is it voltage, or is it the two that makes the ...
Moreless's user avatar
0 votes
2 answers
85 views

Circuit that offsets input voltage to exactly 0 V

I am looking for a (op amp) circuit to offset \$f(x)= \log(x)\$ always to zero. More comprehensible is the explanation on the x-y plot below. Basically, it is possible to offset the voltage with an ...
Andriy S's user avatar
1 vote
1 answer
63 views

Finding the correct power input for a battery pack powered device [closed]

I want to find the correct input voltage and current a device needs so that I can replace its battery pack with wired DC power. I suspect it's what it says on the device itself and not on the battery ...
E-71's user avatar
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0 votes
1 answer
53 views

Why would changes in the impedance of a transducer affect the voltage displayed on the oscilloscope?

In my setup, a function generator is connected to an amplifier that drives a transducer. The amplifier output is connected to both the transducer and an oscilloscope via a tee connector. I do not ...
UltrasoundNeuro's user avatar
1 vote
1 answer
22 views

Why is there a sudden drop at the rest initial point after discharging? (trying to find IR Drop of LIC)

I'm trying to get IR drop of one of my LIC cells. After discharge, at the initial point of rest, I believe there should be a sudden increase in the voltage due to resistance. Does anybody know why is ...
Kyu Dooo's user avatar
1 vote
2 answers
112 views

How do transmission lines carry low current but high voltage? [closed]

In the image below, you can see the transmission line connected to transformers and current and voltage is transferred from the generating power station at P=IV. Lowering the dissipation of heat or ...
ThreadBucks's user avatar
-1 votes
1 answer
52 views

I keep getting error in Proteus. The project is a dual power supply [closed]

...
Adejire Adegite's user avatar
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0 answers
50 views

Periodic Voltage and Current Fluctuations in Autonomous Robot System

I have an autonomous robot system powered by a 24V LiFePO4 battery that has several distributed PCBA's getting their power from the 24V battery, and also having their own on-board DC-DC buck ...
Sam's user avatar
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1 vote
0 answers
65 views

How to generate a 50-100 Hz 12 Vac sine wave for audio tone from 5 VDC (PB0 pin) atmega164p microcontroller [closed]

I have programmed to ATmega 164P to make PBO high when PC1 is low. In programming, I'm adding other peripherals as well. But I am facing one issue regarding generating a tone. I have drawn low pass ...
Traffic t's user avatar
0 votes
3 answers
83 views

How can I calculate a transistor's IB, VBB and VEE from the given information? [closed]

I'm new to using transistors, and struggling with a problem that resembles this: As you can see, we have a few known variables: VCC is 5V IE is 20mA There are also some variables with a range: IB ...
Steam Ranger's user avatar
2 votes
2 answers
83 views

How to increase trigger voltage level (with zener and small RC values)?

I am using a MIC5014 to delay-start powering a load. I want to give it a delay of power-on of about 2 seconds. I see that Vin threshold to turn on is ~1V. The limitation I am thinking of, is that I ...
Christianidis Vasilis's user avatar
0 votes
2 answers
91 views

Cant figure this out [closed]

Below circuit pulled from homemade-circuit.com, Practical Voltage Regulator Project with Feedback for Enhancing Output Accuracy, https://www.homemade-circuits.com/simple-voltage-regulator-circuits-...
hhsting's user avatar
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0 votes
4 answers
157 views

Should a diode be placed between the output of voltage regulator and the battery?

When applying constant voltage to a 8-volt lead acid battery using a 7809 voltage regulator, should a diode be placed after the output pin and before the battery, anode to the output pin and cathode ...
SA A's user avatar
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1 vote
1 answer
87 views

Increasing voltage from 5 V VCC (i.e. logic HIGH) to 12 V during operation

I'm working with a handful of NOR flash chips that have a write protection mechanism where the memory can't be written to unless the blocks are unprotected. Evidently, unprotecting them requires the ...
Steve's user avatar
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2 votes
2 answers
479 views

How to Adjust Comparator Output Voltage for Circuit to Work at 3.3V Instead of 5V?

I recreated the IR LED/Photodiode circuit shown in the Circuit Digest article Interfacing IR Sensor Module with Arduino. My interest being to use it to sense/measure RPM of rotating equipment. The ...
David C. Rankin's user avatar
0 votes
1 answer
120 views

Fixing the voltage leak on a soldering station - What should be done? [closed]

I found a soldering station Aixun T3A on youtube that got a very positive review. The review said: High temperature accuracy Fast temperature heating speed Low temperature overshoot High power ...
euraad's user avatar
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0 votes
1 answer
50 views

Is it safe to use a battery charger with an output voltage higher than the battery voltage? [closed]

I apologise in advance for any erroneous or obvious points or terms I may use. I have a Remington beard grooming razor, which originally contained a 1.2V 700mAh NiMH rechargeable AAA battery, which ...
jimjamz's user avatar
0 votes
3 answers
70 views

Does the rise time equal the decay time in a DC LR circuit?

The time it takes the voltage to decay from its maximum to zero after the switch is closed is ≈5\$\tau\$. I was wondering, does the same applies during de-energizing, i.e, when the switch is connected ...
Jack's user avatar
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0 votes
1 answer
37 views

Voltage in the transmission line

In a power transmission line, the voltage at any point in the transmission line (along the length)is said to be the sum of the incident and reflected wave components of voltage. And if it is such then ...
Jina's user avatar
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0 votes
1 answer
122 views

What is the difference between a 225j 400V capacitor and a 105j 400V capacitor? [closed]

I am trying to build an AC to 12V 1A DC power supply.
MMNZ's user avatar
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0 votes
1 answer
103 views

When increasing the frequency of an induction motor can't I just add a capacitor to maintain torque instead of increasing the voltage?

When increasing the speed of an induction motor if one wants to maintain the same torque, the voltage has to be increased at the same proportion as the frequency of the AC supply. This is because the ...
Jaguar31's user avatar
0 votes
1 answer
71 views

What is the max voltage I can apply to an electromagnet? [closed]

I have a small Amazon Electromagnet 4 ohms of resistance and wound with 110 feet of 28 AWG lacquered wire. What is the maximum sustained voltage I can put through it?
Collins's user avatar
  • 21
-2 votes
3 answers
325 views

Why does a half-bridge amplifier output half the voltage?

From a hobbyist's perspective, I can't/don't understand why the amp output voltage is only half of the supplied voltage. I am wondering if there is a trick to overcome this. This circuit schematic ...
Tintin's user avatar
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0 votes
1 answer
27 views

Supply voltage of BLDC motor increases during operation

I need some clarity on an issue I have been encountering with my BLDC motors.I am using 2 integrated driver BLDC motors to drive an RC truck sort of device, they run on 24v. For the most part it ...
Aman P's user avatar
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0 votes
0 answers
34 views

ESP32 getting brownout!

I have designed a fan controller circuit using esp32. The circuit was working when I connected with a bulb. When I connected with a fan the chip is getting turned on and immediately it turns off. This ...
Aakas Pulikkal's user avatar
-1 votes
1 answer
79 views

How does an AC of 5100W (1.5 ton) capacity work without any issue with 1000W of total electricity load of my house? [closed]

I have one AC of 5100W (1.5 ton) capacity and I generally run it along with other appliances like fans, LED bulbs, TV and more. My house is sanctioned ...
NSPratik's user avatar
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2 votes
1 answer
290 views

How does this boost converter circuit work?

The circuit appears on this site in Post #45 by Michal Podmanicky. It is posted so that I can understand how the circuit works. It is not explained fully in the posted link. How does this circuit ...
hhsting's user avatar
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0 votes
0 answers
41 views

measuring NI 9215 for measuring pressure using pressure transducer

I need to measure pressure using pressure transducer with output of 0-10 V & 0-10000 psi range and NI 9215. How could be the code?
omar abdelhameed's user avatar
0 votes
2 answers
75 views

Is it possible to have high volts with low amps? [closed]

Can you guys give me some example situations where you would have 200-10000++ volts but less than 0.031 amps? Is it even possible? If not, why? Thanks. edit: I just realised, police tasers. But ...
llVIU's user avatar
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0 votes
2 answers
87 views

Overshoot in LC Circuit Exceeding TVS Diode Breakdown Voltage

I'm currently troubleshooting an issue with two circuits involving LC components and TVS diodes. Both circuits are designed to ensure the output voltage (Vout2 for the first circuit and Vout3 for the ...
Firas Abd El Gani's user avatar
0 votes
2 answers
82 views

Can I use a 120VDC Power Supply to power a device that needs a 120VAC power supply?

Can this -> https://www.amazon.com/gp/product/B0B771K1YL/ref=ewc_pr_img_1?smid=A1JTMEV1RY2RCR&th=1 Power this? -> https://assets.omega.com/pdf/process-heaters-and-coolers/duct-heaters/...
EngineerDad's user avatar
0 votes
0 answers
18 views

Voltage drop of each load in the radial network

How do you find the voltage drop and external loop impedance of each lighting load in the picture attached?
Chukwuma Collins Ezenyinwa's user avatar
0 votes
2 answers
67 views

How is the ground node location decided?

I'm very new to electrical engineering, and would like help in understanding how a node is decided to be declared as a ground node. Does the location of the ground node matter, and cause circuits to ...
RetroBoltDev's user avatar
2 votes
3 answers
934 views

Why does a line-tester glow more when I touch the steel door frame?

I reassembled my line tester, and it was then that I got to know how it actually works. I know that when someone touches the metal part at the top, the neon LED inside glows. However, I have seen that ...
Awais Saeed's user avatar
1 vote
2 answers
73 views

Are multiple SMD Chip Resistors in Series as Safe as a Wirewound Resistor for Mains Voltage?

I realize SMD Chip Resistors are not recommended for Mains Voltage and it's no wonder since their maximum voltage rating is lower than 100 V. I also understand that WireWound Resistors are recommended ...
Dinis's user avatar
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0 votes
2 answers
106 views

BJT circuit questions

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the ...
hhsting's user avatar
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0 votes
1 answer
95 views

How to keep the voltage of an LED constant while using a MOSFET as a switch?

I need help with a project involving an Arduino and a high-power LED. I am using a MOSFET as a switch to control the LED, with the gate of the MOSFET connected to the output of the Arduino. The ...
user3369353's user avatar
0 votes
3 answers
79 views

Error measuring the voltage with a multimeter?

When testing my batteries, I wanted to test the battery on my multimeter without taking it out because I wouldn't have other new 9v batteries if I did. But, it just displayed a 1 (which means an error)...
Andy K's user avatar
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