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.

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33 views

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 ...
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0answers
32 views

Is my understanding of the roles of transistors in this circuit correct?

THE CIRCUIT'S FUNCTIONING This circuit is a rain water sensor circuit that buzzes when there's water on a probe.I found it on net.1 CIRCUIT COMPONENTS 3 Volts Battery BC 558 Transistor(PNP) BC 548 ...
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1answer
42 views

Building oscillating magnetic field circuit

I wanted to create an oscillating magnetic field using an electromagnet which is rated for 12V continuous duty. I was thinking that I need an arduino to control the electromagnetic circuit by using a ...
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1answer
76 views

What signals are expected on the connectors for this 12V Volkswagen Scirroco wiper motor circuit

EDIT: added a picture of a very similar unit. I picked up a used VW rear? wiper motor that I want to use for a simple motion experiment. Having no idea how to power the thing I popped open the case ...
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1answer
24 views

Designing RLC circuits at specific frequencies for teaching use

I need help designing simple circuits that resonate around specific frequencies. Basically I am looking for recommendations as to what size capacitor, inductor, and resistors I should get. Sorry if ...
2
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1answer
137 views

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 ...
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2answers
37 views

Voltage at node A respective to the ground

I want to calculate the voltage at node $A$ respective to the ground. $R_1=1.8\text{k}\Omega, R_2=3.8\text{k}\Omega, R_3=1.8\text{k}\Omega, R_4=5.8\text{k}\Omega, R_5=2.4\text{k}\Omega$ and $V1=4.3V, ...
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2answers
74 views

Designing a loaded voltage divider?

I was wondering how to design this circuit in depth, since I have no idea what to do.
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0answers
39 views

Methods for External Antenna Detection - RF systems

I’m designing an RF device that should be able to use multiples sets of antennae, one a low-gain internal PCB antenna and the other an external high gain antenna attached via an SMA connector. I’d ...
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1answer
35 views

How to minimize ozone production while ionizing air?

Right now I am using nine components intended for home air ionizers in parallel, I'd like to build one big one. I've heard that if one keeps the discharge voltage at -4kV, this produces negative ...
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2answers
30 views

Is learning VLSI design useful for a control/automation engineer?

I've known of a few universities that include a class about VLSI design as a part of their control/automation engineering programs. I undestand VLSI design to be about creating integrated circuits ...
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2answers
142 views

PC Controllable DC Power supply (0-30V)

I have a Proportional solenoid valve that uses a 0-30VDC for control (opening the orifice) I only have capability to provide 0-5V or 0-10V. I need to control the valve using my PC. Is there any DC ...
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2answers
188 views

I am trying to create an op amp based negative voltage regulator

I am trying to find simulate an op amp based linear regulator negative voltage regulator circuit. I have done the circuit for positive voltages, but does not know how to do it for negative voltage. ...
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0answers
29 views

what is the best way to communicate among multiple raspberry pi boards?

so i was planning to make a project were a system of computers( in my case raspberry pi's) need to communicate to do a certain job. And i am having a trouble choosing a way of communications. so i ...
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1answer
35 views

Voltage controlled switch?

So I am in the process of working on a rather strange and specific project. I am looking to capture as much energy as possible from a small steam turbine using a DC motor and then use that to power ...
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0answers
153 views

Difference between a positive and negative adjustable voltage regulator (LDO's)

I am having trouble understanding the difference between positive and negative adjustable voltage regulators (LDO's). There are circuit diagrams for the positive LDO's such as the following: I am ...
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1answer
96 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 ...
4
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1answer
148 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 ...
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1answer
88 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 ...
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1answer
197 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 ...
3
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1answer
563 views

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 ...
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1answer
72 views

Can different analog and mixed signal devices be combined on a single chip

Say I want N-ADCs, M-amplifiers, K-filters, and why not, an oscillator too. Is there a platform to combine whatever device i need, and that this platform is implemented on a single chip? I know an ...
3
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1answer
53 views

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 ...
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0answers
43 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 ...
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0answers
191 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 ...
3
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1answer
270 views

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)...
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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 ...
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2answers
2k views

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 ...
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0answers
54 views

Is there any hardware to use in GPR applications? [closed]

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 ...
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2answers
2k 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 ...
4
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2answers
138 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 ...
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1answer
81 views

Circuit that multiples two numbers together?

Design a combinational circuit that multiplies two numbers together, and outputs the result. The biggest product will be 3 * 3 = 9. Four bits to represent the product. ...
3
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1answer
273 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 ...
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4answers
2k 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 ...
3
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1answer
119 views

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?
2
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2answers
1k views

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. ...
3
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1answer
401 views

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 ...