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Engineering Stack Exchange

Questions tagged [circuit-design]

For questions about the design of circuits. This may cover everything from processing steps to models to high level circuit design issues.

49 questions
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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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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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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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Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and tweeter) for better quality for frequencies between…
Richard Bernard
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If I have multiple different DC voltage inputs, how do I get a stabilized output at an intermediate voltage?

Let's say I have $3$ DC lines input as $10 V (x A), 24 V (y A), 6 V (z A)$. Now I want to convert the output to say $16$ VDC at $k A$. What kind of converter can I use?
Antarix
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Thermostat design properties

Cut-in, cut-out thermostats are commonly used with refrigeration devices in order to hold a consistent temperature range. Their general operations is such that when the temperature by the probe reaches a particular temperature set as the upper…
user16
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What controls the gain in a BJT amplifier, and why does this circuit have a gain of unity?

In the case of the first circuit, The ratio between the input voltage Vin and the voltage at the collector and the ratio between the input voltage Vin and the voltage at the emitter are supposed to be around 1. In the case of the second circuit,…
user12377
3
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1 answer

How to provide conditional locking to drawers?

I am designing a device in which I want to lock each drawer until it's time to open them. Let's say that there are 4 compartments in the device. Each compartment needs to be programmed to open at a pre-programed time. For example, at T1 time,…
S_Learner
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Units for rotational impedance

I'm trying to use the mechanical impedance analogy to describe a spring mass damper system as an electrical circuit. Mechanical Impedances for linear motion are $$ Z_{lin}(s) = \frac{F(s)}{\dot X(s)} = Ms + B + \frac{K}{s} $$ where M has units of…
wyverniv
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Square wave transfer function?

I made a mathematical model (transfer function) of a rlc circuit. I simulated it in matlab simulink with step input and square wave input and observed the result. I can also calculate this system with step input since its transfer function is simple…
Taha
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Percent (%) error between calculated gain and measured gain of FET amplifiers

I've recently been learning about FET amplifier circuits and I'm looking for some information that can help explain why the calculated and simulated Gain Values can differ by up to 15% in some cases. this image is an example of the first FET amp. …
user146664
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How can I calculate overcurrent from over voltage for the AP9101C IC

I designed a battery charging, protection, and boost circuit for a project I am working on. However, I made a complete noob mistake and forgot to find the overcurrent value for the battery protection IC I am using, and it turns out the overcurrent…
David White
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Designing a Voltage Divider

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 problem in a way that I can learn from it? Thank…
wsamples
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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 them briefly in class but didn't get to in depth…
windy401
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Is there any hardware to use in GPR applications?

I want to make a radar system which needs to send EM wave and receive the reflected wave from the ground. I am looking for a ready to use RF signal processing hardware but can't be sure which is applicable. As I found that, the required frequency…
freezer
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