Questions tagged [parallel]

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

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127 views

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 ...
9
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3answers
1k views

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 ...
9
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2answers
1k views

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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1answer
101 views

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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4answers
99 views

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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1answer
46 views

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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1answer
37 views

(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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0answers
60 views

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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3answers
2k views

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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3answers
100 views

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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3answers
4k views

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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1answer
75 views

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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2answers
96 views

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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2answers
62 views

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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3answers
113 views

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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3answers
116 views

Finding the current through an inductor in a second order circuit?

Assume that the circuit has reached a steady state. I'm trying to find the current through the inductor at some time, t, which should be a function of t. I'm having trouble creating a system of ...
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2answers
50 views

Identifying Parallel Resistors from Series

I have this circuit that I am analyzing, but I am a bit confused about how the resistors are connected here. One end of the 200 ohm resistor is connected to the 50 ohm resistor while the other end ...
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0answers
76 views

Can I connect batteries of different capacity in parallel?

I don't think this has been covered in other posts. I have a 3.7V 6000mAh li battery pack and three 3.7V 2000mAh li battery packs. If I wire the three 2000s in parallel to make a 6000mAh cell, then ...
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1answer
117 views

Parallel-series connection of an odd number of solar cells

I plan on having the following array in my system: Vmpp voltage at max. power point for each cell is 1.67 V Impp current at max. power point is 18.4 mA As the number of cells in the right "...
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1answer
66 views

neon-indicator-lamp for a bypass switch

Please excuse my schematic. This is a Dim-bulb Tester I am building. This is supposed to protect the device under test (DUT) that I will plugin into "outlet", by limiting the current, "...
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2answers
38 views

Find the output voltage of a diode circuit with two batteries connected in parallel

When Vi<-2V, the D1 & D2 both will be turned on and both of them will be considered as short circuits. But how do I find the output voltage with two batteries connected in parallel like this? I'...
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3answers
84 views

Combining two identical 3-phase AC sources

I have a micro hydro setup. The generator is a 3-phase AC motor scavenged from a Segway ES2 scooter rated 36 V, 300 W continuous, 700 W peak. It is being rectified to DC. I thought that would be ...
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1answer
72 views

Can I run 2 relays in parallel for dry/wet contacts?

I have 2 separate relays that are getting 24VAC signals to open/close a NO contact. The end device (FAN) has 2 terminals that give out 24VAC (SS CMD, wet contact). When SS CMD contacts are jumped/...
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1answer
57 views

4x 12V LED strips in parallel with dimmers on 8xAA batteries?

I've built a play kitchen for my kids and would like to make the stove and oven light up. It's been a long time since I've done electronic tinkering so wanted to check I've done my homework right. The ...
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2answers
50 views

Can we connect two mobile batteries in series or parallel

I have two mobile batteries, one with 3.7v 1500mah and other is 3.7v 1300mah. I am using a DPDT switch to switch the two batteries in series and parallel. I use in parallel mode (3.7v) to charge the ...
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1answer
78 views

Quick equivalent resistance question [closed]

I have an equivalent resistance question. Is it possible to find the equivalent resistance of this circuit? I would like an explanation on how one could go about breaking this circuit down further to ...
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1answer
79 views

Parallel to serial conversion

I have a problem where I need to both set and monitor approximately 16 digital line states through a cable about 3m long. Ideally I'd like to have parallel signals at both ends, but serialised for ...
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2answers
609 views

Help discovering communication protocol used on faulty LCD matrix display

I own a device that has faulty 256 x 64 dot matrix display (flat cable damage + some bug infestation). After a disassembly I discovered that display is connected via 20-pin connect (soldered pins). I ...
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2answers
275 views

MOSFETs in parallel, combining heat-sharing and ballast resistors? [closed]

In a circuit like this: simulate this circuit – Schematic created using CircuitLab If each 3 MOSFETs be next to each other and on one heatsink, is current sharing balanced? If MOSFETs have TO-...
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2answers
117 views

Why do we treat R1 and R2 as though they're parallel in this circuit?

I'm working on a homework problem and I need to solve for the base current Ib, and I know to do that I need to find the Thevenin equivalent at the transistor base. My professor solves for it as though ...
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2answers
61 views

How does the current get distributed in a Serial-Parallel battery pack?

I was following a tutorial that tries to emulate the voltage drop in a battery pack with cells in parallel and series (in a 6s2p connection). The pack looks like this: Let's say that one applies 20A ...
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2answers
99 views

Simplify a circuit [closed]

I need to calculate the total resistance of these 4 circuit parts from a to b. Every resistor is R = 10 Ω. My question is how do ...
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2answers
99 views

How to design a parallel-able lab power supply?

I want to design a power module that can be configured in series or parallel if the power sources are isolated. The problem is I don't know how to implant master/slave function, at first I was ...
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2answers
80 views

batteries with different voltages in parallel with diode

I have done research on the internet about connecting batteries of different voltages in parallel and it makes sense that it can be dangerous because current from one battery will be flowing into the ...
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2answers
85 views

Calculate Total resistance in the Circuit

So am trying to find the total resistance in the circuit and potential difference, and new to electronics and not sure if am doing this correctly ,any hlp would be great. Voltage source set to U=24v (...
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3answers
128 views

Resistors both in series and in parallel?

Consider this circuit. I'm assuming that the resistors have the same resistance. The same amount of current flows through them so they must be in series. But the voltage across each resistor is also ...
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3answers
70 views

Equalize batteries

I have two (2) 12V, 7Ah SLA batteries. I want to use them in parallel to support my load. I am not sure about their charge state. How do I equalize them to same voltage and current so that my ...
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1answer
38 views

Parallel Operation of Transformers [closed]

Can we connect Dz1 and Dz11 in parallel, in the case of transformer banks?
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0answers
17 views

Using 3 100 watt PV's w/2 different controllers and batteries [closed]

Can I parallel 3 PV's drop a feed to an MPPT controller charging a LifePo4 LI 95ah and then drop the same 17v 15amp signal to a PVM controller charging an AGM deepcycle 105ah lead acid battery?
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3answers
58 views

SPDT Relays in Parallel

Currently I use inexpensive relays and power supplies to switch in 12Vdc(~200mAdc) via a SPDT relay. Somewhere around 60,000 units we have to replace the relay because of bad contacts. I would like to ...
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0answers
38 views

Current control technique for parallel converters

I had one simple doubt in implementing current-sharing techniques for parallel converters. I studied master slave control but do not know whether I can implement that method to the following diagram: ...
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1answer
89 views

Why don't mass-produced LED chips burn out right away?

In a previous post, I was trying to determine if one of the pre-assembled 300mA LED chips shown below could be rigged up with parallel and series resistors to be correctly powered by a 350mA CC power ...
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0answers
47 views

Parallel light failed to work, one light get's blow other remains good. How to get it working?

I'm using a mobile battery (4V) to power the two (each takes 3.0V) light in parallel since series circuit won't work with one battery. After connecting the wire, for a short time it did work. Then one ...
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2answers
77 views

input parallel capacitors for rectifier in flyback

When should we use multiple parallel capacitors instead of a single one in input rectifier topologies of switching converters such as flyback?? What are the advantages and disadvantages?? thankfully
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1answer
72 views

Calculating total resistance

How do we calculate the total resistance from A to B R1||(R2+R3) but the same can be said for R2 so how does it work? simulate this circuit – Schematic created using CircuitLab
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0answers
30 views

Flash devices that allow write (or read) and erase in parallel?

Is there a flash device that allows you to read/write and erase in parallel (as long as they are in different sectors/blocks naturally - so we can ignore chip erase)? Just to be clear, I don't expect ...
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1answer
53 views

General query on batteries in parallel

I’m new to batteries charging and discharging and I have some general questions: If for example you have AA batteries being charged in parallel do they behave similar to how a load resistor would do (...
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1answer
63 views

Gauging Wire for 12V Parallel Circuit

I'm building a 12V parallel circuit to run some LEDs...I simplified it in the picture below but need some advice on wire sizing in a parallel circuit. The combined amps of the 3 lights is ~11.25amps. ...
2
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1answer
61 views

Crystal frequencies

the context is that I am working on project which uses a 32 768 Hz quartz oscillator used for a uC. My questions are: I have read that series resistance should be low (25 to 100 Ohm) otherwise it can ...
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2answers
114 views

Wiring LEDs in parallel [duplicate]

I'm making progress on building a portable light for my kayak. It will use 3 of following chips: 50W, 12V chips. The battery will have to be portable so I'm planning to wire them in parallel. I ...

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