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

learn more… | top users | synonyms

3
votes
3answers
317 views

How to solve this resistive network using divider rules and ohms law

I have a homework problem I've been trying to solve. So far I think I'm using the right formulas for the calculations. I just need help finding: The total resistance of the circuit, finding Vab ...
0
votes
2answers
38 views

Why is a receiving circuit in e.g. RFID made resonant with a parallel capacitance instead of a series capacitance?

Take for example the schematic below of a inductive receiving circuit in RFID, where we want to maximize the voltage over the load resistor R4 (R3 is the resistance of the inductive coil, and the ...
1
vote
4answers
48 views

What is equivalent Resistor different Resistors put them in series or in parallel if they have a different wattage and different resistance?

What is equivalent Resistor of two this different Resistor put them in series or in parallel if they have a different wattage and different resistance? In practice somtimes we have a resistor with ...
0
votes
1answer
45 views

Three series LED arrays in parallel, resistor value?

i know this is possible but not sure how to work out the resistor value needed... I should point out that I am re-using a PCB that has had all the components removed. I need 15 LEDs in 3 parallel ...
5
votes
2answers
303 views

Can I parallel multiple resettable fuses to achieve a higher current rating?

I have an application wherein I spec'd a fuse, rated for 80VDC 500A. The customer is concerned about what happens if they have to replace the fuse, it being rather difficult to access. They suggested ...
0
votes
0answers
42 views

How can I add a resistor in parallel to a rheostat while keeping it linear?

I have a 25Ω linear potentiometer wired as a rheostat. I would like a range closer to 5Ω, so I added two 10Ω resistors in parallel. This gives me a range of 0 to 4.16Ω which is just fine, but the ...
-2
votes
2answers
62 views

Double the current capability of a mains socket by wiring another in parallel [closed]

I have an appliance that I know draws more or less 16A under 240VAC, but I only have 13A sockets around. Is there any off the shelf solution?
0
votes
0answers
17 views

3s Lipo parallel usb charging board

I'm building a vaporizer and I would like to use 2 of these batteries in parallel. I don't want to keep removing the batteries and charging them separately I would like to just charge it through a ...
3
votes
2answers
60 views

Combine multiple voltage regulator?

Maybe this is very stupid question but I want to know if I can connect two or more voltage regulator (like LM7L05) to add ampere? Say if 1 is able to source 100 mA then combine 2 to draw 200 mA? Sorry ...
0
votes
2answers
64 views

Total current at the load?

Assume the voltages sources(InducedV1/V2/V3) are created by an inductor/or a strong magnetic field changing rapidly(or in anyway) the PS would power the load, however, there are induced-EMF's V1 in ...
0
votes
1answer
54 views

Help wiring multiple different colored LED lights

I am working on a project right now, and it is the first time that I have worked with wiring anything. I have 70 LED lights. 10 red, 10 orange, 10 yellow, 10 green, 10 blue, 10 purple, and 10 pink. I ...
1
vote
1answer
56 views

30x Incandescent light bulb in parallel ? + dimming

I'm trying to connect 30x small incandescent light bulb in parallel (1.5v / 300mA). But I'm having some issue designing the supply and dimming circuit. Does it just work like LED's for the ...
1
vote
1answer
45 views

Voltage Output of a Current Source in Parallel and in Series with a resistor

Hi All, I imagine this is a pretty basic question to ask but I'm struggling to get my head around this. I'm trying to find \$V_{out}\$ of the circuit above. Now I understand why \$V_{out}\$ can be ...
0
votes
0answers
36 views

Dc Motor drive setup

I would like to ask why in this setup the dc motor is parallel to the fet and what is the reason for the diode. Thank you!
2
votes
2answers
204 views

Finding the transfer function of this RC circuit

I have the following circuit and I need to find the transfer function: simulate this circuit – Schematic created using CircuitLab Considering the position of \$V_{\text{out}}\$, it looks ...
0
votes
1answer
57 views

Difference between a series circuit or parallel circuit in power generation?

I wanted to know the difference between the induced-EMF and current, in a series circuit layout, vs a parallel circuit layout. In a series the current would stay the same,however, the induced-EMF ...
0
votes
2answers
85 views

9x 1W LED's parallel + series resistor calculation help needed

I am struggling with the calculations of the current limiting resistor for my circuit so I wanna ask you guys for help. I've tried doing this calculations on online calculators and by myself with math ...
0
votes
0answers
63 views

Increasing output voltage, by inducing an EMF

I have a concept and wanted to verify it's possibility. I would like to induce and EMF that would increase the output voltage, but putting one of the wires in a parallel sub-circuit in a changing ...
0
votes
1answer
81 views

Figuring out the voltage at a point?

From the following diagram: simulate this circuit – Schematic created using CircuitLab What would the voltage be at point b? 5V? And for point a would be 10V? Likewise point a(10V) ...
1
vote
4answers
119 views

Are these resistors in parallel

There are 2 groups of resistors that look like they might be parallel, but in between them that's making me question if they actually are. The circuit looks like this: If they are considered ...
0
votes
0answers
56 views

induced EMF to a parallel circuit?

What would happen if a wire within a parallel circuit was placed inside a changing magnetic flux, and there is induced EMF, what would happen to the overall circuit? The voltage at point a is 20V ...
2
votes
2answers
77 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
87 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
4answers
262 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 ...
5
votes
3answers
633 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
82 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
45 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
68 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
44 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
90 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
109 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
170 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
79 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
61 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
190 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
93 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
67 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
112 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
93 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
1answer
173 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
214 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
82 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
777 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
232 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
116 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
124 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
96 views

Question on parallel resonance

I cant interpret what this question means. Can anyone help me answer it. Thanks in advance
1
vote
1answer
84 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
76 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
189 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? ...