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.
53
questions
1
vote
2
answers
40
views
Dipole antenna calculations
I need a clarification about how to calculate the length of a dipole antenna.
For a 1/2 wave-dipole which of the formula is correct?
(140/λ) Or (300*10^6/λ)/2
Can a 1/2 wave-dipole dipole work when ...
- 11
-1
votes
1
answer
48
views
Is there a way to short a low voltage circuit remotely without physically touching it?
I'm looking for a way to short a low voltage circuit remotely without having to physically make contact with it. A preinstalled discharge or shorting circuit can't exist in this case. Just any random ...
- 201
1
vote
1
answer
136
views
Converting time constant to bandwidth of 1st order system
When the system is first order:
$1/(1+s\tau)$
Why is the bandwidth: $f_{-3db}=1/(2\pi \tau)$?
Where did the $2\pi$ come from? Why isn't it simply $1/\tau$? The unit of $2\pi$ is related to radian. But ...
- 13
0
votes
0
answers
32
views
CMOS AC-to-DC Converter Design
I am trying to analytically model the power conversion efficiency of an AC-to-DC power converter circuit (see Figure 1). In this design, the drain-source voltage of each MOS device can be expressed as ...
- 1
0
votes
0
answers
56
views
Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
0
votes
0
answers
36
views
How do I draw a circuit for a conducting loop inside a solenoid?
To solve a homework problem, I need to redraw the following diagram in circuit form.
The large blue circle represents the solenoid. Inside the solenoid, the two gray semicircles represent a wire loop,...
1
vote
0
answers
50
views
What should be the clearance and creepage for the line to line 440 Vac and line to neutral 240 Vac of the three-phase system on PCB?
Also is there any link to calculate this as per the UL and other industrial standards
- 11
0
votes
0
answers
59
views
How to build a 4-bit full adder that shows result on 2 7-segment LEDs, without using Arduino?
I'm required to create a 4-bit full adder (ALU actually), that displays result on 2 7-segment LEDs with both are common cathode, using only 74HC283, CD4511 and some other logic gates. I'm confused on ...
0
votes
2
answers
88
views
Why does a metastable state eventually resolve to a stable state?
I was studying with a book named "Digital design and computer architecture".
When I read the part of metastability, it stated this without any additional explanation..
Why does a metastable ...
- 101
0
votes
2
answers
236
views
How to make motor spin the other way
Let’s say I want two motors in parallel in a circuit (so they get the same Voltage), and wanted one motor to spin anti-clockwise and the other clockwise- is it possible?
I thought by flipping one of ...
- 13
1
vote
2
answers
367
views
Precisely control voltage output
I think the component name is a rheostat- is that what allows you to control the voltage output please? I want to control it in steps close enough to 0.1 ish volts? So I would like to attach a knob ...
- 13
0
votes
1
answer
58
views
How to Supply two different DC voltages using High Current
I'm trying to function a 12V stepper motor(>2.5A) and five 6V servos(>3A). Are there any reliable circuits that can output both these voltages and a high output current since there will be some ...
- 33
0
votes
2
answers
161
views
Circuit with Contradiction
What would happen in real life if you made a paradoxical circuit (a circuit whose output is on iff its output is off). Something like this:
Would the discrete model break down and the output end up ...
1
vote
1
answer
181
views
Electrical potential and grounding in a circuity, why it works?
I thought I understood the ground concept but now I'm a lot confused.
From: Pg.67 Practical Electronics for Inventors - Scherz Paul
As it's explained in the book, the first circuity is the one that's ...
- 25
0
votes
0
answers
19
views
Building drone transceiver module with 2 recievers onboard to switch gates ON/OFF to turn motors On/Off
I'm looking for any resource that can help me build a radio (no infrared) controlled circuit with two receivers onboard a drone. The purpose of this circuit is for research and education. Whenever ...
- 1
1
vote
1
answer
97
views
What are the charge/power connector of restaurant order pagers / buzzers called?
They look like snap buttons and used for stacking pagers for charging.
Closest things I can find are socket screws and cap nuts.
0
votes
1
answer
43
views
Explanation for photovoltaic circuit
My background is in Environmental Science, although I have recently been taught in the basics for energy engineering especially for solar panels.
I'm currently using PVsyst to build solar panels on a ...
- 105
3
votes
1
answer
532
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 ...
1
vote
1
answer
517
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 ...
- 153
0
votes
1
answer
428
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 ...
- 131
1
vote
1
answer
114
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 ...
- 13
2
votes
3
answers
812
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 ...
- 21
0
votes
2
answers
241
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, ...
1
vote
2
answers
248
views
Designing a loaded voltage divider?
I was wondering how to design this circuit in depth, since I have no idea what to do.
- 11
1
vote
0
answers
225
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 ...
- 11
0
votes
1
answer
73
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 ...
0
votes
2
answers
203
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 ...
1
vote
2
answers
571
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 ...
- 113
1
vote
2
answers
688
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. ...
0
votes
0
answers
47
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 ...
- 123
0
votes
1
answer
78
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 ...
1
vote
0
answers
317
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 ...
- 11
0
votes
1
answer
695
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 ...
- 106
4
votes
1
answer
292
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 ...
- 43
1
vote
1
answer
240
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 ...
- 229
2
votes
1
answer
402
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 ...
- 21
3
votes
1
answer
1k
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 ...
user12377
1
vote
1
answer
79
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 ...
- 21
3
votes
1
answer
61
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 ...
- 31
2
votes
0
answers
50
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 ...
- 131
1
vote
0
answers
277
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 ...
- 321
3
votes
1
answer
459
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)...
- 33
1
vote
1
answer
27
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 ...
- 11
3
votes
2
answers
3k
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 ...
- 87
2
votes
0
answers
61
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 ...
- 141
1
vote
2
answers
3k
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 ...
- 143
4
votes
2
answers
185
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 ...
- 43
1
vote
1
answer
113
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.
...
- 11
3
votes
1
answer
291
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 ...
- 31
0
votes
4
answers
4k
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 ...
user2338