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Questions tagged [circuits]

Use for questions primarily about circuit design, components, testing or other practical applications.

1
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1answer
34 views

Thevenin equivalent impedance in laplace domain

I can't understand why $Z_{th}$ doesn't include $3\ \Omega$ resistance.
5
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0answers
75 views

I want to understand this pneumatic circuit

I have trouble understanding the following pneumatic circuit diagram: I am new to reading circuit diagrams and i am unfamiliar with some of the symbols. I would appreciate if somebody could explain ...
0
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1answer
21 views

Utilize multiple vehicle power outlets to increase wattage capacity of inverter

I'm trying to determine whether it would be possible to use multiple power outlets in vehicle to increase the wattage that can be obtained. This question is driven from a desire to install an DC to ...
1
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0answers
48 views

Mosfet switching circuit

I am trying to make a MOSFET switching circuit where its gate input is 12V clock pulse. Now when I put the load between (Vdd) and (Drain), there is no drop voltage VDS, but when the gate input falls ...
4
votes
1answer
80 views

Simultaneously charging and transmitting data to an android phone using usb

Dear engineers, I have to make an engineering project which is a portable solar phone charger. One thing I need to do in it is to somehow charge the phone (android) from the battery (which is charged ...
-1
votes
1answer
68 views

How would I measure this battery circuit with a multimeter?

The wire is attached to the bottom of each D battery. I already know that I have to put the bottom of the light bulb on the positive side of the battery. My multimeter looks like this: I'm not sure ...
-1
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1answer
39 views

Using Stainless steel or iron pots in oven [closed]

Today I was using oven in my office with a plate of meal the plate was made of stain less steel, my colleague rushed and asked me to take it out otherwise the oven will be short circuit So please ...
3
votes
1answer
57 views

Replacement components?

I'm building a tracker for a high altitude balloon but some of the components are out of stock and may not be in before our launch date. I'm good with an iron but have limited engineering knowledge. ...
0
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1answer
63 views

Find average electron velocity on copper bus bar(um/s)

I was given this problem: A current of 1,400 Amps flows in a copper bus bar. The bus bar is 0.6 cm wide by 9 cm long. You can assume the current flows only on the surface of the bus bar (so you can ...
-2
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5answers
119 views

Which is the branch of engineering that deals with making gadgets?

Background I am currently preparing for Entrance Examination for Engineering college , somehow I noticed that I don't even know which branch I want to take and what is the kind of Education I am ...
1
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1answer
51 views

Adding an R2R Digital to analog converter inline with TRS connector

I am trying to create a simple R2R DAC, maybe 8-16 bits. I want to be able to that type of DAC inline to a headphone line. Since the an 8 bit R2R DAC will need 8 pins, how exactly do I wire up a TRS ...
0
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1answer
57 views

Help with two-port network parameters problem! [closed]

Help me, please. I im studying circuit analysis and i couldn't solve this problem.
0
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0answers
29 views

Total charge and significant figures

In the picture below I used the "change of charge" equation to measure the total charge that would pass a point in my simple series-circuit, per-unit time. In this case, due to the fact that my ...
0
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1answer
53 views

Measuring Current In/Out of Resistors [closed]

The banana clips attach to a multi-meter out of view, the power supply wires are correctly in place, and the resistors are correctly in place. Would putting the red left-hand banana clip and its ...
2
votes
1answer
72 views

Designing a Voltage Divider [closed]

I am struggling to solve this problem and my available time conflicts with my professors available time. Could any of you offer me some help, perhaps describe the method I would use to solve such a ...
0
votes
0answers
31 views

How to know for sure if a number is a don't care in KMAP?

I'm having a hard time with this. how can i know if a number was a don't care, for sure? For instance, given the function $f(a,b,c,d)=\sum(0,1,2,4,5,10,12)$ After a lot of trials, I know that this ...
2
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0answers
38 views

Comparisons of multiplier circuits

Could someone please explain some of the advantages/disadvantages of the wallace multiplier circuit vs a shifting and adding multiplier circuit vs an shift register multiplying circuit? We went over ...
1
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0answers
117 views

Calculating gain of an overall system. Analogue electronics

Our professor has given us a review for a upcoming exam. But he has never done anything like this question and it has stumped a quite few of us. We are hoping someone can walk us through this so we ...
0
votes
1answer
30 views

Is the current on the terminals of an opened circuit is zero?

Say we got this circuit: Initially we had the X resistance, but then I opened the circuit in the terminals of resistance X, and I moved the resistance X to the equivalent circuit (my teacher says ...
1
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1answer
112 views

Ideal op amp circuit with variable voltage gain, how do I calculate the current?

I am currently calculating various quantities for the circuit shown below. However, I am stuck on how to calculate the current (Ix) and the input resistance (0 output current). The circuit is an ideal ...
1
vote
1answer
25 views

How do they get more signals simultaneously inside a node of a neural network? [closed]

Why the circuit does not freeze/lock when the signals SUM ? But the electrical signals are SUM together in what sense? This question is about neural network circuits because I don't understand what ...
1
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1answer
342 views

Multi Ratio Current Transformers

I encountered a problem in measuring electrical energy using a multi ratio current transformer (CT). The catalogue of CTs is unavailable. I have little information about the type of CT I am using. I ...
1
vote
1answer
158 views

How the electronic circuit control laser diode? [closed]

I find this scheme here 1 - is data stream come from computer. This 'data' is an electric signal moudulated by the n°2 2 - this is the electronic circuit inside printer that a) activates the corona ...
1
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2answers
648 views

No Voltage appearing on Pspice

I am trying to compelte this question, however when i run the simulation there is no voltage atall on the output votlage, and cahnging the capacitor value as requested in the question does not chane ...
1
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2answers
50 views

Help with reading resistor color codes

I'm having a difficult time identifying a resistor's value as I can't find the golden / silver tolerance line. The problem is that I can't see a silver or gold line here! They're both brown on both ...
2
votes
1answer
92 views

Looking for a device that breaks the circuit if the voltage gets too low

I'm looking for a device that breaks a circuit once the voltage of my battery gets too low. This to protect the battery. Example: I have a 12V battery, once it reaches ~11V the huge voltage drop ...
0
votes
0answers
19 views

How are these bondgraph (de)composition rules for transformers and gyrators derived?

why does a C element through a transformer with transformation ratio n become $C/n^2$ and why does an I element through a gyrator with transformation ratio r become $I/r^2$? Source: Modeling and ...
1
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0answers
93 views

What are the various lumped element dynamic system models called?

What are the various lumped element dynamic system models called? By lumped element dynamic system models, I mean the various nodal models comprised of things that look like capacitors, inductors, ...
5
votes
2answers
112 views

Circuit Design Inductor Problem

I am having trouble finding a 3.4 µH through hole inductor that is in stock right now. I was wondering if I can just place 2 inductors that add up to 3.4 µH in series to solve this problem. I am not ...
-5
votes
1answer
84 views

In the equation for power as a function of current and resistance, what do the two factors for current represent?

In the electric power equation $P=RI^2$, $P$ represents the product of $RII$. I'm trying to understand the fundamental anatomy of the $RII$ term. More precisely, why does the current, $I$ appear ...
-2
votes
1answer
768 views

Transformers with no load [closed]

Could someone please explain why, when there is no secondary load, the applied voltage of the primary roughly equals the back EMF of the primary? Since the primary coil is an inductor I wondered ...
2
votes
1answer
41 views

Units for plasma etching of circuits: A (with degree symbol)/min

Background: I'm a statistician working with a design of experiments example regarding plasma etching of circuits, and unfortunately, the author does not define what is meant by the units used for the ...
3
votes
3answers
790 views

How do you find “this” Vx in the given circuit?

So I was told that $V_x$ is equal to 10V. I tried reasoning out why $V_x$ was 10V and this is what I got: -You can treat the Vx as an open circuit which means current does not flow through the ...
0
votes
3answers
281 views

Is battery-charge-stop-at-XX-percent circuitry not cheap? [closed]

I'm curious why IBM/Lenovo ThinkPad line is basically the only manufacturer/brand of mobility devices that includes circuitry and software that allows one to vastly prolong battery life of laptops ...
3
votes
1answer
261 views

What does this Logic Circuit do?

So I have to analyze this circuit, with inputs C0, A0, B0, A1, B1, A2 and B2, and outputs S0, S1, S2 and C3. It's been suggested I don't use a truth table to figure it out. I need to find out what the ...
3
votes
1answer
831 views

SolidWorks circuit simulation?

I use Labcenter Proteus Circuit simulation - you create circuit design, then apply current and see simulation in action - for example leds are blinking, or motor is rotating. If there is ...
0
votes
4answers
910 views

Is there current multiplier circuit?

Is there an electric circuit that can multiply the input current? if yes, what is that called, and how to make it? My input is DC from a small DC motor which I use as a generator. My input current is ...
4
votes
3answers
123 views

Help with closed loop heat controller (for a non engineer)

I am interested in setting up a controller which can modulate the output of 2 hotpads based on input from an infrared thermometer. The hotpads have their own dials, but I am considering controlling ...
7
votes
1answer
490 views

What does a Sad Face on a circuit board mean?

I have a Fisher and Paykel Washing Machine (model number WL80T65C, well past warranty) which got rained on (a lot) and one of the capacitors blew up. I've done an amateur replacement of the capacitor ...
1
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2answers
783 views

What is the purpose of the capacitors on LDO Regulator Circuit?

What is the purpose and benefit of the two capacitors on both the input and output pins of a LDO Regulator?