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Questions tagged [circuits]

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

99 questions
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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 which might work but when taking the circuit…
Dave
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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 them by voltage instead. So my question is, what is…
Ryan
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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 them to me. In particular I have the following…
engi1
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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 sure if this would introduce any problems, if so…
user3897744
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How do I calculate voltage at an LED in parallel?

I have this circuit: If D2 was a resistance, I could just combine it with R2 to get some composite resistance that I could put in series with R1. That way, I could calculate the resistance of the entire circuit and, thus, the total current. Now,…
IceFire
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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 by solar panels) and simultaneously send data…
Uzzernaim
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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 resistor (meaning it's a short circuit) and thus from…
Steve
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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 circuit does by deriving expressions for the…
kb2712
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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 microcontroller - say AVR, you just load compiled hex file for…
sandric
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What's the most practical way to measure angular velocity for small rotations?

I'm looking to measure the angular velocity of an arm as it moves. It seems to be a difficult thing to research, since the term 'angular velocity/frequency' is usually reserved for other areas of circuit analysis. I imagine something like a…
Colin
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Thevenin equivalent impedance in laplace domain

I can't understand why $Z_{th}$ doesn't include $3\ \Omega$ resistance.
dragonhailstone
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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. Here is the list of components for reference:…
Jim Swarthout
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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 etch rate ($\mathring{A}$/min). A google search…
Meg
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What is the purpose of the resistor in this circuit

I am trying to convert an AC input into DC output using Diodes, and I found the following diagram for the circuit: I understand the diagram, but I don't fully get why the resistor has to be there, assuming that the V_out would be connected to the…
Tim Weigman
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Transferring the project from "Altium Design" to "SolidWorks" while maintaining silk-screen printing, sizes and everything else

I want to transfer the PCB project to solidwork from altium design, I read forums on how to do it better, and so: Save to STEP. The option is good and working, but I did not like the option, since silk-screen printing and tracks on the PCB are not…
Антон
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