Questions tagged [design]

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

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77 views

Design decisions about computational hardware for small mechatronics project [closed]

I've recently started learning electronics/mechatronics. As part of my studies, I've been reading about devices such as RaspberryPi, Arduino, etc, and I'm interested in experimenting with such devices....
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14 views

About CAN-FD, controller and transceiver separeted or controller with integrated transceiver?

I want to add CAN-FD capabilities to a automotive scan tool. My microcontroller does not have embedded CAN-FD controller, so, I will need a controller and a transceiver. But I am in doubt if I use an ...
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1answer
33 views

S-parameters vs device model

Many vendors provide both S-parameters and simulation models for their devices. Having encountered device models that when simulated, don't result in exactly the same S-parameters as the touchstone ...
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2answers
36 views

Systematic ways to design a finite automaton whose input-output function or relation is a given one? [closed]

Given a function or relation, are there some systematic ways to design a finite automaton whose input-output function or relation is the given function or relation, assuming there is at least one such ...
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51 views

How can I prevent microwave radiation absorption by a camera lens/electronics inside the microwave (behind the shield)?

Let's say I put in an endoscope like camera with the lens at the inside edge of the box and the wire behind metal sheet. Here's a mockup: Possible idea: The lens is behind a holes but the hole is ...
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66 views

I want to design a joule thief circuit with input of 2mV and output 1.5V

I want to design a joule thief circuit having an input of 2mV and output of 1.5V. I searched for low input joule thief (JT) and I found that by using ALD110800/ALD110900 (they have zero threshold ...
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2answers
58 views

How to fix common error causing multiplexed LED segments to flash and dim

I bought an electrical engineering book and was surprised to see the following figure showing how to use a microcontroller to multiplex 4 LEDs using only 4 pins: This seemed right, logically, but ...
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2answers
38 views

RAST 2.5 pcb design

Currently I am designing a pcb and I need a RAST 2.5 connected to my board DIRECT MATING as seen as picture below (example from google). But as I am searching in the library, I am using EAGLE, I ...
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2answers
53 views

Why is component spread a figure of merit for analog filters design?

Sometimes I read that in analog filter design, component spread is a figure of merit. The lower the better. What is the advantage (or disadvantage) of having a low (high) component spread? The only ...
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49 views

Circuit design for bluetooth ESP32 in my truck

I've been working on this circuit for a few months now with lots of research. Looking for the gurus on here to analyze this board and give me some suggestions/corrections moving forward on parts/...
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1answer
53 views

Logic circuit to separate odd and even pulses in a pulse train and indicate using LEDs

Logic circuit to separate odd and even pulses in a pulse train and indicate using LEDs in a digital logic design was the question. so How to construct a circuit diagram in this situation?
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2answers
39 views

How much time to I have to switch outputs on a CD74HC4067 multiplexer?

Looking at this datasheet, how do I determine the amount of time I have to switch between one connection and another? It seems that as I switch from one connection to another I will go through ...
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1answer
75 views

Audio amplifier design problem

I am trying to design an audio amplifier circuit using BJT These are the requirements of the circuit Input signal: 50-100 mV (It's the output of my iphone's mic) 2W-4ohm speaker There is no ...
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48 views

Build a T flip-flop with enable and reset using only a JK flip-flop (without enable or reset) and some necessary logic gates!

So I was told to make such circuit asked above, I am thinking that if Enable is low then Q(t+1) will be just Q(t) (like 'keep') while if enable is high then check Reset, if reset is high then Q(t+1) ...
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43 views

A novice question about mixed signal IC design

As far as understand, a digital IC like a DSP can be design by RTL methods and by using languages like Verilog and VHDL. And if I'm not wrong, we cannot yet program pure analog chips by using a ...
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I am trying to instantiate few modules to work in top level design, but even though there is no error but I am not getting proper output

This is my verilog code. Though I am not getting any output, if any two of the instantiated modules are commented then I am getting proper partial output(For full output I need all of them to work). ...
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26 views

How does this board achieve snapability (ESP8266 programmer) for a SMD IC? [duplicate]

There is a programmer for the ESP8266 that allows you to snap the ESP module in and out of the board to program without soldering? I never seen this type of connector before, does anyone have a part ...
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1answer
62 views

Wiring up 3 alternative power supplies for a new system [closed]

A new system requires 3 alternative power supplies: On-board PSU 110V~ to 12V= Onboard 12V= battery External 12V= vehicle battery through cigarette lighter socket. I am looking out for suggestions ...
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1answer
58 views

How to draw the stick diagram of a JK flip flop

Recently me and my friends have been tasked a project to design a frequency divider using a JK flip-flop (divide by 4). After drawing the transistor circuit, I noticed that it was complicated for me ...
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1answer
27 views

Simulating NMOS as capacitor example

I would like to ask your opinion regarding NMOS test-bench as a varactor (voltage control capacitor). I am trying to find the properties of Vg,W for achieving a \$200fF\$ capacitor. Here is my test-...
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2answers
41 views

Downsizing wire for harness

I'm making a harness for a fan assembly. The wire gauge for the rig is 18awg but the fan assembly connector uses 22awg which means I need to adjust the wire size at some point between the two ...
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1answer
43 views

Why isn't my the LTspice cutoff frequency for my multiple feedback low pass filter not matching?

I am designing a 6th order multiple feedback lowpass filter with cutoff frequency at 1000 Hz. I wrote a matlab script that calculated the capacitor and restore values. I combined all transfer ...
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1answer
46 views

What to look for when selecting an RF detector diode

I'm currently diving into the topic of RF detectors and I ask myself which are the key criteria when choosing a diode for a given frequency range. I have a simple detector using a 1N916, which works ...
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1answer
48 views

Controlling a relay with a MCU output pin and trying to drive a solenoid using the same power source

I've used a known circuit design to successfully (wait for it!) control a 12V relay using a 3.3V MCU pin, from the pictures you can check that I am using the same 12V power source for both (relay and ...
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3answers
66 views

Suspending a Nichrome Heated Coil?

Scope: The scope of this project is to repeatably light several fireworks simultaneously (Mandalorian Whistling Birds Vambrace build). This requires that the only action required to light more ...
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34 views

How to fix incorrect cutoff frequency using multiple feedback butterworth lowpass filter

I designed a 6th order low pass Butterworth filter using multiple feedback topology (Fc = 500 Hz). But when I run it in LTSpice, the cutoff frequency is seen shifted far below to around 10Hz. Why is ...
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1answer
265 views

Simple Audio Amplifier Problem using BJTs

Below is my constructed audio amp and graphs that corresponds to the voltage at the collector of Q1 and the emitter of Q2. Everything works great until I add the capacitor to protect the speaker (8Ω)....
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2answers
237 views

Are there any advantages to an inverted serial prototocol?

Why would someone implement an inverted serial protocol? Are there advantages in doing so? One obvious disadvantage seems to be that an extra device needs to be included in a circuit if the ...
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44 views

Cable tray width selection as per NEC 392

I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
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2answers
70 views

Circuit using only NAND gates

I am starting to get beyond frustrated with gates and breadboards now in general because of this simple circuit (which is literally experiment #1 in my digital logic class). Using only NAND gates, ...
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19 views

PoE Magjack wiring with PEM1300 PD Module

I'm designing a poe based board using PEM1300 PD module and using the si-52003-f rj45 connector. I'm unsure in how i have to cable the PoE PD module to the RJ45 Jack, i mean, i want (if possible) to ...
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49 views

Connect DC/DC Conv Isolated Ground

I'm developing a modular equipment device aimed for industry, very similar to a PLC in terms of electronics. For all field interfaces I am using isolators and ESD protection for robustness and to pass ...
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2answers
123 views

POE Extraction and port reuse for POE Device

i need to get out from PoE cable 1A of power in order to drive some LCD Displays and leds, i've digged around and i've found some interesting POE extractor that can fit my requirements (like the ...
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1answer
50 views

Software for system architecture capture

I work as an electronics engineer and I'm starting to create a new device. This device will be significantly more complex than any project i've undertaken so far and will require close interaction ...
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2answers
62 views

How to go from specs/requirements to design, architecture, code, tests, documentation for embedded systems? [closed]

How do professional embedded systems engineers design, architect, code, test, document systems? Any good examples, libraries, resources that showcase the process of going from specs/requirements to ...
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32 views

Is the current rating of the buck converter must match the dc load current? [duplicate]

I am designing solar system for 1.2kw, 12vdc load and I want to insert a 48vdc to 12vdc converter between charge controller and load.what are the main things that I have to look at when I select this ...
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34 views

Input DCDC buck filter design equation

I am asking because I am confused. I cannot resolve this issue since yesterday and I am still learning. I was reading article about Input DC-DC buck filter. Each of the two articles say something ...
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1answer
44 views

CC1 and CC2 when connecting USB C to USB 3.0, is this pulldown network correct?

I have a USB C port on my computer and a USB C male-to-male cable, as well as USB C female and USB A 3.0 female breakout boards. I have connected my computer to the breakout via USB C cable and wired ...
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3answers
330 views

What is maximum and minimum current through zener diode?

For a simple electronic voltage regulator using Zener diode, I use the following circuit. For deciding Rs and RL, I need to know Izmax and Izmin of the zener diode 1N4736A used. From this data sheet, ...
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13 views

Measuring analog voltage from multiple differential input causes voltage fluctuation

As shown above i am using a micro controller's differential input to measure the analog voltage. When the the micro controller measures the voltage on the input pins there is a voltage fluctuation ...
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2answers
104 views

20MHz clock signal over several PCBs

I am running a 3.3V 20MHz clock signal for LED drivers over 10 PCBs that are connected to each other over short cables. Overall, the clock signal must travel 1m. Is this even possible with a 20MHz ...
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1answer
56 views

Can I design a photovoltaic system, or is that unrealistic?

I'm new to stack exchange, so ... feel free to ask for clarification, as many posters seem to be rather vague on their questions, from what I've seen. A little background: I'm a recent graduate in ...
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1answer
63 views

Will this LM317 Circuit work for my application?

I am attempting to design a circuit to charge lithium 18650 batteries is a 3S configuration. I understand that a BMS is recommended, but I am not concerned with that. I have built this LM317 circuit (...
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1answer
61 views

Questions regarding design problem

My instructor in electrical circuits has given me the following creative problem: Construct a communication chain, that follows the drawing below: The input is an AM signal, \$V_{send}=V_1\cdot cos(...
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77 views

Produce a clock out (5 MHz) with a counter and a clock in (50 MHz)

I'm trying to solve previous years' tests in logic design and there's this question that I can't really solve.. So, it gives me an 8-bit counter and a clock in (clk_in) of 50 MHz and it asks to ...
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40 views

Transformer operating frequency clarification

I'm trying to design a small audio transformer. Specs are as follows: ...
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68 views

Output filter (pi filter) EAGLE design

I am working on a project of wireless power transfer system for EVs. On the secondary side there is a full-wave rectifier which output current charges the battery. Of course, after the rectifier stage ...
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4answers
122 views

How do I translate product requirements into components, schematics, and programming?

I graduated with a degree in electrical engineering, but a) I've been doing mostly project management since, b) I didn't get my ADHD diagnosed until after I graduated, and c) I feel like inappropriate ...
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3answers
152 views

Equivalent circuit of a transformer

In equivalent circuit of a transformer, there are two inductances, \$L_p\$ and \$L_s\$. These are called Leakage inductances, as the name suggests due to the leakage flux from both the coils. 1) Are ...
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1answer
117 views

Two stage op-amp design with compensation ideas

I am trying to design an op-amp with a high-pass feedback. The diagram is shown below. The high pass feedback has a corner frequency at 1Hz. The op-amp itself is two stage as can be seen below. ...

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