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.

Filter by
Sorted by
Tagged with
0
votes
1answer
49 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 ...
0
votes
2answers
65 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.
0
votes
1answer
48 views

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 ...
1
vote
1answer
55 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 ...
2
votes
1answer
298 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 ...
-2
votes
2answers
82 views

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'...
0
votes
1answer
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 ...
1
vote
1answer
63 views

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 ...
0
votes
0answers
30 views

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 ...
1
vote
2answers
186 views

How to calculate voltage drops and power for a current dependent current source in series?

So the question goes as follows: For the circuit in the figure below determine: a) the loop current, b) voltage drops across all the resistors; c) voltage of the dependent current source, d) power ...
0
votes
3answers
93 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 ...
0
votes
3answers
61 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 ...
0
votes
2answers
31 views

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. ...
1
vote
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 ...
1
vote
4answers
6k views

Connecting batteries in parallel doesn't produce greater amperage

Having two 3.7V "3000mAh" Rechargeable Li-ion batteries, I tested connecting them in series and parallel. Using a multimeter, I measured the amperage of ...
-2
votes
2answers
66 views

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 ...
3
votes
2answers
1k 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 ...
0
votes
1answer
27 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 ...
0
votes
0answers
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 ...
0
votes
3answers
150 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 ...
0
votes
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 ...
-1
votes
2answers
66 views

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)\$?
0
votes
2answers
126 views

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 ...
0
votes
4answers
175 views

One resistor in series and two in parallel for LEDs

So I've read that using one resistor to limit current to two or more LED's in parallel is bad practice, so I wondered what about this kind of circuit: Is this also bad practice? Each LED has it's ...
-1
votes
3answers
70 views

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 ...
0
votes
1answer
781 views

Using relay contacts in series to switch DC loads

We are using relay DRM570110LT and We need to switch 3A @220VDC in the output when we have a DC load. As the datasheet for this relay says, the rated switching current is 5 A, but I've been told this ...
3
votes
4answers
11k views

How many AA batteries can I wire in series?

I'm tinkering with some DC motors, and have been able to drive them with a 1.2A wall wart that produces a variable 3-12v. I want to drive the motors with 24v+. Would I be able to get what I need by ...
0
votes
1answer
2k 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 ...
0
votes
1answer
134 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 ...
0
votes
1answer
333 views

Neglecting certain elements in deriving the current of a series RLC circuit

The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw: I ...
0
votes
1answer
139 views

coils/Inductors in series for power transfer

I have an air core inductor that I want to use for resonant coupling purposes. This inductor has an inductance value of 500nH. Is it ok to connect another inductor with a value of 100uH in series with ...
0
votes
1answer
1k views

Auto Fuse Tap Parallel or Series

Am looking to use a fuse tap to run a dash cam. These are instructions https://www.lumision.com/wp-content/uploads/2015/09/Micro2-Fuse-Tap-Instructions-e1441486778366.jpg for a fuse tap and consistent ...
0
votes
1answer
44 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?
0
votes
1answer
297 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 ...
1
vote
2answers
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 ...
2
votes
3answers
2k views

Do I Need a Series Resistor in Front of a Blinking LED?

I bought LEDs with a built-in chip which make them blink. The type of the LEDs are Kingbright L-56BSRD-B. The complete spec sheet is here. After reading the spec sheet I do not know if this LED needs ...
1
vote
1answer
443 views

Leds in series with buzzer without resistor

So I'm pretty new at this, so I'm sorry for any dumb questions/statements. I'm trying to build a puzzle box where you activate a circuit with a reed switch using a hidden magnet. Activating this ...
1
vote
3answers
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 ...
0
votes
2answers
171 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 ...
-1
votes
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. ...
1
vote
3answers
44 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 ...
1
vote
0answers
47 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 ...
1
vote
5answers
336 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 ...
0
votes
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 ...
0
votes
2answers
46 views

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 ...
4
votes
2answers
720 views

Reversed DIP Switch

Simple question, why does the LED lights up when the switch is off
6
votes
1answer
141 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 ...
1
vote
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....
5
votes
6answers
1k views

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 ...
1
vote
2answers
153 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 ...

1
2 3 4 5
10