Questions tagged [voltage-drop]

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Is it possible for the voltage drop across the depletion region in a diode to be more than the actual biasing voltage?

We know that there will always be a net current in the circuit between the two terminals of the forward biasing voltage source, however small the forward biasing voltage is (see @jonk 's comment). ...
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86 views

the sound from the coil when the current is drawn

I have buck-boost converter using a TPS630250(4.2 ->Vin) - (3.3 -> Vout) in my PCB. This buck-boost converter can draw max 4A in buck mode and max 2A in boost mode. While there is no load or ...
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2answers
60 views

Large voltage drop across source terminal

I am using an N-channel MOSFET to enable another IC. My gate voltage=1V, the drain voltage=3.3V. After rigging up the circuit, the voltage across EN_DC23 was measured with reference to ground and it ...
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79 views

Measuring voltage drop across 10 ohm, 100 ohm and 10 kilohm resistors (one at a time) - very simple circuit

Below is a picture of my very simple circuit. There are three resistors 10 ohm, 100 ohm, and 10 kilohm. I connect them one at a time in serial fashion and measure voltage drop across them. When I ...
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65 views

Why is the voltage drop over my MOSFET so large?

I am trying to use an NCV8403B N-channel power MOSFET to control the power for my circuit. The schematic itself is quite simple: The MOSFET is controlled by an SPST switch. When in the ON position, ...
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76 views

How to limit current for a transformer?

So I've been winding and unwinding, all to get the current right but it's not going well, so I'd like to know how I can limit the current going into the primary side of my transformer, since the ...
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1answer
73 views

How to calculate the voltage drop in this case?

I started with the superposition principle. For Vcc, Ib is open circuit and Eg is shorted. I got that the voltage drop due to Vcc is 10000/3 V. For Ib, Eg is shorted as well as Vcc. Since Ib is dc ...
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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 ...
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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.
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43 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 ...
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1answer
56 views

House refurb rewire - low current?

So we've been renovating (virtually new everything) a 1930s semi that hasn't been modernised since it was built and hadnt been lived in since the 70s. Naturally a full rewire was high on the agenda ...
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59 views

How to componsate for long power lines voltage drop

I have implemented a simple backup LED system. The system comprises a 12V 3.2A power supply, a small DB fuse box, and a 12V LED strip. The system is working as expected. However, I noticed there ...
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43 views

What factors affect the voltage drop in a basic ac generator when an additional load is added in parallel

As a preface, I am in school to become an engineer on a ship so my question relates to a self-contained circuit/grid and not a home. We are going over generator theory and how an automatic voltage ...
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2answers
72 views

Understanding voltage drop on a transistor

I've been reading different answers online and am trying to get my head around calculating transistors. I have a circuit like this: (Imagine the base goes to a microcontroller and is connected ...
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34 views

Drop 12v down to 6V [duplicate]

I want to power 3 x 12v 0.2A PC fans from the Molex power supply on my PC PSU, the only issue is that I don't want them to run at full speed. So I am trying to half the voltage to 6v. I have built ...
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43 views

Fixed voltage drop (current and temperature independent)

simulate this circuit – Schematic created using CircuitLab Is there a clever way to create a fixed voltage drop say 2V that is not affected by current or temperature? Voltage stability should ...
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1answer
43 views

about the high voltage capacitor found in charger circuit

A while ago i have opened an electronic balance charger for a reason to try understanding how the circuit works so I've drawn the entire circuit for that purpose but i no longer have the drawing, but ...
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2answers
83 views

Voltage drop when connecting DC-DC booster XL6009 to my solar panel generating 10V constant

I have connected my solar panel (rated 6 V 3 W,) but it is generating approximately 10V. This 10V is fed to an XL6009 to generate ~15-166, which is further fed to a 4S BMS to charge. I checked that ...
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119 views

Voltage drop on lithium batteries

Is there a difference between having one big battery vs 2 batteries in parallel? I am building a "fan controller" and want to power a 12V fan with a lithium ion / polymer battery. The ...
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1answer
57 views

Where voltage is lost in an emitter follower?

I'd wanted to know what happens in an NPN emitter follower with \${\delta}V=Vcc-Vee\$. At which junction does voltage drop? May this drop be fatal to a transistor?
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1answer
86 views

Dramatic voltage drop issue

I'm using this circuit design: Link to original project page with schematic on EEVblog forum I changed some values: R1:220 ohms R3:470 ohms C1:470pF M1: TIP41C. When I turn the converter on and ...
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2answers
87 views

AC-DC Powersupply voltage drop

I just bought this power supply for a project. I just went in with a multimeter to test the voltage and pins, which gives me a 20V reading as expected. However, after I remove the power supply from ...
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3answers
77 views

Voltage drop problem. Transistor, optoisolator, relay for programmable Christmas lights?

I'm trying to create programmable Christmas lights - a very simple circuit controlled via Arduino or NodeMCU. My problem isn't on the microcontroller side, but the basic electronics. Now... I have 2 ...
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2answers
168 views

What is the best way to parallel two shunt resistors using a switch?

What kind of switch in place of SW1 will have minimum amount of error in current readings? Max current is 10 A and we should be able to control the switch digitally. simulate this circuit – ...
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95 views

Switching on DC to AC converter large voltage drop

[![Current pulse at source of PMOS][1]][1][![Test across inductor with 470ohm at gate of PMOS][2]][2]I am trying to switch on a DC to AC converter, the load for the primary side of the circuit (where ...
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1answer
84 views

Pulling down positive voltage to limit negative voltage current

Below circuit is the negative rail of a dual tracking power supply. How do I detect voltage drop on Node1 and pull down Node2 to limit the current without using an op-amp? Edit: I just want to define ...
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5k 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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3answers
154 views

When can I neglect the voltage drop of diodes in a circuit? [closed]

Let's suppose a Rectifier with Vd,on=0.7 V is connected to a sin-voltage source with Vamp=10 V. When in this case of forward bias can I ignore the voltage drop of the diode? Or is it only possible if ...
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1answer
65 views

Power dissipated between two points

In the follwing, if the power dissipated between a and b is 210 watts, what is the value of Vb?
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87 views

Maintaining constant voltage at end of long wire

I have a long 1 mm wire, about 1.5 meters long (and 1.5 m back). At the end of a wire I have a device that requires 3.7 V and can pull anywhere from 0 to 6 A at a time. However, when it pulls a high ...
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1answer
131 views

internal resistance of inductor effect

I'm trying to analyze an RL Circuit . I saw this equation for voltage drop over an inductor: V = L * di/dt But what about internal resistance of the inductor ? I ...
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2answers
252 views

Suggestions for dropping resistor on LM78 regulator

I’m trying to repair a magnetic stirplate (see http://staff.washington.edu/wbeaty/chem_stir.html). I found that in one part of the circuit it fails to deliver 12V. I’ve draw part of the circuit below: ...
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44 views

Prevent Raspbebrry Pi reboot from brief voltage interrupt using capacitors

My goal is to power a Raspberry Pi Zero W using an IP5306 charging IC which would receive its power input from a 3.7v 18650. The Raspberry Pi Zero requires 5V and can draw as much as 120mA without ...
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36 views

Is power calculated using source voltage or load voltage?

I am making a power meter that counts the mWh over the course of a battery discharging. I am using an arduino and an INA219 current shunt module. When the load is connected, the load voltage reported ...
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3answers
84 views

Cause a voltage drop of about 1V

I am currently working on a battery powered project (4 x AA rechargeable batteries) with an Attiny (max vin = 5.5V), which works perfectly so far. But if I would insert normal batteries into the ...
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59 views

NDP6020P P-Channel MOSFET + ESP8266-01 Voltage Drop

I'm trying to power a ESP8266-01 with a NDP6020P. My main power supply is a buck converter configured at 3.6V. I connect the NDP6020P source to 3.6v and the Gate to Ground. If I calulcate the Drain ...
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10answers
6k views

Voltage drop across a single resistor and across two resistors

I have been having difficulty understanding voltage drops across resistors. Now, I know the theory and how to apply Ohm's law. The question is why does the voltage drop across resistors of the same ...
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1answer
93 views

Toroidal transformer voltage breaks down

I am having some trouble understanding the behaviour of my toroidal transformer. Currently, I am using a 400V to 12V transformer in reverse, meaning I supply 12V and around 1.5 A to the secondary side ...
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2answers
694 views

voltage drop across ideal diode

Both diodes are ideal, can we find what is potential drop acoss each diode in this situation, if yes what is potential difference across each diode
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108 views

Reduce voltage before LDO

I am working on a remote gate opener setup. It will be powered via a 12v battery (12-13.5v) and charged via pwm solar charger at up to 14.5v. I would like to use the HT7333 LDO datasheet here It has a ...
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2answers
517 views

How to wire LED strips into my display cabinet?

Let me start by mentioning that I have little knowledge in this field. LEDs I have: 12v 1Meter Rigid Double-row 3pin LED strips with 1.8A total draw (0.9A each row). For some reason, they have massive ...
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0answers
45 views

DC Supply voltage drop in a Schmitt trigger circuit

I developed a Schmitt trigger using IC NE555P. I supplied a Vcc of +6v from a DC source. My input is a sinusoidal wave (peak-peak = 4V). First I set the voltage in DC source (+6v) and when I connect ...
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1answer
69 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
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2answers
58 views

Valid circuit to drop voltage?

I needed to drop the voltage(5V -> 4,2V) for a small IC(consumes ~2A peak), and used what I could find laying around. Is this a valid way for dropping the voltage? The resistor turns very hot, but ...
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200 views

Voltage drop of a PWM signal

Hello so i have a microcontroller that is driving the following circuit: Both the MCU and the circuit are powered by a 5v power supply, when PAD_PWM and PAD_PWM_return are not shorted ore there is no ...
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2answers
107 views

Fuse Circuit Using Transistor (Working)

I came across one circuit for making fuse using transistors. In the circuit my doubt is how the voltage is dropping across Q2 when I changes the load resistance value (hence current). Usually the pnp ...
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3answers
171 views

Why can't I get transformer output as written on the label?

TLDR: I've made a short video about this, if you like looking at a video more than reading this. It's here: https://youtu.be/51235iFywI4 The problem is pretty straighforward. I have a (toroidal) ...
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6answers
3k views

Understanding voltage drop

Meanwhile in quarantine I been trying to learn about electronics. I am still not able to understand the voltage drop when it comes to long wires. My goal is to be able to send a 5v signal over a very ...
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1answer
78 views

Voltage drop with diodes

I have a battery case with a built-in led bar battery level indicator. The case was made for a 36-volt battery, but I will be using it as a 48-volt pack. I would like to drop the voltage to the ...
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1answer
168 views

Big voltage drop across MOSFET with LED strip load

I'm trying to power up a Giderwell RGBCCT LED strip using ESP32 (a 3.3V microcontroller) with the help of an IRL540N MOSFET. My circuit looks like this: (sorry for the amateurish/nonstandard diagram,...