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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75 views

how to control power within a triangle automatically

I have two mains powered extract fans with sensor operated controllers. I need to add a third extract fan that will run if either or both of the other two are on. How do I wire this so to prevent ...
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2answers
203 views

How to split up voltages

I want to power up bluetooth receiver module (input voltage 3.7) and audio amplifier module which accepts only 2.4 - 3.7 voltage, exceeding which already burnt the IC. So i got new one. I'm having 2 x ...
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What is the Gain, Input and Output Impedence in this circuit?

So I'm trying to know what the input, output impedence and gain is in this circuit To begin, I'm kind of confused since I don't know if those two resistors at the right are in series or in parallel.
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215 views

Wiring up a current limiting resistor with an IR LED burns of the LED

I have a 5V DC supply and i am trying to wire an IR led with a resistor in series to it. I have wired it up to a bread board as shown in the pic The current limiting resistor value is ~ 216 Ohm. ...
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1answer
97 views

Doubt with current across several resistors (serie) and Resistor Power Rating

I have read that the current that flows across a circuit of several elements connected in serie is always the same but, as far as I understand, resistors consume current and disipates it in form of ...
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104 views

Can I sum up multiple, alternating series capacitors and resistors like this?

When the components are between each other, can I sum up multiple, alternating series capacitors and resistors like this? Thanks.
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1answer
334 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 ...
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1answer
625 views

Converting DC to AC power supply [closed]

I have a simple wiring question. I want to convert a LED light that uses 2 AA batteries, to AC power supply. I have 3 of these lights. I'm assuming each light uses 3V for a total of 9V. I have a 9V ...
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1answer
81 views

Why or when does battery capacity matter in a series circuit?

I have 3 sets of doubled 18650 cells from a laptop battery, and I gather that it can be dangerous to use cells of different capacities in series. This question is more about the theory than practice. ...
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1answer
1k views

What is the miminum voltage for series NiMH pack?

Suppose a pack of 8 AA NiMH cells are serially attached and its known NiMH cells should not go below 900mV per cell. Does this really mean the pack should not be discharged past 7.2v?
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High voltage input and low voltage capacitor in series safety

I’m working with a car battery that has a voltage drop when cranking the engine. As a result of this, the stereo restarts even though it was running already. To resolve the issue of stereo rebooting ...
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1answer
109 views

Why is this pair of electric brakes not working in series (as intended), but works in parallel?

My uncle has a 48V electric boom lift that sat for awhile and we're trying to get up and running again. We had a lot of stuff replaced and refurbished and we're almost there, but there's one last ...
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pn junction in series i-v curve

If i have \$p^+n -pn^+\$ junctions in series how should the i-v curve look? my guess is that because they have the same orientation in the meaning of forward/reverse bias so it's should look like ...
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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 ...
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3answers
765 views

Thevenin Equivalent Resistance of complex circuit

I'm trying to find the Thevenin equivalent of a circuit of which I have already found the Thevenin voltage. Unfortunately I can't figure out how these series parallel combinations work to find the ...
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1answer
161 views

What is the proper way to dim LED pods?

I am trying to properly wire and then dim Cree LED tri-pods (3 LEDs on a disk). The spec sheet appears to read that the way to connect 2 * tri-LED pods (6 individual LEDs in total) would be in series,...
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2k views

Supercapacitors in series

Can I charge series of 4 Maxwell BCAP3000 supercapacitors with constant current method using an adjustable Power Supply, and exceed the voltage rated for single cell? What I mean is to charge the ...
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458 views

Capacitors, ground between connection, Colpitts oscillator

For the Colpitts oscillator circuit shown (from a YouTube video), the video author said that the capacitors C1 and C2 are in series, which makes sense since there is a common connection point for C1 ...
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1answer
71 views

Confusion about inductors in series vs. combined

I suddenly was getting confused while reading about inductors. The formula for inductance I was using was the one like in the answer to this question. However, I have also read that the inductance ...
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2answers
426 views

Simplify a circuit with current sources

Can I simply the circuit in this way? If not, how then?
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2answers
210 views

How to Power 2 devices at different voltages with the same set of power source(batteries)

I'm just curious if it's possible to power 2 devices at different voltages with a set of batteries while making sure that the 2 devices makes use of all the batteries. I have here an illustration of ...
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1answer
84 views

Least sub-optimal configuration of flooded lead-acid cells with different capacities

I am aware it's best to use cells of the same capacity, same age, etc. However, until I can replace the cells I have I need to make use of these. The batteries I have are 2V flooded lead-acid cells, ...
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3answers
303 views

Three diodes in series rectifier

So, I want to make AC 220V to DC 220v rectifier. Can I use two or three diodes in series, because the reverse voltage maximum of one diode is about 60 volts?
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1answer
2k views

Series-shunt feedback analysis

Microelectronic Circuits by Sedra/Smith present a method to analyze series-shunt feedback circuits by separating the 'A circuit' from the 'B circuit' in which h11 and h22 are consolidated into the 'A ...
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123 views

Power handling for series connected diodes

I guess it's a fundamental question... Let say I have a diode_1 that can handle 1W power and another diode_2 that can handle only 0.1W power. If these two didoes are connected in series (diode_1 ...
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3answers
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Batteries connected both in series and in parallel

I am confused. Some sources say that connecting batteries in series also doubles the amperage (not only voltage) while maintaining the same mAh rating, while connecting them in parallel only increases ...
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1answer
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How do I find the power factor and the equivalent inductivity value for this given scheme?

My exam is in 2 days and I just can't figure this thing out. I have the following scheme: First I was asked to find out the impedance, resistance and reactance of the dipole given below. This is what ...
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Replace in-series incandescent lamps in a makeup mirror with LEDs

This is my first post here. My wife uses a makeup mirror which has 10 x BA9s in series. Each lamp is 3W 24V and since we are in Europe they run on AC 230V nominally (reading off a multimeter is ...
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2answers
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Connecting lithium and lead-acid in series

I have a 48v 12Ah lithium battery pack, and I want to connect one or two lead-acid batteries of 12v 12Ah to it to make it 60v or 72v 12Ah. I can charge it with a 60v or 72v lithium charger. Will this ...
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1answer
193 views

What's the equivalent resistance of this circuit?

I am a student in 10th grade and our teacher gave us this schematic to work with (Remade with circuit lab): simulate this circuit – Schematic created using CircuitLab He asked us to find the ...
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1answer
47 views

can I charge 2 batteries in series

Can I charge two lithium ion batteries connected in series? What is more efficient, series or parallel in terms of charging? Thank you for answering this question.
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1answer
625 views

Sawtooth Wave Fourier Series - General derivation and Matlab issue

I am working on one of my first Matlab projects. I am trying to graph a sawtooth wave with 10-V Pk-Pk, 0-V average value. 50% duty cycle, 2.5 khz. I first attempted to find a general equation for ...
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2answers
663 views

Why is only one out of 2 batteries is discharging when connected in series?

I am using 2 Lead-acid batteries to run a DC motor. (Say battery A and /battery B). Both had potential of 12V before starting the motor. After two hours of running the motor, battery A still had ...
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3answers
987 views

Connect two lab bench power supplies in series safely

Lets assume in European Union, that I have two power supplies, that each have 3 terminals. One marked +, second - and third GND. I assume that GND is connected to the protective earth of AC power cord ...
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3answers
3k views

Solar Panel Not Charging Batteries in Series

I live in a remote part of Tanzania with no mains electricity. We have had solar power for some time, but on purchasing a new inverter, battery and extra solar panels have run into problems. The ...
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1answer
110 views

Motor Driver IC - Motor Supply with Capacitor in Series

I'm trying to figure out what should be the voltage rating of the capacitor in series to VHS pin of TMC2660 driver. And also how is the voltage of the VHS pin is calculated for 24V motor supply ...
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2answers
170 views

High current in Coil/Inductor

I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high ...
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131 views

What am I actually missing?

While I was reading a physics textbook, I've seen something unclear, which is about ΔV. What does this book actually mean by ΔV? It seems like it is potential difference, right? However, the thing I'm ...
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2answers
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Find resistance r1 and r2 using vin and vout

I have tried everything.I have tried all voltage divider rule but i need atleast r1 or r2. Can anyone help me understand to solve it? No need of solution just set me on right path.
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1answer
943 views

Resistor and Incandescent Lamp in Series

I’m new to electronics and am trying to ground myself in basic concepts. On my test circuit board I have a 5.08V power supply, a 200 ohm resistor and a 1.5V incandescent lamp in series. The voltage ...
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3answers
110 views

multiple 1.5v devices from one 9v power supply

If I have 6 battery powered wall clocks each powered by a single AA battery, can I wire the clocks in series and connect to a 9v power supply (assuming the amperage is covered)
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1answer
162 views

Finding the voltage range in a series circuit [closed]

Given a DC circuit with 3 resistors connected in series and the following information: The resistance of R1 is 2 ohms. The voltage over R2 is 20 volts. The power dissipation on R3 is 25 watts. ...
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1answer
201 views

Questions About Charging Lithum Ion Batteries

I have a few questions about charging Lithium Ion Batteries aka a collection of cells...im learnin...lol 1) I am looking to setup 14x18650 cells to make a 51.8v module in series. I know I need its ...
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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 ...
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1answer
1k views

Using Audio Jack Switches as Paralell/Series toggle? (guitar amp and cabinets)

I have a guitar amp that has one output that can handle either an 8 or 16 Ohm load. I have a cabinet with two 8 ohm speakers (each with a separate input). I could wire the speakers in series, and get ...
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0answers
244 views

Has anyone ever seen this transmission line setup (double series terminated)?

I am designing a custom PCB interface to be used with some off-the-shelf devices. The relevant off-the-shelf interface they provide is cumbersome and doesn't fit my application, so I am designing my ...
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1answer
819 views

Can I use 3v CR2032 to power multiple vibration motors?

I am planning to use a 3v Arduino pro mini with 2 coin cells (3v CR2032 each). I also need to connect 6 flat vibration motors in series rated as follows:- Rated Voltage: 3v, Rated Current: 70mA Can ...
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3answers
737 views

Combining two exact USB battery packs in parallel to increase current in a simple fashion?

I am wondering how I could put two USB battery packs in parallel together in order to increase their amperage/current. I do not want to tamper with the Battery packs, as breaking them apart and ...
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2answers
788 views

What are ways of isolating/splitting one DC power source

I'm building a 6S Lithium Ion battery pack with a nominal voltage of 22.2v. The pack will be enclosed so taking the batteries out to charge them is not practical; therefore, I'll need to add the ...
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1answer
123 views

Can Inductor force abrupt current change through another inductor?

Say the 3H branch of the circuit was connected to the 1V source for a long time such that 500mA current is flowing through the 3H inductor. Then after long time the switch was connected to 1H ...

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