Questions tagged [parallel]

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

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28 views

Parallel resistor and current source analysis

I'm a little bit confused by this circuit. I want to analyse the current "I"s AC and DC terms. Since the capacitor will allow AC, there will be an output current Iout which is the sum of Ir ...
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3answers
60 views

Connecting batteries in parallel to the existing batteries that are connected in series

I have 6 12V batteries all the same volt and same amp. I need 48V to use and I connected 4 batteries in series to get the 48V, but two extra batteries are just laying there doing nothing. I thought of ...
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38 views

6V lead battery to 3.6V li ion to add capacity to LED motion light

Is there a way to hook up a 6V lead battery in parallel to a 3.6V li ion battery that powers an LED motion detector light? Also - it is solar powered. So ideally it would charge too. Currently, I ...
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43 views

Efficiently drive multiple LEDs in parallel with individual PWM control

I'm looking for a solution for driving multiple (around 30) LEDs in parallel. Requirements: Drive 30 identical LEDs with 2.1V, 20mA each. High efficiency (mobile application with limited power) ...
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2answers
27 views

Wiring 2P2S battery pack

I have 4 18650 batteries and I want to make a battery pack of it. If all the batteries were new and had similar voltage/capacity I could easily charge them all together in parallel with my charger. ...
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3answers
33 views

sync signal on parallel DC/DC-Converters

I am currently designing a circuit to drive a high power laser-module at 12V/40A. I found the idea from Marco Reps https://github.com/marcoreps/laser_driver very inspiring for my design. Since the ...
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2answers
64 views

Parallel resistor before voltage amplifier

For my project, I would like to amplify the output from a photodetector for subsequent analysis with an oscilloscope. The output of the photodetector is a current. Since we are using a voltage-...
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1answer
27 views

Confused about the functioning of a QRE1113 reflectance sensor

First year IT student here. I've been stuck on a problem involving a QRE1113 sensor, in which we were given the schematics below: From my understanding so far, the reflectance sensor is divided into ...
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89 views

Can I safely balance a series/parallel cell circuit to power a 12V soldering iron?

I want to power a 12V soldering iron with 2x 21700 '40T'batteries and 3x 18650 '25R' batteries with a torroidal rheostat between them. The 3x25R batteries will be in parallel. The rheostat will ...
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1answer
51 views

Help with LEDs in parallel

I am working on a project where I have to use string LEDs running on 5V (USB power.) I had purchased one such string, which is 10m in length and has roughly 50 LEDs inside. My specification requires ...
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1answer
49 views

Circle with arrow symbol interpretation in circuit

I am trying to find all currents in this circuit: (Question 19 from https://www.allaboutcircuits.com/worksheets/algebraic-equation-manipulation-for-electric-circuits/) Although I'm familiar with Ohm'...
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1answer
24 views

Parallel Caps as a Bipolar (twin polar in combination)

So, I saw a similar question about 2 caps in series to make a bipolar. Lets assume polar electrolytics I pretty much "get" electronics and build stuff - it works as I expect mostly. I have ...
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2answers
63 views

Driving 120 V socket from two different switches/circuits

I have a garage 120 V overhead light connected to a light switch at the entrance. When the garage door opener engages, another 120 V light on the opener lights up but that light with one bulb is ...
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37 views

Parallel Power Supplies

I have an application where we are supplied 24VDC but need to drop that down to 5V for some of our control circuitry. For DFM reasons, we are limited to buck converters that can only safely supply 3A; ...
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2answers
66 views

Can you help me understand this equivalent resistance problem?

It is said that \$R_{th} = 12 \parallel (2+8+10)\$. Why isn't it \$ 8 \parallel (12+2+10)\$?
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1answer
48 views

Best practices for parallel DC/DC Boost Converters

I'm working on a portable project that takes 4 (appropriately-rated) Li-Ion cells in a 4S configuration (14.46-16.8V) and boosts it to 27V for a 10-20 Ohm resistive load (soldering iron). The ...
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2answers
30 views

Clarification of “strobe pin” 4-bit latch/4 to 16 line decoder

I'm wondering if I can get a specific behavior out of this chip. I have read the data sheet and am having some trouble understanding the usage of the Strobe pin. CD4515BM96 Datasheet PDF USE CASE I'm ...
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51 views

Small DC motor in parallel - what battery to use for powering the circuit

I am very new to the word of electrical circuits. As I finally decide to learn about electricity and componants, I bought this kit to start in a fun way: The motor according to the seller is a DC 1.5-...
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0answers
37 views

Reverse charge protection for parallel primary lithium cells (CR2450)

First time poster, long time follower here. I am looking into the safety aspect of using primary lithium cells in parallel. The reason behind using parallel cells is to increase overall capacity. In ...
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15 views

Can I mix different capacity (Ah) AGM batteries in an inverter battery backup setup such that they “balance” in state of charge?

I have a large 12V (input) inverter that I use to run a shallow well pump during power outages. I currently have four 75Ah rated 12V AGM batteries connected to it all in parallel that are all in ...
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1answer
43 views

What are the limits to parallel shift registers in electronics (in comparison to optics)?

Brackenbury and Mason in 1988 (https://iopscience.iop.org/article/10.1088/0022-3727/21/10S/044) said, on comparing parallel shift registers in electronic and optical computing, 'When implementing such ...
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2answers
62 views

How do I wire two barrel jacks together in parallel?

I am quite new to electronics, and especially PCB Design. I want to have two barrel jacks for DC input to my circuit, wired in parallel, but want clarification on my circuit design. The idea is that ...
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1answer
91 views

How can an AC source be connected in parallel with a DC one (through a capacitor) in a common-collector BJT configuration?

As far as I understand, voltage sources (regardless they are AC or DC) should never be connected in parallel, since they are not ideal and one would end up charging the other. However, in the ...
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1answer
43 views

How to rewrite this equation?

How can the following equation which represents two series resistors (a & c) in parallel with a third resistor (b) be written in terms of conductance?
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1answer
49 views

Three phase motors in parallel - possible?

Is it allowable to connect some (a group) of three phase fan motors with Dahlander wiring inside in parallel? The whole group will be used for low and high speed according to request. Equal load on ...
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1answer
583 views

Connecting two DC sources in parallel using diodes

In the following circuit two DC sources with different voltage and current are connected in parallel using diodes. Can I assume that the load works fine if either of the source is available (S1 or S2) ...
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2answers
77 views

Current on human with grounded electrical device

Assuming I have a grounded electrical device, for example a microwave. The left drawing shows that the phase wire is connected (due to a fault in the wire) to the microwave case, and an electrical ...
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3answers
93 views

What is equivalent resistance equation in this case?

If we have three resistors (A, B & C) and we know that A is connected in parallel with B and also A is connected in series with C. How can we write the equation of the R equivalent of the three ...
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1answer
98 views

Diodes and resistors theory

I came across a problem which I cannot calculate by theory. How does this circuit with diodes and resistors work? In the above diahram, I can calculate the current simply by subtracting the voltage ...
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0answers
42 views

Using Parallel MOSFETs as a simultaneous switch

I have searched quite a while, but using parallel MOSFETs to alleviate thermal issues and dividing currents seemed to be the critical issues for lots of people. For me, I'm trying to use the parallel ...
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2answers
68 views

When running two devices in parallel is the amperage always split exactly 50/50?

I have a AC to DC adaptor that outputs 12V 3A. This came with a USB HDD dock which has two slots. I want to splice a 12V fan into the wire in parallel so they are both powered by the same wall plug. ...
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1answer
46 views

How to solve voltage dependant voltage sources in parallel to a resistor?

I just started learning about source transformation and came across this question. I get that I can replace the current sources with voltage sources in series along with the resistors in series as ...
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1answer
67 views

Can this capacitor circuit on the left be rewritten as the one on the right

In other words, it should be in parallel.
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1answer
33 views

Cause of delay in CAN

I am dealing with a differential drive robot that interacts with several motors and actuators, all through a powerful NVIDIA Jetson Xavier. The Jetson runs Ubuntu and I use Python3 for programming all ...
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1answer
55 views

Why is the sum of resistances different?

For the following circuit, I found the total resistance with the following equation: However, the solution calculated the resistances in the left and right portion of the circuit in summation with ...
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1answer
35 views

Signal Integrity with Parallel Switch Control

Please excuse what is likely to be a very basic question, but I am an ME, and this stuff is somewhat magic to me. First, I'll provide a minimal, generic question, and then, for those interested, I'll ...
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2answers
56 views

Measuring parallel resistor without current

I am trying to read the temperature sensor in a car with a Raspberry Pi. The temperature sensor's resistance changes as the engine temp increases however the temperature sensor would be in parallel to ...
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1answer
48 views

Understanding LED chain systems

There are several LED light chain systems on the market, like the Konstsmide 31V system or various traders' "System Decor" or "System 24". All seem rather similar, but there are no ...
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2answers
123 views

Time constant of parallel RC circuit

I have read about Series RC Circuit and have understood the Time constant concept. Wikipedia states - "It is the time required to charge the capacitor, through the resistor, from an initial ...
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5answers
261 views

Finding current through LEDs in series-parallel circuit

I'm stuck confirming that the current pulled in a circuit will be 15mA. If I have hypothetical LEDs that pull 15mA each from 1.8V, and they are put in parallel (I know this is not a good idea, but ...
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2answers
716 views

Reversed DIP Switch

Simple question, why does the LED lights up when the switch is off
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1answer
136 views

Simple question about the difference between Thevenin resistance and non-Thevenin resistance

In a lecture for an Electrical Engineering course I was taking, the professor did an example on solving a Thevenin circuit. When he solves the circuit for Thevenin resistance he adds two resistors in ...
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1answer
63 views

Diodes-practical analysis

Need to find VR1 and VR2 in the circuit when: A) D1: forward D2: forward B) D1: reverse D2: forward C) D1: forward D2: reverse D) D1: reverse D2: reverse. Show calculations. E=9v R1=10kohms R2= 4....
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1answer
48 views

Which output terminals to use in parallel connection

I have four batteries connected in parallel, I have seen diagrams showing where the output terminals are both coming off of the last battery and the parallel connection. I've also seen ones where the ...
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2answers
125 views

The effect of connect batteries in parallel/series on C rating

If I have two identical batteries (capacity:300mAh Voltage=7.4v C rating=25C) is I connect those two batteries in parallel or in series does this effect the C rating of the combination of the 2 ...
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1answer
72 views

Parallel MOSFETs in saturation/active region

Am I right that when MOSFETs are connected in parallel for them to share the current equally (See Parallel MOSFETs) they have to be operated in the triode region? I have an electronic load with 3 ...
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1answer
45 views

A parallel RL circuit being energized by a sinusoidal a.c. voltage of \$v=100\sin(1000t+36°)\$. Find total current in RMS value

The question is as follows: \$\bullet\$In my book it is done as: \$\begin{align}\\ i_R &=\frac{V_m}{R}\sin(1000t+36°)\\ &=10\sin(1000t+36°)A\\ &=10\cos(1000t-54°)....(a)\\ \end{align}\\\$ ...
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86 views

Correct Way to connect 5 car batteries in parallel

My RV (which I bought used) came with 3 Deep Cycle Marine batteries in Parallel. A previous owner added wiring inside the coach for 2 more batteries, but they were not there when I purchased the coach....
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2answers
49 views

Can two batteries be connected both in series and parallel using an isolated 1:1 DC/DC converter?

I have two 7.4V batteries. I want to use the series 14.8V voltage to drive a load but I also want to use them paralleled to drive a lower-voltage load. So would it be possible to connect an isolated 1:...
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3answers
94 views

Calculation of parallel resistors

I am following calculating resistors video lesson and stuck on trying to understand how combining of: 1/Rp=(R2/R1R2) + (R1/R1R2) to ...

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