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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70 views

Design question, balanced charger design for battery drill, plausible?

See also updates below! A battery driven drill, battery pack is faulty and obsolete and want to try to make a new package of batteries. Plenty of TP4056 modules and 18650 batteries lying around to ...
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47 views

Two phone batteries connected in series not working

I have two, fully charged, 3.7V standard Nokia phone batteries, that I want to connect together to use as a 7.4V battery, I connected the (+) of one to the (-) of the other, and then tested it but it ...
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How are this voltage source and resistor (separated from each other by a capacitor) re-imagined as a resistive voltage source?

I'm trying to implement a wave digital filter from this research paper: Emulation of Operational Amplifiers and Diodes in Audio Distortion Circuits R. C. D. de Paiva, S. D Angelo, J. Pakarinen, and V. ...
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Calculating resistance in theory

I'm studying about calculating the Equivelant Resistance in some circuits and I haven't figure out how to calculate this one I thought the way to go was to do ...
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35 views

How does series parallel combination of LEDs affect the temperature rise?

I was designing the LED light of 200 W with LED combination of 9 series / 8 parallel, each LED is 6V thus total output voltage is 56V. I am using Meanwell xlg 200 W driver. But this resulted in high ...
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About the 32-bit divider

I am currently working on a hardware design, its function is to realize the Taylor series of cosh. In it, I need to use a multiplier and a divider. They are both 32-bit input and 64-bit output. I ...
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32 views

Trouble understanding the LM555 schematic for 50% duty cycle oscillator mode

I am working with a LM555CN and I am trying to have it run in astable mode and make a LED blink. In essence I am trying to follow along with this video. Now, there is a part in the chip instructions ...
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58 views

In practice, does the order of a series RLC-shunt circuit matter?

In simulation I'm finding that the image pictured below works well to optimize a complex impedance match. I know that Z = ZL + ZC + R, so in theory the order shouldn't matter---but in practice, with ...
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51 views

Connecting two PSUs in series and parallel

So I have 2 identical 1W DC-DC converters (9V -> +/-5V). The converters are isolated to 6kV. The exact part is: XP IHA0109D05. If I connect both (using the same battery for each one) in parallel ...
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69 views

I have 2 12v batteries wired in series to get 24v. Can I add the third battery to one of the other two in parallell?

Is this something that is possible? Is it a good idea? I would then have double the amp hours on one "set" of the batteries in series. All batteries are the same brand and type.
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What is the best way to connect different LEDs?

I'm working on my first PCB for horticulture lighting and wondering what is the best way to connect all LEDs. The idea is to use both white LEDs (using Samsung's LM301H LEDs that require 2.75V@65mA ...
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1answer
58 views

Why would a multimeter (ammeter) connected in series prevent the instrumented device from powering on?

I'm trying to measure the current used by a 3.5" hard drive in an external enclosure. I connected my multimeter in series with the positive 12V power supply, but in doing so, the hard drive ...
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5 LEDs work in parallel but not in series. Why exactly?

I've been learning electronics very thoroughly for the past couple of weeks. I'm running experiments on LED circuits at the moment and there is one thing that is completely beyond my comprehension. I'...
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36 views

Calculating maximum series/parallel configurations for unique resistors

Say I have 4 unique resistors. How would I calculate all the possible unique series and parallel configurations and thus, calculate all the possible total resistances? And how can I expand this to ...
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1answer
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Dev Noob - Can I use two output pins from an ESP32 to get a voltage of 7.2?

I have an ESP32 and I would like to get an output voltage of more than 3.6 from its pins. Would activating them at the same time and connecting them putting them in series make the voltage rise to 7.2 ...
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Solar charging “12” volt nimh battery pack

So, I have 3 parallel 8-battery packs of nimh batteries wired in series - a total of 24 AA batteries. One battery is 1300 mah so I assume this should give me a total of 3900 mah. This gives me 9.6 ...
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62 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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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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96 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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Achieve 6.6V DC using 2 or more ESP32 output pins in series?

I need to use the ESP32 to trigger a SPDT relay. The output of a single pin is insufficient to surpass the relay's threshold. Can I combine multiple pins to achieve greater voltage? This ...
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1answer
64 views

Christmas LED lights connections

I have several Christmas lights with different AC adapters. First case In the label of one of them, I read: Primary: 220-240 V ~ 50/60 Hz Secondary: 31 V DC 3.6 W ...
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1answer
30 views

15v from 20pin and/or 24pin ATX Power Supply. Connecting PSU circuits in series

I have a portable 12v car battery charger, jumper, maintainer, and inverter with integrated USB ports, 12v car adapter slot, jumper clamps, emergency LED light, and a 3 prong 110v/60hz wall outlet. It ...
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37 views

MOSFET N-channel as switches in an AND gate

I thought I could use two BS170 transistors working as switches in series, to create logical AND functionality. My circuit is switching an LED with 1.5V of forward voltage and 10mA current set by a ...
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1answer
63 views

Connecting capacitors in series after charging them

Assume I have two identical capacitors and charged both equally. If I measure C1 with a voltmeter, I read 5V, and C2 reads 5V. If I connect the positive leg of C1 to the negative leg of C2 (connect in ...
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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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Powering LEDs in a container farm

Container farms take a lot of light. Powering it is not cheap. And I have spent a lot of time pondering the different possibilities. I've developed a PCB to control 4 x 300watt PWM amplifiers. This ...
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3answers
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What happens when 4 batteries are in series, but with wrong polarity?

I remember that, as a child, we had an electronic game that didn't have a proper ON/OFF button. So someone older in my family used this trick "to power it off": they flipped one of 1.5V AA ...
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45 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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65 views

Globe brightness in series circuit

So in a simple DC series circuit, why do some globes shine more brightly than others? And which ones are the brightest? Obviously each consumes a certain amount of voltage but I don't think the ...
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94 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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2answers
122 views

I’m an electrical idiot - can you help me?

I have overhead doors at the back of my office building. I wanted to wire up a large red LED next to the light switch so that when employees leave, the light would be red indicating the doors are up. ...
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53 views

DC/DC MC34063 serial boost converter for increasing voltage

I am trying to build one ultrasonic mist IOT device for this github project. SO in the power supply part it needs to have almost 70V input voltage, so for more Voltage you can use boost converter ...
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3answers
46 views

Calculate the frequency corresponding to a given current or power attenuation in an LRC circuit

For a series LRC circuit, I'm trying to calculate the frequency corresponding to a given current (or power) attenuation to either side of the resonance frequency peak according to the formula for ...
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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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5answers
415 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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Basic Series/Parallel connection understanding

I am just starting out with electronics and I have understood that there is something fundemental I just cant seem to figure out about parallel and series connections. I am having a lot of trouble ...
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731 views

Reversed DIP Switch

Simple question, why does the LED lights up when the switch is off
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1answer
142 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
65 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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Is it possible for series connected battery cells to provide different currents?

I know current through series elements is always the same. I was wondering if the same is true for series supplies (batteries) or if it is possible for one supply to provide more or less current than ...
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207 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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3answers
109 views

6 x TEC1-12706 in series cannot reach desired amperage, why?

]I have 6 EC1-12706 in series connected to a variable DC Power Supply (rated with maximum 30V and 10A). I set the power supply to 30V and 1.50A. My problem is that the DC Power Supply when the output ...
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3answers
116 views

Buildint series voltage regulator using transistor and zener diode

I am a new to the electrical engineering and currently trying to calculate the series voltage regulator for raspberry pi at maximum current draw. Raspberry Pi works at 5 volts and 2.5 amperes at ...
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1answer
48 views

Can I power and use 1 small voltmeter for 3 12v batteries in series?

I asked this question for 4 voltmeters before, and received some great feedback. Unfortunately, it generated too much heat. This is the design I'm thinking of implementing now, but I want to make sure ...
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455 views

Can I power and use 4 small voltmeters for 3 12v batteries in series?

I bought some small voltmeters hoping I could use them with my kid's Razor dirt bike. The bike uses 3 12v lead-acid batteries in series to provide 36 volts to the motor. Ideally, I'd like to use the ...
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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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54 views

Can a DC CC power supply be used for current limiting in a circuit with a battery in series

In circuit #1 I showed typical adjustable power supply usage it can limit voltage and current, all good. It got me thinking. Let's say due to some reasons I can't replace battery with a power supply ...
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58 views

Cascading Isolated Power Supply

I want to implement a few chips for battery management and due to the ADCs of each cell working at bigger voltages each, and each chip(I have to cascade thre ICs LTC6803-4) with a maximum voltage ...
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392 views

A large resistor in series (parallel) with a small resistor has the resistance of the larger (smaller) one, roughly?

I am currently studying the textbook The Art of Electronics, third edition, by Horowitz and Hill. Chapter 1.2 Voltage, current, and resistance says the following: A large resistor in series (parallel)...
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Calculate voltage and amp drop of resistance

How do i calculate the voltage and amperage drop from resistance on a DC series circuit? I know ohm's law and all, but I’m doubting how much of actually applies to this equation, since i know the ...

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