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).

Filter by
Sorted by
Tagged with
0
votes
4answers
124 views

How can capacitors pass AC without or with minimal voltage passing?

My question is: How can capacitors pass AC without or with minimal voltage passing? If the current is caused by a voltage (potential) difference and current is just the voltage (or charge) passing per ...
0
votes
1answer
73 views

TX and RX on single wire

Here I am not using any RS232 or RS485 protocols. I will transmit analog square signal of -12 to +12V and also receive the -12V to +12V signal. So I have a circuit which can transmit and receive the ...
0
votes
1answer
68 views

What to do with unused open drain pins

I have a light sensor IC. I have 2 questions: The I2C Lines is connected between the microcontroller (3.3V domain) and the light sensor IC. The microcontroller is placed on a PCB and the light sensor ...
0
votes
1answer
67 views

It okay to use 12V 2.5A adapter instead of 12V 1A? [duplicate]

I have a piano keyboard that uses 12V 1A adapter . The adapter was not working anymore so i used another one which was 12V 2.5A but after 45 minutes of usage the keyboard got little heated up in the ...
0
votes
1answer
46 views

Differential Impedance Matching

Below is a small portion of a schematic which I have seen It mentions that the transmission line will have a differential impedance of 100ohms between them. In case of Single ended it would be 50 ...
3
votes
1answer
71 views

Twisted Pair input routing on PCB

I have a twisted pair input to the IN+ and IN- pins of the MAX9278 deserializers. The Parallel data output of the deserializer consists of 4 LVDS data channels and 1 LVDS Clock channel to a 3.1" ...
0
votes
1answer
31 views

reduce voltage for inverter in solar system

I have a solar system (solar panel, controller, battery and inverter). Battery have standby use 13.6-13.8V, cycle use 14.5-15V. I set the charging voltage to 13.8V. The problem is that inverter to 230 ...
0
votes
3answers
48 views

How to get started knowing how to power my robot? [closed]

I have been a software engineer for many years writing code for websites/servers etc. I recently became intrigued with the idea of building land drones. I have decided to build a small tank that has a ...
0
votes
1answer
98 views

Case fan making humming noise when used with potentiometer

simulate this circuit – Schematic created using CircuitLab When I turn on the circuit above, when the potentiometer is not at minimum or full speed, the fan makes a high-pitched whining sound, ...
0
votes
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 ...
0
votes
1answer
41 views

Power of a controlled voltage source

I'm learning a bit about controlled sources and I'm a bit confused about calculating their power. I have this circuit. Link to Falstad Simulation According to the formula for power P = U * I, I get ...
1
vote
2answers
145 views

How to stop ESP32 resetting when motor starts?

This is my first post here and I'm new to electronics. I am trying to control a motor using an ESP32 Cam. See attached image for a rather crude schematic. The power supply is rated for 2.4A. I am ...
-1
votes
3answers
80 views

STM32 ADC read methods for high voltages

I want to read input voltage from a solar array for my circuit. That's not a big deal if the voltage is up to 3.6V. The problem is that I am expecting maximum of 15V and obviously I won't be able to ...
0
votes
2answers
57 views

How is the output voltage adjusted on this schematic?

This is a schematic of TI's reference design for a 65-W USB Type-C high density active clamp flyback with GaN (PMP21639), which can be found from this reference design page. The page claims that the ...
0
votes
3answers
51 views

Do switches induce voltage spikes in the AC power grid?

I know that DC inductive loads create back EMF when turned off and that's why we use a freewheeling diode. Does this also true for AC inductive loads and AC loads in general? I know we can't use a ...
0
votes
1answer
80 views

Why can't KVL be applied here?

I was asked to find the Is current I applied KVL in that loop but my ans is wrong. what concept is wrong on my approach?Why kvl cant be applied on that loop please explain
0
votes
2answers
101 views

Voltage multiplier circuit not working

I am trying to make a voltage multiplier circuit. When I connect it to mains \$120 \; V\$, the output voltage becomes \$90 \;V \;DC\$, I do not know why this is. Capacitors: \$20 kV \; 1000 \; pF\$ ...
0
votes
5answers
130 views

How do I determine which microcontroller can help me measure peak to peak voltages for my 400 kHz sine wave signal? [closed]

I have 400 kHz sine wave signal with a variable voltage between 0 V to 5 V, and I would like to use a microcontroller to measure peak to peak voltage of the sine wave. My understanding is that the ...
0
votes
1answer
64 views

Make time auto shutoff PC fan - safe?

simulate this circuit – Schematic created using CircuitLab I am making a fan that shuts off after a minute or two, but is this circuit safe for the fan? It runs at full power at first, but as ...
0
votes
1answer
41 views

Driving 18 Thermistors in parallel

I am designing a circuit that needs to have 18 thermistors to measure the temperature at various points. The thermistors are 2metres+ away from the ADC Usually when I power a thermistors I use a Vref ...
0
votes
2answers
99 views

How does current flow in this circuit

I'm just trying to visualize how the current flows in the following circuit. It is a follow-on question from here. The circuit is a small-signal model for a common-source MOSFET with source ...
1
vote
4answers
107 views

Connecting PWM computer fan to transistor and adjustable resistor

Edit: Please do not change the circuit after the circuit has been discussed and answered. Thank-you. --MathKeepsMeBusy simulate this circuit – Schematic created using CircuitLab I'm making a ...
0
votes
1answer
51 views

Build a circuit to modify a printer's power supply

Can I in anyway build a simple circuit that would change the printers power supply to be able to power the printer in the photo? I want to convert a 22V 455mA power supply output to 16V 500mA output ...
2
votes
1answer
105 views

The relation between Vin and Vout (diodes circuit)

Can anyone here tell me if the function I found that relates the Vin to Vout is right? So I made a mesh analysis to find the current in the first mesh (left to right) and in the second and got that ...
0
votes
0answers
24 views

Deserializer Datarate calculation

I am having this MAX9278 deserializer IC. The input to the pins +IN and -IN is a twisted pair input and therefore, it is a differential signal. I have configured the CX/TP pin to low since it is a ...
0
votes
0answers
28 views

Working of Comparator and LED Driver pin function?

I have this LED Driver - A80604 I need to generate 30V for my LED Driver String for generating 300mA. My question 1 - Both pins ADIM and PWM seem to perform the same function? Both typically take in ...
0
votes
1answer
60 views

Driving multiple LEDs from microcontroller pin

I have a 12 V supply and I want to connect 4 LEDs to each pin of the microcontroller. Voltage and current of each LED is 2.5 V and 20 mA. When the output of the microcontroller becomes high the LEDs ...
0
votes
2answers
62 views

Determine a known battery's instantaneous capacity through voltage? / voltage's relation to capacity

Is it possible to approximate a battery's current (the "right now" kind of current) capacity, given its absolute capacity and a voltage measurement? An example: I have a 1s 260mAh LiPo that ...
1
vote
4answers
108 views

Why does current continue flowing in a circuit?

Sorry for the amateur question, but I'm having trouble understanding this phenomenon. In a closed circuit, electron current flows from the negative terminal of a battery to the positive terminal. But ...
0
votes
1answer
90 views

Will diode be turned on? [duplicate]

Assuming we have this circuit: simulate this circuit – Schematic created using CircuitLab Assuming D1 is a silicon diode and D3 is a germanium diode,Will D1 be turned on so the VAB = Vfd1 or ...
0
votes
3answers
79 views

Why would you protect a 120-277 LED driver with a fuse that is 600V rated

Sorry about the silly question but is there a reason why you would want to protect a 120-277V LED driver with a fuse that is 600V rated? Does that really protect the device/driver?
0
votes
2answers
92 views

How to prove that the \$3\$ nodes have the same potentials?

The question of symmetry. The each resistor has the same resistance(given by \$r\$). Why a current doesn't flows between the each endpoints of the middle \$2\$ resistors? The text book only states of ...
0
votes
2answers
49 views

What will be the output voltage graph of the following circuit if output voltage is considered across the resister?

The circuit is given below. I know that until the Vin reaches the first peak, the voltage across R (output voltage) will be 0 since capacitors draw current to charge. After that, I couldn't figure it ...
0
votes
0answers
81 views

Please help me identify this SMD component

I've got a motor driver controller, I found an SMD component that is the same component shown in the picture. I need help identifying this component. I've tried to google the part number, but no luck.
0
votes
1answer
41 views

How this equation of the voltage is attained?

I've may been asking the very easy question. The each resistor has the same resistance(given by \$r\$). The textbooks states the following. \$V_{AB}=r\{i_1+i_2+i_3+(I-i_1)\}\$ How the above equation ...
0
votes
0answers
51 views

Question on H bridge motor circuit

I just finished task 1 on my project but my teacher has not provided any good guidelines so I was just hoping if you guys could check my work before I move on to step 2 and let me know if I'm correct ...
0
votes
3answers
100 views

Diodes circuit confusion

If we have this circuit: The diode with the lowest forward voltage drop will conduct and turn on while the other will turn off and not conduct current. If I have this circuit: Assuming the 2 diodes ...
0
votes
1answer
54 views

Understanding specifications

I have a differential signal which I want to measure with a differential probe. While reading the specification of the probe, I got confused with a few terms. Can someone what the highlighted terms ...
0
votes
2answers
49 views

Zener diode simulation issue

I have this simulation issue and I don't know how to solve it: The Zener current is smaller than the breakdown current yet the Zener diode still acts like a voltage regulator. Any help? Shouldn't the ...
0
votes
0answers
48 views

What are these on the probes

I am having a Lecroy differential probe and trying to measure a LVDS signal. This is the Reference Manual which I am referring to as a guide. My differential probe tip/lead model number : DX20 - SP/SI/...
1
vote
1answer
91 views

How does mouse keep working when the battery is drained?

When battery is drained with time it provides less voltage. Which makes me wonder - how does appliance (like a mouse) keeps working with lower voltage? Is it because electrical components inside can ...
-2
votes
2answers
75 views

phase between the input voltage and the output voltage?

If I have this circuit, how can I calculate the phase between the input voltage and the output voltage (capacitor voltage)? Knowing that the signal frequency is 1kHz
0
votes
1answer
65 views

Detecting a parasitic voltage/current that differs from line frequency

I have a question related to electronics: "Someone told you that there might be a problem with the electrical circuit: In addition to the standard 50Hz alternative voltage, it mights exist ...
0
votes
1answer
54 views

Current to voltage circuit

I'm currently doing a project that consists of testing bio-implants to see if they are still good to use. For this, I have to measure the impedance of the implant from frequency starting at 10Hz to ...
1
vote
3answers
115 views

Voltage regulator output too high

I'm trying to provide a 3.3V source for my micro controller from a 5V power supply, however seem to be having issues with all the 3.3V regulators I've tried. I'm currently trying to use an MT1117-3.3, ...
0
votes
1answer
45 views

Maximum voltage divider resistances for sensing LiPo battery voltage over 10bit ADC: is MOhm range working?

I've designed a PCB that should contain as few components as possible but it should have a simple way for measuring the battery voltage using an ADC channel and a simple voltage divider. My current ...
0
votes
2answers
56 views

Rear light on vintage motorcycle 6 V split to 5 V

I have a 6 volt vintage motorcycle. With it being a 1920s motorbike, there was no need for a brake light to be attached/fitted by law just a rear light. However I am not comfortable with this and I ...
0
votes
2answers
44 views

What keeps voltage/current/power from flowing into “branch two” from the “Vout” node in the below drawing?

I need Vin to go into one of two branches and then continue to Vout, the boxes represent DC-DC converter, one at 20V and another at 15V. What keeps voltage from going through Branch 1 into Vout node ...
0
votes
3answers
84 views

What exactly is electric potential (what's wrong with my picture of it)?

In my book, the potential at a point is defined as the work done on a charge to take it from infinity to the point against the field whereas the gravitational potential of a ball is the work done on ...
0
votes
1answer
43 views

Inverter dc to ac

I want to controll electronics made for AC with DC. In the specs it says 60 volt AC and 5W. Is it possible to use an inverter for translating 60 vdc to 60 vac? Or how can I calculate this? My idea is ...