Questions tagged [design]

The process of creating electronic products, including components and end-user devices.

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2answers
77 views

From sine wave to square wave

I want to make a square wave generator with na LM311. I have a variable sine wave source from 1Hz to 16kHz. The amplitude can vary between 0.5V to 11.4V. I tried to use the comparator circuit below ...
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3answers
67 views

Can I convert 5v 20mA to 12v 7a [duplicate]

I want to convert the 5v 20mA power from a digital Arduino output to a strong enough power for a 12v 7a motor. I do not believe the converter (linked below) I have selected will do the full extent of ...
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1answer
34 views

How do I calculate the x & y dimensions of pin 1 for a QFN package?

I'm trying to make changes in pad location. How do I calculate the x & y location of pin 1? Is there any mathematical calculation, how do I do those calculations? I'm sharing an image of a QFN ...
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2answers
79 views

Will this Step Up Converter solve my problem?

For a project I am doing at home, I need to convert a 5v digital output from an Arduino to a 12v digital output to power a motor. A solution I found for this is using a step up converter. The step up ...
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1answer
53 views

Creating multiple Ring oscillators and placing them through Hard macro

I am trying to place multiple ring oscillators using XDC macros. I have been able to follow the steps on the video by Xilinx on XDC macros and it worked. However, I am facing errors and critical ...
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0answers
49 views

how can I calculate Vb from the design specs?

I have derived from the design specs the conditions for vbmin and vcomp and rout but there are a lot of unknowns and limited equations The equations that I have derived are: Rout = ro2 + ro3 + ...
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1answer
41 views

Which topology is best to design a DC DC 120W Power Supply? Kindly go through details

My requirement is as follows: Input Supply 110+-30% VDC i.e., 77VDC to 138VDC. output need to be 24VDC 5A. All the basic protections like short circuit, Reverse polarity. No power consumption when no ...
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1answer
78 views

How do I select the transistors for this circuit? [closed]

I have no background in electrical engineering at all, and only bought my first breadboard this week. I'm still completely new to this and just trying it out. I'm trying do drive an 12V actuator, ...
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1answer
38 views

What is the best cable for a 3d printer wire bundle?

I am connectorizing my Ender 3's hot end through a 15-pin D-sub connector, so I can swap in an E3D hotend much more easily. I have previously done this with another printer, but I am updating my ...
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1answer
33 views

How to interchange between two cores (inside a coil) in a simple brushed motor

I am going to build a very simple brushed DC motor. The rotor will not be enclosed in a stator (the rotor will be built on a bench with free space around it), and I will using permanent magnets to ...
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1answer
48 views

Where can I find information on interfacing an MCU with an HDMI display? [closed]

I am just starting the process of creating a product that will have an HDMI display (not chosen), but I don't quite know where to start. I have never delved into the realm of Displays, and don't know ...
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0answers
32 views

8 bit divider can you help with it? [duplicate]

This is the vhdl code and it need more, can you help me? ...
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3answers
138 views

Need design best practice: microcontroller controlled, variable, DC voltage source [closed]

I need guidance on designing a Variable DC power supply with the following characteristics: Microcontroller controlled DC output ~ 1V - 30V Current handling: ~5 amperes Power handling: ~50 watts I ...
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0answers
53 views

How to convert a Boolean expression from POS form to SOP form?

POS equation is given as F=pi(3,8,12). By converting POS to SOP form directly I get F=sigma(0,1,2,4,5,6,7,9,10,11,13,14,15) But according to the process given in the above picture F is given as F=...
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1answer
68 views

Should I insulate between 2 PCB's when SMT joining them together?

I have designed a circuit board (5v, .02 amp max draw, UART and I2C comms) for an electronics project with many surface mounted components, which I have built and SMT from a house in China. When the ...
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3answers
392 views

How does the length of the antenna affect wavelength of the wave?

I want to do some calculation of how varying lengths of the antenna will change the wavelength of the wave.
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2answers
58 views

EC probe for hydroponics; physical design considerations

I want to build a simple EC-meter with two electrodes for a hydroponics project. A naive solution would just have the (copper plate) electrodes hanging into the water, but then the active electrode ...
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2answers
719 views

Why are all the MOSFETs' drains connected together and to nowhere else?

I was studying the schematic for the "Waveshare UPS HAT", just because I am a beginner and find it educational. This part is really confusing for me: Why are all the drains of those AO4406A ...
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2answers
62 views

Designing a common base amplifier to meet given specifications

I designed the circuit as below and I know that common base amplifier should have a unity current gain(usually <1) but I'm getting a very high gain. What might be the reason for this, is something ...
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1answer
80 views

Design a Cascode amplifier using suitable topology to meet the specifications( by Varying W/L ratio) . VDD is 3.3V

CONDITIONS Output swing has to be at-least 80% of VDD (> 2.64 in this case) . Power supply rails available are VDD and ground only. Only one current source can be used in the design IREF = 50μA. ...
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1answer
53 views

What is the standard procedure to design a Synchronous Machine?

I have Modelled an IPMSM based on the innovative idea i got. I have also decided on the rating of the machine, torque to be produced, Required Rated RPM, but after this i have so much doubt. whether ...
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0answers
27 views

Coil and PM Dimensional Ratios (BLDC)

I am in the process of laying out coils for a Axial Brush less Motor. My question is - without taking turns or power into consideration. Are there any design ratios - which should be attempted. When ...
4
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1answer
78 views

Why do European motorized appliances draw less inrush current than their American counterparts?

I have been trying to tease apart the history and evolution of arc fault circuit interrupter requirements, and in the process, came across a curious historical sidenote early in its genesis, namely ...
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4answers
80 views

How to determine which connectivity and peripherals are needed in a microcontroller?

This post goes a step beyond my previous question about microcontroller selection here. In short, I am a moving away from AVR for product development and I want to stick with popular manufacturer uC ...
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0answers
37 views

High efficiency buck-boost converters for 3.3V and 4V power rails up to 3A peak current

I need a buck-boost converter to power a 3.8-4.5V GSM module and a 3.3V controller from batteries. So I need a boost-buck converter that can give me a stable voltage over the lifetime of the batteries....
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0answers
45 views

About the 32-bit divider

I am currently working on a hardware design, its function is to realize the Taylor series of cosh. In it, I need to use a multiplier and a divider. They are both 32-bit input and 64-bit output. I ...
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1answer
62 views

Vce voltage bias

I am building a multistage audio amplifier with a 10V supply. I am wondering about the affect this point (collector voltage, 5.6668167V) has on the performance of the circuit. If, at the output, I ...
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0answers
23 views

Single PCIex4 to dual PCIex4 slot

I am designing a motherboard which requires 2 PCIeX4 connector, the standard PCIex4 connector and M.2 KeyM connector. but my CPU has only x4 PCIe_TX and 4x PCIe_RX lanes, but we will be using only one ...
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1answer
89 views

Design a BJT Amplifier to meet all the given specifications( Using LTSPICE)

Given Parameters: 1KHz 10mV sine wave as excitation(Vin) Specifications to be matched: Input Resistance(Rin) = 18 KΩ, Current gain = 33 dB, 3 dB Bandwidth = 425 KHz We are allowed to vary R2,R3( ...
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0answers
39 views

Would an LM7805 need a heatsink stepping down two stacked LiR2032/CR2032 (3.6V X2) batteries?

Okay, I'm terrible at anything electronic, especially when it comes to building from boards (think rudimentary understanding). I've built a few PC's in my day, but piecemeal, not from scratch. Keep ...
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4answers
2k views

What is the methodology behind 555 timer design?

Small circuits in TTL and RTL we could do intuitively, without any methodology. But what about a complex circuit like 555 timer? If it was designed using logic gates, it could be easily deduced by ...
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0answers
52 views

Decoupling on PCB - Filled Zones or Traces

Which of the two following PCB layouts for the given schematics (7805 voltage regulator) is better? Do filled zones affect filter/decoupling capacitors negatively? Thanks! Update: Second layer is a ...
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1answer
40 views

Using analog comparators to get 2 different outputs depending on the input

I am trying to use analog comparators to get two different output voltages, 6V out when the input voltage is -8.5V <= Vin <= -2V and -3V out when the input voltage is -2V < Vin <= 9.5V. I ...
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5answers
3k views

Why are multimeter batteries awkward to replace? [closed]

I teach introductory physics labs, and inevitably when we do our labs on introductory circuits or mapping electrostatic potentials, there are one or more multimeters whose batteries die or fuses blow. ...
3
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1answer
351 views

Inductor design tips [closed]

I should design an inductor which has these features: 3F3 magnetic ferrite material Temperature is between 35-70 celcius Copper filling factor, kc = 0.5 Max 10A DC or 10A AC 50kHz U type inductor 12 ...
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1answer
101 views

Momentary switch on-off circuit

I am trying to create a circuit to allow me to switch a project on and off with the activation of a momentary switch (a momentary push button or reed switch, for example), but I'm coming up blank and ...
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2answers
78 views

What wire to minimize my wiring loss?

(Please be gentle, I am a total novice when it comes to EE...) I'm working on a design for an "off grid" setup. For... reasons (see comments and edit history, but those details are ...
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1answer
26 views

shape plan design

I am a beginner in routing, I have sensitive signals on my PCB. I did the following routing as a first provisional but they asked me to make plane shapes at the voltage regulator. but i cant figure ...
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0answers
20 views

How to define new component origin in EagleCad board view

I have been trying to rotate a component in my eagle pcb board mode but the centre of rotation has been defined upon one of the pins of said part. (potentiometer) This is what I have done so far: I ...
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1answer
29 views

Why does the Vs node always oscillate around the second harmonic in a VCO tail filter?

Why does the Vs node always oscillate in the second harmonic even if we detune the Cf, Lf tail filter? Is Acos(2wot) always valid for Vs? How is it explained?
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1answer
37 views

Rotate Eagle CAD component about its origin

Could someone help me redefine the center of rotation for a component please? When I open the component in Eagle library I can see there is a little cross on one of the pins and at the moment when I ...
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1answer
28 views

Implement boolean function with given components

I have to implement these functions using the following components only $$F_1(A,B,C) = AC + BC'$$ $$F_2(A,B,C) = AC + B'C'$$ $$F_3(A,B,C) = A'B + AB'$$ Components given: 1:4 DeMux with active high ...
1
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0answers
88 views

Will this circuit for two Wiegand card readers allow them to talk to one control board?

I'm working on designing a PCB to allow two Wiegand HID card readers to be connected to a single control board using digital isolation IC's and wanted to make sure the IC's and other components are ...
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1answer
176 views

What's wrong in my low pass filter design?

I use the magnitude of the transfer fuction |H(ω)|=1/sqrt(1+(ωRC)^2) to calculate the wanted output/input ratio at 0.1. I use R=1kohms, C=0.5uF for a 20kHz noise input. Why do I get nearly nothing for ...
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0answers
52 views

Generic tablets and single board computers

I've been pondering the idea for a while now in regards to a project I've had in mind. Essentially, I was wondering how I would go about obtaining generic tablet/phone motherboard designs? Would I be ...
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1answer
22 views

Altium: Hierarchical Design not connecting properly?

So I've been meaning to design a board that has many repeated components; basically making the user of the board able to create a state machine with discretely implemented ands for next state logic, ...
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0answers
119 views

Communication failure using PCA9615 Differential I2C Bus Extender

I have used PCA9615 differential I2C bus driver in one design to extend the I2C bus over CAT5 cable. (datasheet https://www.nxp.com/docs/en/data-sheet/PCA9615.pdf) The design has been done according ...
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0answers
439 views

SIM7600SA 4g module to ESP32

I am in a middle of getting the required components for my project. I will be using ESP32 microcontroller and SIM7600SA module for 4g/lte.. Since, I am a beginner in this field, can someone suggest if ...
1
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0answers
32 views

How to connect a ENC28J60 or ENC424J600 to a KSZ8091 PHY and from PHY to an unmanged strapped configuration to a KSZ8863 or other switch

How would one go about connecting MAC chip to a PHY and then to a switch for dual ports for daisy chaining? Rather be a strapped configuration for use in unmanaged mode so no need for MCU software ...
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0answers
47 views

DDR3 Routing Guidelines

I'm trying to design a PCB including DDR3 rams, I don't have much experience and knowledge working with DDR3. What are the most important guidelines to help ensure good signaling for the DDR3 chip? I ...

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