Questions tagged [voltage-drop]

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23
votes
7answers
11k views

Basic diode question about voltage-drop

We have been begun studying diodes in electronics 1 and I have really basic question that may be really dumb but I cannot find an answer online. If a diode is in series with a resistor and a voltage ...
0
votes
0answers
41 views

Boost converter voltage drop

I used both the TPS610986 and TPS61291 boost converter in order to power a load that consumes around 200mA in both situations (TPS610986 powering the load then use the TPS61291 to power the same load)....
0
votes
2answers
75 views

Confirmation on Diode in parallel with a Resistor

In a circuit with a resistor parallel to a diode/resistor, will the voltage across both resistors be the supply minus the 2v drop of the LED? Meaning you would calculate it still by using resistors ...
0
votes
3answers
103 views

Basic understanding of Voltage drop

What is the second/lower 15 k-ohm resistor for? I understand why there is a 12 k-Ohm resistor in the top, that's for the V-out. But why is there a 15 k-Ohm resistor in the lower right? Why would you ...
0
votes
1answer
58 views

Could a resistor work as well as a signal diode in this level-shifting circuit?

The following hackish circuit uses the internal circuitry of one "sacrificial" WS2811 LED to level up the logic voltage to 5V for the remaining strip by placing a signal diode in series with the power ...
0
votes
2answers
37 views

Calculating voltage drop (and power requirements) for multiple devices

I am trying to calculate the power supply required for 3 cameras (1A each), each with 150 metres of cable (0.75mm2), connected to a common power source (AC-DC PSU). I have done these before with ...
0
votes
1answer
33 views

Confused about Kirchoff's voltage law and voltage drops

I am a beginner student in electricity and magnetism. I have troubles understanding the physics behind it and so have found myself stuck with this: Kirchoff's voltage law, as I understand it, says ...
0
votes
0answers
83 views

What is dropping all this voltage in a circuit with just a heating coil?

I have a heating coil (actually an e-cigarette vaporizer) that I soldered two 10cm wires to. If I hook it up to a regulated 5V power source and measure the voltage over the coil, it measures about 4....
0
votes
2answers
63 views

Why does the voltage drop when connected to loads and what's the solution? [closed]

I have thermoelectric modules and set it in series, then I connected to a DC to DC step up (CN6009) to enhance the voltage. Then I connected to my phone with usb charger to try charge with it, but the ...
6
votes
3answers
644 views

Simplest way to reduce voltage from ~48v to ~36v

(I'm very much a beginner with electronics, so I apologise in advance) I’m trying to use a 48v battery on my 36v ebike controller. The controller itself can deal with the higher voltage, but it has ...
0
votes
1answer
58 views

1602a LCD - Voltage drops to zero when both VSS and VDD are connected

I'm currently trying to connect a 1602a LCD screen to an ATMega328P MCU: As you can see, I use an Arduino Uno for power supply and as ISP. However, when I connect both the first (VSS) and second (VDD)...
0
votes
2answers
90 views

Why is voltage across LED filament bulb slowly decreasing?

I'm trying to power this LED filament bulb with a 12V - 2A DC wall adapter. LED specs: rated at 4W 12 to 24V input I'm pretty new to this, but if I get it right: Calculus the LED bulb will draw ...
-4
votes
2answers
91 views

What resistance is required to drop 12v 11A DC to compleate 0v? [closed]

Let's not lie. I'm a big fan of LEDs. I have about a meter long strip (3.2W) plugged to a computer power supply through connector capable of supplying 12V and 11A. I was about to buy a 10k Ohm ...
0
votes
3answers
244 views

Voltage Drop due to inrush current

When an air-conditioner is switched on, light bulbs in the house flicker a little. I was told that this is due to the inrush current of the ac. I am assuming that voltage drop is causing the ...
1
vote
4answers
110 views

Does resistance decrease over a resistor?

If ohms law pertains to voltage, current, resistance across a resistor, in order for voltage to drop, and current to remain the same, does resistance drop as well across the resistor? To explain what ...
0
votes
0answers
33 views

Voltage Drop - Sizing Feeders

I am reviewing a value engineering proposal consisting of downsizing the main feeders to the moveable bridge. for the voltage drop, they calculated the total current draw for the worst case scenario ...
0
votes
1answer
49 views

What additional factors need to be considered when calculating voltage drop?

Considering the following formulas for voltage drop, what additional factors need to be included and how can resistance be derived to thoroughly calculate theoretical voltage drop for multiple ...
3
votes
4answers
921 views

How to avoid voltage drop when using full bridge rectifier as reverse polarity protection

I found a couple of old bridge rectifiers. After reading some docs and tutorials about reverse polarity protection decided to give them a try. The problem is nobody offered a solution against the ...
1
vote
1answer
77 views

Mitigate voltage drops when using a relay

Hi and thank you for reading my question. I have a small experimental solar panel setup which charges a deep-cycle battery using an MPPT converter. I would like to power some garage and garden lights ...
1
vote
2answers
153 views

How to add 0.2V per Ampère that device draws? (Voltage drop compensation)

I have noticed that many mobile phone chargers already do this: For each 1 A of current that the mobile phone draws, the charger's output will be increased by 0.05V or 0.1V or something similar, to ...