# Questions tagged [parallel]

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

62 questions with no upvoted or accepted answers
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### Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
0answers
47 views

### Startup and auxiliary/station transformer power parallel to bus

This question is in regard to switchyard/electrical distribution operations in a utility power plant. During a startup, the electric distribution system is lined up so that the startup transformers ...
0answers
1k views

### Finding voltage across capacitor in series and parallel

Here's my circuit: simulate this circuit – Schematic created using CircuitLab I want to find the voltage over the 20uF capacitor; however, what I come up with is 50V which does not seem ...
1answer
175 views

### What's the equivalent resistance of this circuit?

I am a student in 10th grade and our teacher gave us this schematic to work with (Remade with circuit lab): simulate this circuit – Schematic created using CircuitLab He asked us to find the ...
1answer
729 views

### Power Supply Stacking in Parallel

I have two DLM 60-10 Sorenson bench power suppllies (10A limit) that I am wanting to stack in parallel so that I can provide between 1 and 20 A, at a consistent 12 V. I'm not particularly an ...
0answers
76 views

### Can a circuit have capacitors in both series and parallel?

From my understanding, two capacitors (or any electrical elements) are in series if the same current goes through them. Two capacitors are in parallel if they are connected to the same wires on both ...
1answer
86 views

### Combining non-isolated switch mode power supplies in parallel into a single supply

I'm trying to combine several SMPSs each having a ~350VDC output @100mA each. Background: Purchased an unused batch of small DC->DC SMPSs in good industrial quality. Unfortunately they're too weak ...
1answer
372 views

### What to consider when powering multiple devices in parallel?

Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
0answers
48 views

### Sharing power between components in a Arduino circut

I am trying to power both an ultrasound sensor (HC-05) and an infrared sensor (FC-51) from Arduino's 5V pin, connected in parallel. The circuit is very primitive. When connected separately, both ...
2answers
2k views

### Do I need to fuse batteries in parallel?

I have two deep cycle batteries in my Airstream, in the panel there is a fused bus bar (that appears to be faulty) so the solar panels only charge the one battery. Can I just run a heavy gauge wire ...
1answer
193 views

### Nest Protect gen 2 battery to POE

Hey all i am looking for some advice in how to go about my project with a Nest Protect gen 2. In my home i have ran cat6 wire to all 3 locations that require a smoke detector. These cat6 cables are ...
0answers
425 views

### Connecting new and old 18650 in parallel

Now before everyone start saying how bad or dangerous it is to connect used and new 18650 Li-Ion Cells together - I would like to keep it technical and fact based. I (like many others) have many used ...
1answer
43 views

### Paralleling two VR - when neither is overloaded

I have two very simple assembled voltage regulators using AMS 1117-5. They are a 5 VDC output @ 1 Amp (I have seen some paperwork state 5 VDC @ 0.8 Amp). The current draw of the Raspberry Pi with ...
0answers
181 views

### Flyback diodes for motors wired in parallel

When driving two DC motors wired in parallel, do they each require their own flyback diode or can they share a single diode?
0answers
187 views

### Raspberry Pi parallel power

I have wired up 4 Raspberry Pis in parallel, each being activated by its own SPST toggle. The circuit is being powered by a 5V 5A switching power supply. Each time I power on a pi after the initial, ...
1answer
38 views

### What happens: n Hall effect sensors wired in parallel, < n of them is triggered?

This is almost certainly a noob-level question. I only have one Hall effect sensor to play around with so I can't test this out for myself. Say I have multiple Hall effect sensors wired like this, ...
0answers
80 views

### Is this circuit wired in parallel?

Sorry for the amateurish question. I am planning to tap into my car battery's reverse fuse to signal when it's time to receive a wireless signal from a rear-view camera. The camera-feed receiver in my ...
0answers
53 views

### Latching relays connected in parallel not working as expected

I have a project I'm working on where I need 4 relays to open when power is applied to the board and close when power is lost. I need to use latching relays to conserve power as the device could be ...
0answers
61 views

### Parallel Electrets - working BUT

I know this question is similar to the previous one, but it has a slight tweak. I have 4 electret capsules in parallel supplied by 5V (USB supply). They work fine (so I guess the current hasn't ...
1answer
70 views

### 4-bit memory serial to parallel memory register circuit question

I am building a 4-bit serial to parallel memory register and I feel like so far I have gotten things right, but I'm unsure of where to connect the CLR connections. Could someone have a look at my ...
1answer
52 views

### Building DIY TrackIR, need wiring help

I'm attempting to build a homemade head tacking unit for use in computer games using infrared LEDs for my kid. I followed one tutorial where they were wired in parallel. After doing more research, I ...
1answer
73 views

### How to use QSUB to submit jobs in parallel?

I would like to run thousands of simulations using qsub command, but I am not sure how to use it adding variables. Right now I have made this bash script to run my simulations, but it is too slow, ...
0answers
67 views

### Driving Parallel Mosfets

I have a total of 20 IRF3205 mosfets in a H bridge configuration for switching a transfromer to get pure sine wave output. (Five mosfets at each end of thr H bridge). Datasheet says total gate charge ...
1answer
78 views

### Safe to use a common return for multiple DC power supplies?

I have four 12V DC power supplies powering four separate loads (12V LED light strips). Is it safe to use a common return path for all four loads? simulate this circuit – Schematic created using ...
0answers
56 views

### Simulating a specific LED on Eagle through NgSpice

I was trying to simulate a current mirror circuit for a parallel set of LEDs in a project that I am undertaking. However, before actually working with real parts, I wanted to simulate the circuit in ...
1answer
113 views

### Parallel connected LED and current problem

First of all, I don't have much electronic knowledge. I am having trouble connecting the LEDs in parallel.I have two types of LEDs which have different power.Here are some current measurements: The ...
0answers
26 views

### LiPo ballancing circuit

I'm designing a circuit board to which I'll be able to connect multiple LiPo batteries (2-6S) and charge them in parallel without bothering user about balancing those packs firstly. So the charging ...
1answer
378 views

### Finding resistance of unknown resistors in 2 pairs of parallel circuits

If you are given two pairs of parallel circuits, with three unknown resistors and one 4ohm resistor, with the total resistance totaling 3/4 ohms ; how are you supposed to find the resistance the ...
0answers
58 views

### Peltier behaves strangely

I've been trying to test my Peltier moodule (tec1-12706) with 2 1.3V batteries (2.6 in total in series) connected parallel to the module.. ...
1answer
65 views

### Paralleling Multibit current DAC: Improving Accuracy by Averaging

No doubt that if I put in parallel n DACs, multibit (i.e. 16 bit) current output R2R ladder chips, I get n-times higher current at the summing node and the output impedance is also reduced by "n". ...
0answers
19 views

### SLVS/Parallel bridge & sync to CSI-2

I am going to make two prototype boards with the same functionality but using different components. This board will most likely use the OnSemi AR0237 or the OnSemi AR0330. I want to bridge and sync ...
0answers
54 views

### connecting three batteries together

I have a scenario of connecting three batteries together. Two are 12V 80 AH and one is 12V 150AH . All are C20. I wish to make it a 24V system of 150AH by connecting the two 80AHs in parallel which ...
2answers
116 views

### Thevenins Theorem

Can someone please help, I'm struggling with this circuit. I don't quite understand what I need to do, mainly with whats series and parallel. My tutor is not helpfull in the slightest! He' only given ...
0answers
15 views

### Series + Parallel Custom Lipo Cell Charging Options

I have a custom LiPo cell, made up of 8x 11.1V 2200 mAh 30C bats. They are wired in pairs in series, and then all four ensuing sets are connected in parallel, to form a 22.2V 8800 mAh battery. I am ...
1answer
74 views

### There is no math for adding the functions of two parallel filters. Or is it?

I want to add two "parallel" functions. Each of them describes the frequency response of that individual filter. Put in other words, I want to see what the frequency response looks like when the two ...
0answers
54 views

### How to find the effective resistance across the points A and B here?

I had to draw the circuit and take a picture of it as I am not very educated with circuit drawing software. The circuit consists of 5 resistors with their respective resistances written beside them. ...
2answers
434 views

### How does distance between parallel batteries affect voltage drop/required wire thickness?

I'm looking to wire up an off-grid system. What I'm stuck on is battery placement. The likelihood is my batteries will need to be quite far apart (almost 2 metres). My question is how does this ...
3answers
69 views

### Total curent through two parallel resistors

voltage source- 5V This simulator shows that the curent in the left wire will be 10A, like sum of curents through two parallel resistors. Is it wrong?
0answers
521 views

### transfer function of RC in parallel

I was looking at RC in parallel (at the bottom of the page at the link) to understand the transfer function $\frac{V_{out}}{I_{in}} = \frac{R}{1+SRC}$, in the case that the input is a constant ...
0answers
183 views

### Are pull-up resistors mandatory for inputs on modern parallel ports?

Here I go again testing more circuits on two computers with each reporting completely different data yet I feed the same data in. Now this time, the data coming back is all logic highs on my laptop ...
2answers
67 views

### saftey wiring lipo's in series and parallel

I want to make sure I am being as safe as possible. I have 2 18650's wired in parallel and 3 of those pairs wired in series with a 3 cell BMS board. I also have a constant current driver at 700 mA ...
1answer
78 views

### Obtaining data from parallel port without the “phantom power” problem

After making failed circuits in the past, I learned that the cause is that the parallel port was producing "phantom power" (aka powering the circuit). This is because I plugged my circuit into the ...
1answer
70 views

### Total capacitance of two sets of parallel capacitors and resistors in series.

Assuming C1 and C2 both are rated at 2.5V. Is the total capacitance of C1 and C2 0.5uF or 1uF? simulate this circuit – Schematic created using CircuitLab
1answer
45 views

### Is parallel adder doing additions in each bit position simultaneously?

Does parallel binary adder actually make additions in each position simultaneously? I have read various sources and they all have this description relating to the parallel binary adder: "The additions ...
1answer
225 views

### Batteries in parallel and series. Auto disconnect load while charging

New to designing circuits and PCBs. I'm working on a project and I can't seem to figure out how exactly how to do what I'm trying to do. I'm hoping one of you can give me a hand understanding the ...
1answer
101 views

### LED circuit parallel

I have SMD LEDs of 5 watts each having 6500kelvin with 9-12volts forward voltage with 900-1050 mA operating current and 1100lm@500. I have put 3 LEDs in parallel and connected it parallel to my ACxDC ...
0answers
305 views

### Connecting multiple series battery holder in parallel of 18650 batteries

I'm pretty new to this, i understand how series and parallel work. Just want to ask if it's safe to connect multiple series battery holder in order for them to be parallel? If my battery are all the ...
0answers
195 views

### Lithium polymer/ion battery in parallel

Is it possible to put Lipo/Li-ion batteries of different capacities in parallel? I am aware that putting anything different in series/parallel isn't the best option, but design limitations do not ...
0answers
145 views

### Correct Series/Parallel 12v SLA Wiring?

Is this an optimum wiring scheme for draining and charging seven 12v SLA batteries of different amp hour ratings wired in series/parallel for 72v 28ah output? (powering a scooters speed controlled 1....
1answer
117 views

### Parallel connect 2 batteries while the panels are separate?

I have 2 solar panels, 100w and 125w. They will separately power one 100ah battery each. Can I parallel connect the 2 batteries for charging purposes or should the batteries separately go to the same ...