Questions tagged [parallel]

More than one of a thing, performing the same task simultaneously

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Multiple LEDs with reed switches for testing magnet placement

I'm adding MIDI to an old electric organ (saving the existing internals for dual operation). I will be using reed switches and magnets at every key for action. For testing magnet+reed positions I ...
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Battery Charging with Two Constant Current Power Supplies in Parallel

first time asker so be gentle if this is dumb. I'm using this LED Driver (constant current, output range 143-286v) to balance charge a high voltage hybrid vehicle battery at very low current, and it ...
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Design calculations for LVDC grid

I'm looking to use 60 V to create a small LVDC grid to power up some small loads - 12/24/48 V maximum. For the purpose of this question I will assume 12 V only loads. 60 VDC will be the power supplied ...
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Reading from CFI registers always fails - Parallal NOR Flash M29EW

I'm trying to interface a 1Gbit Parallel NOR Flash (M29EW) to my MCU (STM32L552ZET). The FMC was setup for 16-bit access/26 address lines. Also, this was done on a custom board. No jumper wires, no ...
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Is it safe to use this arrangement of charging NiMH batteries in series and then using them in parallel

I have built a solar charger that charges 6 AA NiMH rechargeable batteries in series using a constant current source at a little under C/10. That part is fine. I want to use the batteries to power a ...
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Effective resistance integrator circuit

I've encountered the following circuit and I'm puzzled about the effective resistance that the opamp will see. I know that R1 is in parallel with R2+R3, so this would be easily answered by R1*(R2+R3)/...
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Can batteries be connected in parallel then in series then in parallel again?

I'm planning a modular and swappable battery system where each module is for example 12S2P (2 parallel Li-Ion battery connected in 12S.) Can I connect two 12S2P modules in parallel making it a 12S4P ...
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parallel boost converter for more current [duplicate]

I have a boost converter that takes 3-5V at input and outputs a steady 5V (This one : https://aliexpress.com/item/33046073847.html). I plugged it to my 18650 battery cell so that I can power an ...
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Series and Parallel Capacitors in Circuit Analysis

In the circuit below: I performed my calculations considering: $$\frac1{C_{eq}}=\sum_{k=1}^N C_k^{-1},$$ and $$C_{eq}=\sum_{k=1}^N C_k,$$ when the capacitors are in series and when they are in ...
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Charging only the first battery in a series

I have a series of three 3.7v 600mAh LiIon batteries powering a ca. 12v circuit. Currently, a DPDT switch rewires them into a parallel configuration when I charge them–each battery with its own ...
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How to wire multiple LED lights to an AC outlet

I am trying to do an arts and crafts project (from this tutorial: https://www.youtube.com/watch?v=D5LjGFkpApw) But instead of using a battery pack like he is in the video I would like to plug the ...
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Parallel RLC Circuit with DC voltage source input

I am new to LTSpice and I am trying to simulate an RLC parallel circuit with a DC source. The ideal switch is initially open and then closed at t=0+. The input is an ideal DC source with 1V. I have a ...
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How to find the voltage on each of the parallel resistors? [duplicate]

Suppose we have a circuit like this: It is easy to find the voltage on the node shared by the two parallel resistors, we simply have to find their equivalent resistance and use KVL. But the problem ...
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Feeding 12V into a powered down power supply

I have a solar battery backup system that I use when there is no power to run my transceivers. Currently, the process of switching over from the power supply's 12V power rails to the 12V output of the ...
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Can simple DC/DC linear regulators be used in parallel?

Can linear regulators such as the L7805CV (Rated at 5V output, 1A max) be used in parallel? I need to create 5V from 12V, but I need more than 1A, so a single regulator won't do. Can they just be ...
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Connecting class 2 power supplies in parallel

I am looking to connect multiple rails in parallel to increase current of a class 2 power supply (UL1310). Each rail would have its own OCP (12V 8A). The problem I am having is that when talking to ...
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One of four MOSFET in parallel heating too much

I am doing an electronic load project in which I need to work with four MOSFETs in parallel working in the ohmic region (not switching). I have a good heat sink. Furthermore, only one of the four ...
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What is the reason to connect 4 resistors of the same value as 2s2p? (image)

There are 2 parallel branches, each has 2x 10R resistor. It seems to me that the resulting value will be 10R, but I can't wrap my head around why would someone do this if it is not meant to dissipate ...
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12 V / 24 V power using series & parallel circuit of 12 V batteries. Is this viable?

Is this a viable layout? The 12 V system is for everyday use on a boat. This boat system is 12 V. The charging is to the 12 V system. There is no permanent 24 V system. The 24 V would only be used ...
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Wire Size for 400AH (2 @ 200ah) battery bank with 4000w inverter?

I have 2 12v 200AH Renogy batteries I’d like to create a 12v 400ah battery bank from. I am trying to figure out what gauge of wire to use for connecting these batteries together in parallel. My ...
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Using resistor with 110 V LED indicator to make current measurement between 50 - 70 mA

I need your guidance with the V=IR formula. It's probably a simple question but I don't have an electrical background. I am working on making an LED simulator panel for railway signaling interlocking ...
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Weird speed issues with brushed DC motors in parallel?

So I have a simple system where I want to run eight large DC brushed motors (for wheels) in parallel, which should give them all the same voltage, and they should independently change rpm depending on ...
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Diode and resistor in parallel

I was recently investigating a model of a circuit in which there is a resistor in parallel with a forward-biased diode. Why is the current passing through the resistor dictated solely by the forward ...
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What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?

FINAL UPDATE A reassessment of my power consumption has led me to the solution to all of my problems. I picked up a 5V, 5A power supply (giving me plenty of overhead), reassembled my project, and it ...
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When taking into account ESR, the effective capacitance of parallel capacitors is not the sum of discrete capacitance?

I am trying to simulate the frequency response of a buck converter's control loop. The vendor's simulation tool is pretty limited and can only include one output capacitor. Therefore, I am trying to ...
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Switching between SD cards connected in parallel

I got an old device that uses an SD card that's not easily accessible since it's all in an enclosed box. It only has one slot. What I was intending to do was create a custom PCB and parallel the SD ...
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Laplace Transformation: Determine the current through the inductor versus time i(t)

simulate this circuit – Schematic created using CircuitLab I am trying to find the current through the inductor versus time i(t) using Laplace transform. Converting everything into the s-domain: ...
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Using nichrome as a conductor?

Can we use nichrome as a conductor by connecting it in parallel with a small resistor such as 1 ohm resistor to lower its resistance?
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Paralleling common mode chokes

Regular chokes can certainly be used in parallel so that multiple smaller chokes with a lower current rating can be used. But does this also work for common mode chokes? I would assume that ...
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Should an older battery be placed in a specific position of a parallel array?

4 100 aH AGMs, identical model 1 is about 8 months old that has not been though a full discharge cycle 3 are recently purchased Does it matter where in the parallel array the older battery is placed?
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How do I recharge five 18650 cells in parallel?

I have a 5P1S configuration using 18650 cells, embedded in an LED project. I have installed a TP4056 to charge 5 cells in parallel. Now I am realising the TP4056 is for single cell use. So I don't ...
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How do you calculate total current draw in parallel?

If I have a 12V power supply, a 6A TEC, and a 0.15A fan running in parallel, how do I calculate total current draw?
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Is it possible to connect a linear and a switched-mode power supply in parallel?

I'm working on a project and I need to power some RGB LED strips; three strips that need 12 V, 5 A each. The thing is that I have one switched-mode power supply of 12 V, 10 A and some 12 V, 5 A power ...
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How are "async/sync" and "serial/parallel" communications related?

I think "async/sync" and "serial/parallel" are orthogonal concepts. There can be 4 combinations of communication types: async serial sync serial async parallel sync parallel From ...
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Is it okay to assemble Li-ion cells all in line (series and parallel)?

Could there be some practical issues when operating a lithium-ion battery pack that consists of cells all in one line? (for instance, at a +/- series connection, individual cells within the first ...
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2 answers
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Why does placing multiple bridge rectifiers in parallel reduce the voltage drop?

I noticed when you start running these KBP310 bridge rectifiers in parallel the Vf goes down. From 0.998 V for 1 to 0.900 V for X4 bridge rectifiers together. Why would that be? Also, I was thinking ...
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Purpose of large resistors parallel to LEDs in a LED row?

I have a strip of 9 V LEDs. Every one of them has a 200 kΩ (204) resistor in parallel. What is its purpose? EDIT: EDIT 2: Power supply and controller PCB Works with 220V AC. The two ICs on the ...
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9 votes
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Purpose of Zener diode in button

I’d like to understand if this is just iPhones or basically most of buttons have a Zener diode connected in parallel. What is the purpose of the Zener diode in the button here? What does it do in ...
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Root Sum Square (RSS) tolerance of parallel resistors

I am trying to figure out the formula for RSS-ing two parallel resistors, but for the life of me can't figure this out. For series resistors it is easy, just $${R_1 + R_2} \pm \sqrt{ dR_1^2 + dR_2^2}$$...
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Physical circuit not drawing as much current as my calculations show

I've created the circuit below and have calculated the following values: R' (equivalent resistance of entire circuit) = 1 / ((1/470) + (1/470) + (1/470)) = 157 ohms I1 = VBattery / R1' = 6V / 157 ...
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How to measure current flowing in each resistor in parallel circuit on Tinkercad?

I have designed a parallel circuit on Tinkercad and I wish to measure the current flowing through each resistor using multimeter. However, the multimeters' arrangement are seemed to be weird because I ...
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(Sort of) diode OR'ing a PoE supply output and a buck regulator output

I have a device that can be powered by two input supplies, 1) PoE or 2) by a DC input that can accept 5-24V. Internally, I need a 3.3V rail. I'm using the LM5070 IC reference design (see datasheet) to ...
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Li-ion BMS 2S3P wiring to a 2S BMS

I'd like to seriously increase the capacity of my pack by adding more cells in parallel whist maintaining 8.4v from these 4.2v/3500mAh 18650 batteries. I'd like this scalable so I could potentially ...
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13 votes
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In FPGAs, is it safe to execute non-blocking assignments like `b <= a; a <= 0;` in the same clock cycle?

I have a piece of code in Verilog which needs to assign the value of shift register to an output register when the shifting has finished, and I want to reset the value of the shift register in the ...
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Batteries in parallel - incorrectly connected

My setup/problem: I have two 12 V, 200 Ah batteries (deep cycle lithium) that I use as auxiliary batteries for my van conversion (total 400 Ah). I connected the batteries in parallel, but made the ...
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12 votes
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White LED doesn't light up when a red LED is parallel to it

When I connect a white LED to 5v (Arduino) with a 220ohms resistor, it lights up perfectly fine. But, when I connect a red LED parallel to it, only the red one lights up. Note that when I connect the ...
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Parallel resistors connected only on one side?

In this diagram, with four different resistors, in the lower circuit, we know that the voltage across all resistors is the same, and the currents are different. With the formula 1/Rn = 1/R1 + 1/R2 + ...
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3 votes
2 answers
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Wiring different amp hour batteries in parallel

Can I wire 2 lithium batteries of the same make but different amp hours in parallel? I need 300 Ah in my battery bank. Can I wire a 12 V 200 Ah lithium battery and a 12 V 100 Ah lithium battery in ...
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Question about voltage in parallel circuits

So here is my schematic diagram at t < infinity for an RL circuit. I am given only a voltage source. My question is that since the voltage is connected to both ends of the circuit in parallel with ...
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Connecting LEDs in parallel using constant current driver

I need to drive 4 high power LEDs. Because of their high power, they cannot be connected series as the voltage required by 4 in series would be too high. Their high current requirement (500mA) also ...
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