Questions tagged [parallel]

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

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Why does LED dim when adding second LED in parallel with a single resistor

If I have a led hooked up to a 12v DC supply with a single resistor it runs nicely as you would expect. If I add a second LED in parallel the brightness drops, slightly, the brightness on both is (to ...
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79 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 ...
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50 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 ...
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3answers
101 views

Accessing structures concurrently modified by ISR

I have the the following situation: An STM32L476RG (ARM Cortex M4F @ 80MHz, 1MB Flash, 128kB RAM) parses some string data coming in over UART. The project uses mbed-os. The parsing of the data is done ...
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1answer
142 views

How to wire several 78XX series regulators?

I have a 30V power source and I need to get several different voltages from it using linear regulator. 24V for op amps, 12V for relays and 5V for MCU. They all going to be installed on a heatsink. If ...
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1answer
44 views

Switching several relays at the same time parallel with one or several transistors?

I need to switch 2 or maybe 3 or 4 relais at the same time. Is it best to have for each relay a separate transistor? Or is it perfectly fine to use just one transistor and one diode for several ...
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1answer
62 views

Question about 74LS164 8-bit serial in parallel out shift register

With the 74LS164 8 bit parallel out serial shift registers, I'm confused about a few things. In the datasheet (page3) on the logic diagram why do they suggest using an active low inverter before the ...
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1answer
45 views

Can I connect an inverter supply and AC mains supply in parallel? [closed]

Consider a solar panel is used to charge a battery and the battery supply is fed to an inverter. When the mains AC supply goes off then the backup battery supply kicks in. Suppose I want to reduce my ...
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1answer
55 views

Current sharing parallel power supplies

Recently, I purchased two 48v 25A power supplies. I want to put them both in parallel. In reality, each PSU consists of 2 smaller individual units(see picture), so 4 units in total. Pin 8 of that ...
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1answer
227 views

Why 3 diodes in parallel?

A Samsung switching power supply AD-3014STN delivers 14V 2.14A. The rectifier consists of 3 SB3150 (150V 3A) diodes connected in parallel. One of the diodes was short-circuited, see picture, the ...
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1answer
69 views

Is there a way to secure an 18650 battery pack together without soldering, spot-welding, or an end cap kit?

I'm putting together an 18650 battery pack for an e-bike. The BMS is specified for 10s 36v 40a. I want to avoid soldering, spot-welding, or an end cap kit if possible. I thought I would make each ...
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3answers
59 views

How to use CR2032 in parallel

I want to use multiple CR2032 batteries in parallel for higher capacity in a wireless RF remote (1.8-3.8 V working range for the RF MCU). CR3032 is an option but I rejected it due to price and ...
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0answers
58 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 ...
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1answer
56 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 ...
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1answer
68 views

Recommended design PWM-enabled driver for multiple 1W LEDs in series-and-parallel configuration?

A note on my background: I do have a degree in electrical engineering, but honestly I don't consider myself skilled enough to come up with designs from scratch, hence my post. Design Issue I wish to ...
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2answers
131 views

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 ...
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1answer
30 views

Can I use a Y-harness to charge battery while in use?

I’m a beginner in creating circuits, and I need to find a way to charge a battery while the battery is powering a motor on another circuit. I’m planning on using a parallel circuit, with one end of ...
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1answer
31 views

Connecting multiple LED strips in parallel to a 220v/5A power line (via 12V driver)

I would like to power 5 LED strips via a 220v/5A wall outlet (each strip is 5m in length). I will be consulting and employing the electrician for the best way to run the wiring but from the initial ...
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0answers
75 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 ...
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1answer
38 views

Parallel of transformers. Is R/X condition necessary?

Let say I've got two transformer T1 and T2 with both the same voltage ratio. Each transformer has an internal impedance Z1=R1+jX1 and Z2=R2+jX2 respectivley. Also each transformer has a power capacity ...
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3answers
2k views

Practical considerations when using a large number of capacitors in parallel

Capacitors can be wired in parallel for higher total capacitance and lower total ESR. What are some practical constraints/pointers for using many parallel capacitors (for example, 10, 25, 50, or 100)?...
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2answers
72 views

Switching between series and parallel battery connection

Previously I made same scheme (attached) but with two relays and it worked pretty well. Now I want to rebuild it with transistors (MOSFETs). The main purpose as I mentioned in the subject is to ...
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1answer
141 views

How can I possibly get a 9600Hz square wave, for a serial baud rate?

I'm trying to create parallel to RS-232 serial converter using standard logic (serial transmitter only, no serial receive functionality). To get the clock signal my idea was to get a 7.3728MHz ...
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3answers
66 views

Find the voltage across dependant current source

The question attached in the image : I have found the I in the left loop I=1.19A then I found the vo=-11.9 Here two questions in my mind : 1)does that mean that the voltage across the top resistor ...
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1answer
40 views

Identical li-ion packs in parallel

I'm looking for a 1kWh battery at 36V, something around 30Ah should be fine. Browsing popular sites I see that the lower end starts at about $400 which is a bit over what I'd like to pay. I stumbled ...
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2answers
57 views

Finding a current in a given circuit

The problem has given the following circuit: And asked to find the value(s) of Ix if the elements absorb the power(s) given. I tired to set up KCL/KVL but I keep getting stuck. I first drew this: ...
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2answers
85 views

Clarification on adding capacitors in parallel

I have a 5 metre strand of WS2812B LEDs, at 18W per metre. I also have a 120V to 5V-30A power supply I plan to connect them to. The data pin will be connected to (for now), a PWM pin on an Arduino ...
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1answer
44 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 ...
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1answer
51 views

Protected Li-ion batteries charging / discharging in parallel?

since there is no longer good source of high quality pouch flat type Li ion cells, I am considering to use high new smartphone batteries from service packs. I need bigger capacity - about 10 - 20 Ah,...
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2answers
89 views

Can I use a deserializer without a matching serializer?

I am trying to connect an LVDS output to an 18-bit parallel input. Ser/des ICs like this all state on their datasheets (like on page 12 of the linked datasheet) that before they are able to function ...
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3answers
67 views

Parallel caps transfer function

I am calculating transfer function with some parallel caps in the circuit, same ones. I have parallel 4 capacitors with 100 microF each then total capacitance is 400 microF and it is presented as \$ ...
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1answer
122 views

LED light bulb in series or parallel?

I have been exploring how LED light bulbs work and the circuit inside of them. One particular question I have is how the lights are actually arranged? LIFX, for example, has 4 different types of LEDs;...
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4answers
3k views

How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
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1answer
51 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, ...
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8answers
994 views

Why does current not increase when batteries are connected in parallel?

I built a simple circuit consisting of two battery holders each including x2 1.5 V batteries, a slide switch, a LED and a 100 ohm resistor. The current I measured with a multimeter when the two ...
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1answer
147 views

Building a Huge 18650 Battery Powerbank DIY [closed]

I know there are a lot of threads about this topic already, but I still have some questions about it. Anyways, I am thinking about making a 50-80 thousand mAh power bank depending on the batteries and ...
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0answers
65 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 ...
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2answers
51 views

LED to electrets in parallel (using sound card bias)

I've tried to add an indicator LED to a couple of electrets I have in parallel, plugged into a soundcard. At the LED I'm only reading 0.45V (I believe the bias is 5V). and obviously the LED isn't ...
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3answers
87 views

Do I need to limit the current on the inputs of a parallel load shift register?

I have a Parallel Load Shift register (SN74HC165) When connecting the parallel inputs, do I need to add a resistor to limit the current? And if so, can I use one resistor for all 8 Inputs in total? ...
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1answer
73 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 ...
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2answers
100 views

Non-equal batteries discharge in parallel connection

My friend and I have an argument and I want to ask the community to say who is right and who is wrong in their beliefs, and explain it with formulas and laws (if possible). We have two different Li-...
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2answers
396 views

LM317 Voltage Regulator multiple output where one is 12v constant and adjustable

Is it possible to output LM317 in a parallel circuit where there are 2 voltage and has a different output voltage where one is 12V constant and the other is adjustable using potentiometer?
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0answers
45 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 ...
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2answers
93 views

Adapting an I2C FRAM chip to an SRAM-like parallel interface

I have a project that requires a parallel interface non-volatile RAM. I had hoped to use an FRAM, however the only parallel FRAMs seem to much larger in capacity (and more importantly, price) than I ...
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2answers
70 views

Photomos relays connected in Parallel?

I have a question about PhotoMOS relays like TLP3546A. Is it possible to connect two of these relays in parallel to increase Load current (upto 6A)?? I know there might be issues with Turn On and Turn ...
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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 ...
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1answer
54 views

Confused about proving series and parallel resistance equations

I am attempting to read through The Art of Electronics.In the early sections of The Art of Electronics the authors asks to prove the series and parallel equations. I am unsure where to start. I know ...
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3answers
1k views

Paralleling mosfets to reduce Rds On?

This if a fairly simple question. I have some APT43M60L MOSFETs with a fairly high on resistance. They get quite hot and waste a lot of power in my induction heater. They work great but get really hot ...
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1answer
107 views

Connector Identification on Instrument

I have a piece of instrument made around 2000 with a connector to computer that I cannot recognize. Can someone help me out? It is a 20-pin connector, with 10 pins on each row. Pictures are here: ...
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1answer
89 views

Connecting up to 32 Devices I2C

I'm trying to connect 32 I²C "root of trust" NXP A71CH devices. I'm thinking about a good way that does that, I mean what kind of communication should I use? A digital multiplexer that selects a ...