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

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2
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2answers
50 views

2 LED Parallel circuit help?

I need to make a circuit with 2 leds, 1 green 1 red. If the current flows, green led will light up, if there is a break in the circuit (open circuit) it will light up another led as red. I don't ...
4
votes
1answer
37 views

Recommended Layout for Parallel Current Sensing Resistors

I'm working with 12V DC systems and high currents (up to ~40A). In order to meet the wattage and price requirements for my design, I'm using two parallel sense resistors. The IC I'm using for sensing ...
2
votes
1answer
52 views

How many LiFePO4 cells can be in parallel?

How many lithium iron phosphate (LiFePO4) can safely be connected in parallel, in order to achieve higher power output (and capacity)? Wired directly together, without components such as resistors or ...
-4
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0answers
39 views

What is the standard DB25 parallel port pin outs of old computers?

What is the standard DB25 parallel port pin outs available in old computers?
5
votes
3answers
563 views

Meandering traces necessary for 24-Bit parallel RGB LCD interface?

I am working on a project that interfaces an Atmel SAMA5D3 MCU with a LCD TFT display. The interface between both is 24-Bit parallel RGB with HSYNC and VSYNC signals. The resolution of the display is ...
0
votes
1answer
61 views

Parallel circuit and Ohms law

Theoretical questions with ideal components.(R2 is 10 Ohm) 1) parallel circuit. R1 and ammeter, If I have a parallel circuit of 2 resistances, both zero Ohm, the current would split to 2 and each ...
0
votes
1answer
36 views

Multiple DTMF circuits able to detect the pressed keys but fails to read caller's number!

This is a follow-up question of "Multiple DTMF circuit interfaced to one microcontroller, will it work? Multiple DTMF circuit interfaced to one microcontroller, will it work? I used the ...
0
votes
2answers
49 views

Connecting resistor in LED parallel circuit

I connect 3 LED in parallel with a two AA battery source 1.2V each. As i searched in the web i realized that it is not correct to connect them without a resistor as they may get damaged. How mane ...
1
vote
1answer
43 views

Creating two branches with similar current using capacitors/resistors

I am studying for my midterm practical and I am stuck on a basic question. Below is a circuit that will help explain (made in Multisim). So, we are given this basic structure. All components must ...
0
votes
1answer
84 views

Transistor amplifier circuits

What is the ac collector resistance for the transistor Q1? I am having trouble finding which resistors are in parallel with each other in the circuit above. I want to find the voltage gain and power ...
1
vote
1answer
92 views

using double powersupplies

I have 2 computers (home PC's). Both are connected to the internet through a router/switch. The router is always powered, regardless when one (or both PC's) are going standby. Idea is, to power the ...
3
votes
3answers
142 views

Why can't you divide a series + parallel circuit into branches to get total current?

Suppose we have a circuit like this where \$R_1 = R_2 = R_3 = 1\$ simulate this circuit – Schematic created using CircuitLab Why can we not divide this into two branches, \$ B_1, B_2 \$ ...
1
vote
3answers
68 views

connect series of batteries in parallel?

I have eight sealed lead–acid batteries connected to my photovoltaic array in the way you can see in the image below. A friend told me, that it was a bad idea to put those light-green cables in the ...
0
votes
1answer
38 views

Series vs parallel for microphones (electric guitars)

I want to create a passive "mixer", with which I can connect two of my guitars to one amplifier, so basically one with two 6,3" input jacks and one for output. For passives without a transformer as ...
0
votes
3answers
133 views

Parallel RLC Step Response with Voltage Source

I am learning about RLC circuits in my Circuits Analysis class and I had a question regarding Parallel RLC step responses. In the book, they only provide examples of RLC circuits with a current ...
1
vote
2answers
72 views

How does wiring resistors in series and parallel affect their errors?

In an experiment I am conducting, I am trying to measure low currents by wiring a radio device in series with a small-resistance resistor setup, composed of 9 of 1 ohm +/- 5% resistors in series and ...
0
votes
1answer
59 views

Adding phasers in a parallel circuit problem

Below is a practice question that I am having trouble progressing further with. The (abbreviated) question and progress as follows: A circuit of 90V's supply is in parallel with two branches. Branch ...
0
votes
3answers
90 views

How Do Batteries Behave In Series-Parallel (Verify)

Hi I am confused about How batteries behave in series and parallel. I read online and saw that as you stack more batteries in series, the voltage adds together and the mA's stay the same, and if you ...
0
votes
0answers
75 views

Concerns About Solar Charging Tree House Lights

I'm Building a lighting system for my tree house with 4 LED work lights I picked up at the hardware store. I want it to have solar charging and be operable via one switch. Theres alot of background so ...
2
votes
0answers
119 views

how to parallel mosfet

i want to build induction furnace i parallel 16 power mosfet(irfp460) 8 fet for high side and 8 fet for low side for half bridge i use ir2104s and bd139 and bd140 totem pole for drive mosfet. like ...
0
votes
3answers
149 views

Simplifying Series/ Parallel RC circuit

I was doing some exercises on transfer functions and ran into this RC Circuit. I thought that I was allowed to add up the two resistors since they are in series. Which makes that the voltage across ...
0
votes
1answer
71 views

Issue replacing 27C256 ROM with 62256 RAM

I'm trying to replace a 27c256 ROM with a 62256 RAM, to be able to easily change the memory content. I thought this would be pretty straight forward. Not quite, it seems. I made an simple ...
1
vote
6answers
652 views

Single LED connected in parallel to conducting wire does not light up

LED connected in series to resistor. All is well. This doesn't work. Neither does this. This would be the schematic diagram. simulate this circuit – Schematic created using ...
1
vote
3answers
198 views

Does running parallel circuits for LEDs decrease their output?

Sorry if the questions here are elementary but my electrical knowledge is limited. I am planning to build an aquarium light fixture and I am having trouble grasping how to best use a driver. The ...
2
votes
2answers
105 views

Multiple DTMF circuit interfaced to one microcontroller, will it work?

I already tested this circuit with only one modification, I changed the R2 to 300kOhms which worked in my case. I interfaced this circuit to a microcontroller where they shared a common ground. I ...
1
vote
3answers
109 views

Simple RS232 to 8 bit Parallel circuit

I want to make a simple rs232 to parallel (8 bit) converter. I would like the input to 1 wire and the output can just be 8 bit with no strobes etc. and run at high speeds (ideally up to 1Mbps, put ...
1
vote
1answer
87 views

Question on parallel resonance

I cant interpret what this question means. Can anyone help me answer it. Thanks in advance
1
vote
1answer
81 views

Final voltage of two parallel (switched) capacitors

I am trying to obtain a resistance-circuit equivalent to a switched-capacitor circuit. It is the first stage of a ladder filter. simulate this circuit – Schematic created using CircuitLab ...
2
votes
1answer
70 views

getting more from batteries via series connection

Let's assume I have a 100W load. If I run this load on two 2000mAh 3.7V batteries in parallel then I should get a continuous run time of 8 min 53 seconds (given the 27 amp draw). However if I were ...
0
votes
1answer
166 views

RC Filter Circuit Question

Given the image below, we know that the second filter circuit is a Passive Low Pass Filter circuit. I'm assuming it is still a Passive Low Pass Filter with a different corner frequency. Am I correct? ...
0
votes
2answers
64 views

Constant current power supply and 2 LED - series or parellel?

I have a very limited understanding of how current works in parallel or in series. I am trying to connect a pair of LEDs to a constant current power supply (1200ma) in which the power supply ...
0
votes
2answers
152 views

Calculating resistance of series/parallel circuit

If I have a configuration of 5 resistors as follows: simulate this circuit – Schematic created using CircuitLab How can I calculate the expected total resistance between A and B, given ...
1
vote
1answer
115 views

Panic button alarm system circuit [closed]

I'm a homeschool mom with absolutely minimal knowledge of electronics. How should the following panic button alarm system circuit look? Four cells connected parallel or series, two panic buttons ...
0
votes
2answers
198 views

Can 2 boost converters outputs be put in parallel at the same voltage?

I have a slight doubt here. Can the outputs of 2 boost converters set to output the "same" voltage (isolated, they would never be exactly the same obviously) be safely tied together, as long as there ...
0
votes
2answers
76 views

Principles of Electronics Question Parallel Circuits

In a four-branch parallel circuit, there are 10mA of current in each branch. If one of the branches opens, the current in each of the other three branches is a) 13.3 mA b) 10 mA c) 0A d) either (b) ...
0
votes
2answers
87 views

Solar Panel Cellphone Charger - Not Enough Current?

The Materials : 1) 3 X 1.5W 6V Monocrystalline panels @ 320mA 2) DC-DC Variable Voltage regulator 3) 3 X 1N4001 Diodes The Problem : - I have connected the panels (which give about 203 mA ...
0
votes
1answer
122 views

Can I overload resistors when they are in parallel?

I have 10 x 100 ohm, 1/4 watt resistors in parallel, to get a total resistance of 10 Ohms. I do not have a datasheet for these, so I cannot look up the maximum ratings or anything like that, so I ...
0
votes
3answers
241 views

Can I just connect two CR2032 batteries in parallel?

I'm designing a device with a small current draw that will mostly sleep in a very low power mode and I need to use button cell batteries due to a limited thickness. I would like to double time between ...
1
vote
1answer
80 views

How will unmatched lithium-ion cells in parallel react?

We are stocking a portable power pack for USB charging. We tested them when they first arrived and found no issues but after 3 months we tested some of the remaining stock and found about 50% of them ...
1
vote
2answers
161 views

Voltage not dropping in circuit

This schematic shows the circuit that I'm trying to build. At the moment I'm not using V2, as I'm having a problem with V1. From my understanding the diode should drop the voltage by about 0.7V, and ...
0
votes
1answer
93 views

Series and parallel transformers?

I have two different transformers. The output of the first one is 15 volts and 1500 mA. The output of the second one is 5 volts and 500 mA. If I connected them in series (to get 20 volts) what will ...
0
votes
1answer
138 views

Connecting batteries in parallel (concerns)

I have been trying to understand if it is possible to connect two identical batteries in parallel (same: number of cells, manufacturer, capacity, CRate, usage). I want to create a circuit to select ...
0
votes
3answers
185 views

Why do different colored LEDs interfere with each other when connected in parallel? [duplicate]

My very basic electronics education has taught me that parallel circuits are equivalent to separated circuits. To my surprise, when I was playing around with some electronics I found the following: ...
6
votes
4answers
662 views

Is a two-element circuit series or parallel?

Is the voltage source in series with the resistor or is the voltage source in parallel with the resistor? If the voltage source is in parallel with the resistor, then why do they share the same ...
0
votes
1answer
71 views

Calculating R with 2 resistors parallel

I've ran into a slight confusion. The equation for resistance in a parallel circuit should work for any number of resistors, I assumed. So when I'd have 2 resistors in parallel, total Rt would be: ...
11
votes
3answers
956 views

Parallel Capacitor Conundrum [duplicate]

I have recently taken on a project that involves improving a circuit and there is a couple of instances where there are two capacitors in parallel with each other. The values of these capacitors ...
5
votes
3answers
442 views

For the resistor circuit shown in the picture, what must be the missing resistance to give a total resistance of 252 ohms?

After my calculations, I keep getting 1100 ohms, but the back of the book is saying 85 ohms. 85 seems to fit in better with the other numbers, but I can only get 1100 to add up. Here's my ...
-3
votes
2answers
67 views

Parallel circuit with equal resistance?

If a parallel circuit has 3 paths, all the same resistance will the current divide by 3, and will the voltage throughout all of those paths be the same?
0
votes
2answers
134 views

Can you use rectifiers from different transformer sources in parallel?

Consider following circuit: simulate this circuit – Schematic created using CircuitLab It uses two transformers, rectifies their output separately (so that they can't interfere), filters ...
0
votes
1answer
623 views

Can I control multiple stepper motor drivers from one controller?

I need to drive 6 stepper motors in open loop with 1/4 microstepping. The application requires all 6 motors to move by the same number of steps at the same time. There are no sensors of any kind on ...