Questions tagged [series]

In the case of an electronic circuit, series refers to components connected in such a way that current must pass through each in a single path.

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Is it safe to put Lithium Ion battery packs in series?

I have 2 3.7 volt lithium ion battery packs I took from a cheap toy drone. I would like to put the batteries in series to provide greater voltage for my project. I do not know a lot about lithium ion ...
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Batteries in series capacity considerations

Let´s say I have a 2 AA 1,5V 1000mAh Alkaline battery cells in series. The circuit it´s connected to consumes 500mA, works at 3V and it´s powered on always, and taking into account other electrical ...
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Variable voltage sources in series

I'm trying to figure out how to design a fan controller for a specific application. I have two 12V sources. One of them has a potentiometer to reduce the output to 6V (min). The other is normally ...
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Two power supplies with different current in series

Does the schematic in the picture work with these powersupplies from China? Both are rated with 5V but one with 20 amperes and the other with 2 amperes. https://www.aliexpress.com/item/33042313383....
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How do I achieve speed reduction in a DC series motor by adding resistance? (calculation)

So i'm hoping someone can look over my answer as i'm sceptical it's right. I used a shunt calculation for this series question as I've honestly no clue how else to do it; Calculate the size of an ...
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Is it possible to drive a power piezoelectric in lower frequency than its own frequency?

I am driving a piezo transducer simply by an inductor series with piezo. the resonant frequency of the piezo is about 40KHz and I designed a 20KHz transducer. I'm giving a pulse voltage (using a class ...
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55 views

Is there an optimal configuration or any way in which I can effectively connect

I currently have a 72V e-bike. The configuration of the batteries directly from manufacturer is 6 12v 20AH valve regulated lead acid batteries connected in series. In taking the limiter harness out ...
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Connecting two DC converter's inputs in series

I know it won't work, but I want to make sure I have the right explanation why it won't work. Given are two devices which have a build in converter (I have this digital voltmeter in mind). They need ...
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What is the correct way to solve this problem?

I first solved it by converting the two star connected networks into delta networks and further solving them. Then I solved by considering one star, converted that to delta and then used parallel ...
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What is the best battery topology for my inverter-charger application?

Background: I have a Magnum Energy MSH3012RV 3kw inverter-charger that runs on 12VDC and I'd like to be able to discharge around 250 to 300 AH between recharges (from 120VAC input) without the ...
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simple question on circuits

This is a simple question on impedance and i just need to make sure i know the correct answer
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Does decrease in voltage decreases the speed of electrons in a series circuit?

Let's say we have a 5V battery and a ohmic conductor that consumes energy connected in a series circuit with constant resistance. When we increase the voltage, the number of electrons flow through a ...
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CMOS inverter in series

I have the circuit below. Now my question is: why the rise time and fall time measured on Vout are the same as in a circuit using only one inverter gate? I know the propagation delay is the sum of ...
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2answers
57 views

Component connected in series in a block diagram of a control system

I am given the following block diagram of a control system (I think it also applies to electrical circuits as well with linear components. Correct me if I'm wrong). My textbook says that C(s) is ...
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Do I choose a series or parallel battery set up to power a fish finder?

I plan on running a Garmin UHD 73SV fish finder off two 12V 7A lead acid batteries for a kayak. The unit pulls 1.25Ah. So if I run them in parallel I will have 12v 14A with a run time of about 11.2 ...
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Is this network of resistors in series and parallel, the way I intended?

https://www.circuitlab.com/circuit/gu5zh6pdvj8q/parallel-and-series-question-circuit/ simulate this circuit – Schematic created using CircuitLab Do these circuit schematics accurately ...
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What happens when you put two rectifiers in series to get DC from a stepper motor?

For a project a stepper motor is used as a generator because of the decent amount of power at low RPM. Now have found that one rectifier is sufficient when placing the coils in series. First however, ...
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64 views

Center-tap transformer current calculation

I have a transformer with two secondaries, one is 24 V / 500 mA and the other is 12 V / 200 mA. I want to wire them in series to make a center-tap transformer: simulate this circuit – Schematic ...
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isolated DC-DC converter in series

I am still unsure about connecting two DC-DC converters to achieve a higher output voltage. Regarding my question about this DCDC converter. The answer I selected does not work when no load is ...
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1answer
274 views

Connect two mobile power banks in series

I have two 20.000 mAh mobile power banks with two USB ports that can deliver 5V at 2.4A. I need a minimum of 9V at 2A in output. I have 2 male USB connector cables and I want to connect the negative ...
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Torchlight LEDs in series, is this possible?

I recently got hold of 2 broken LED torchlights and I had the idea of putting the LED heads together (after I cut them off) in series to make 2 lights for a camping powerbox that I want to make (LEDs ...
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Simple Filter and RLC Circuit Pointer

If someone could push me in a decent / reasonable direction it would be much appreciated! I do a HNC part time on electrical / electronic engineering and with how busy I have been at work I feel I ...
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1answer
44 views

Expert advice needed on electric bike battery setup

I'm currently building an electric bike for a competition. I know I want a 15s lithium ion NCM battery (max 4.2 volts/cell), but don't have a battery management system or a balance charger than can ...
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Questions about tapping a normally 60V solar panel at 3 different places

I have a PV solar panel that is 96 cell, about 60 volts open circuited, and it seems to be divided in 3 subregions which are vertical. The cells are arranged in 8 columns, 12 cells high. The panel ...
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Series circuits and serial circuits

I have seen quite a few times now where someone creates a simple circuit and when describing the configuration of the components they say that it is either in parallel or serial. I have only ever ...
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Comparing transformer set ups

Is it practical to connect the output of a ferrite-core 1:40 transformer in series with the input of a 1:6 ferrite-core transformer as a means of acquiring 240 V?What would the pitfalls be of this ...
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Different 'connection types' between components

Is there a name for the different types of connections between components? For example in the following: Point A is connected between two components -- a battery and resistor -- and so is in series. ...
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Why do series resistors have a single current running through them?

In a circuit such as the following: The current is the same through all the resistors and is: ...
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57 views

Can a USB power source run 4 IR LEDs in series without a resistor?

USB is 5V, and the voltage drop across the 5mm IR LEDs I'm gonna use is around 1.2V, if I connect 4 IR LEDs in series and perhaps more in parallel, do I still need a series resistor? Will cooling ...
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616 views

DCDC converter in series

I need to convert 5V (main power supply) to +/- 30V. I have two +/-15V DCDC converters and was wondering if I can connect them in series to generate the +30V and -30V rail? My simple schematic I ...
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130 views

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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124 views

LEDs in series without resistor

Say I have an ideal situation (good quality functioning power source and components) - 12V source and 3V (each) LEDs. Can I wire these 5 LEDs in series to the 12V source without a series resistor and ...
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167 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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Preservation of power when wiring batteries in series - battery life is reduced if load is kept the same

This is really just a "sanity check" type question. Am I correct that if you place two batteries in series, that the battery life is effectively halved relative to just one battery, assuming the load ...
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Question about purely resistive incandescent lamps put in series and fed double normal voltage

I am curious about how and why if you take 2 purely resistive incandescent lamps (light bulbs) that are rated at 40 watts and 60 watts, both 120V AC (RMS) ratings, if you put them in series and feed ...
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Series current calculations

simulate this circuit – Schematic created using CircuitLab My question is about elementary series current calculations. Above you see 3 circuits. All circuits have a Vin of 24v connected to ...
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4answers
103 views

What material can be used to connect nichrome heaters in series

I would like to run 3 heaters (26 awg straight nichrome wire with slightly different lengths) in series to form one continuous heater with 3 different temperature zones. All of the sections are ...
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1answer
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Connecting a lower voltage load to a series of higher voltage batteries in halfway?

I have a battery supply source which is a series of lead acid batteries up to 72V. I have a 48V motor system (few kilowatts) and peripherals to be installed on to this power source. Due to limitation ...
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72 views

Series identical power supplies

Recently I made a thread about parallel supplies, however my helper fried one of them... Wonderful. So I got myself 4 of the famous DPS-1200FB-1 12v 100A power supplies. So I am an electronics noob, ...
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2 NMOS in series, connected source to source

I am working with DC2418A evaluation board (Link to datasheet is HERE) Schematic is on page 5 I am using version A, so we ignore Q1 My question is about Q2 and Q3: Why are they connected source to ...
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100 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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Question related to TVS Diode in series

I have a questions on my mind, and I hope that can be answered. The line to ground voltage is 54Volt, and I would like to know if it is possible to have two bi-direction TVS diode in series. I will ...
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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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Is charge batteries in series faster than in parallel?

I would like to know if charging 7 lithium-ion batteries in series with BMS 7S are faster than simply charge them in parallel. Please for your advice, thank you!
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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 ...
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36 views

In an open circuit, are capacitors still in “series”

In the picture below, there are two capacitors right next to each other in an open circuit (ie the wire with V2 written above it does not go to ground). Assume that each capacitor had been previously '...
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198 views

8 ohms and 4 ohms speakers wired in series - volume issues

I have two identical sets of ceiling speakers connected to a cheap 2 channel Chinese micro amp - one 8 ohms and one 4 ohms, wired in series per channel. The 8 ohm speaker is too loud when the volume ...
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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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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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53 views

Pulse Down a line with Series terminations between transmission lines

I am interested in a relative edge case in transmission line of a simulation. If send a pulse down the setup below, now obviously my rudimentary steady state electronics knows this is a basic voltage ...

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