Electrical Engineering

Questions tagged [schematics]

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The diagram that shows how the parts are hooked up logically. If your question is about a specific schematic software package, use that tag instead.

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59 views

Battery Capacity Tester - Schematic Review

I designed a circuit to test Lithium battery (3.7v) capacity. My measurements do not need to precise but should be relatively accurate between each batteries so think this should do. Schematics: Using ...
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1answer
33 views

Schematic of an amplifier with bandpass filter and impedance matching

I am having trouble creating a block diagram in PADS Professional Designer. My HMC414 amplifier (documentation: https://www.analog.com/media/en/technical-documentation/data-sheets/hmc414.pdf ) has IN ...
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37 views

Wire routing - tips and hints? [closed]

I would like to use something similar to the below pictures in order to present the wire routing of a project in a simple and understandable way. Does anyone have any suggestions on programs I could ...
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1answer
69 views

Is there any more subtle convention for GPIO pin labelling between overlines, asterisks, and/or inverter symbols?

As a firmware developer, I've been given an old schematic that seems to have an inconsistency between pin naming conventions. Some of the signal lines from the microcontroller are labeled with an ...
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1answer
61 views

How to choose between PCIE and USB3 in a CPU pin?

While looking at Validation Reference Platform for 11th Gen Intel CPU (Tiger Lake UP3), I noticed that some pins for the MCP (Multi Chip Package, which is a package that includes PCH+CPU on the same ...
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1answer
71 views

Parallel wires needing to cross - best practices in a schematic? [closed]

I'm sure we've all run in to the following situation: Here, I need to connect pin 1 and 2 on the left to pin 1 and 2 on the right, and vice versa with pin 2. I've considered a few options, however ...
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46 views

Standard for electrical schematics in the UK

I'm trying to find out whether there is an accepted standard for electrical schematics in the UK. From my research so far, I've come across IEC 60617 however this appears to have been withdrawn. I ...
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42 views

4-20mA to voltage breakout: part identification

I am trying to recreate the SEN0262 current to voltage circuit and embed it into my own board. As you can see, the schematics looks pretty good, but I'm unable to identify the D1, D2, and D3 diodes. ...
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51 views

Understanding a power switch circuit that includes Schottky diodes at its input

In the following design, I couldn't find the datasheet for the part U25. All I could find from Orcad that chip part name is: G5027C. Anyway, I don't have contact with the person who created this ...
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62 views

How to interface a RPi Pico to DMX / RDM

Years ago, I was looking at creating a stage DMX controller using AVR. Time moved on and the Raspberry Pi Pico has now been released. I'd like to revisit the project using a Raspberry Pi Pico, which ...
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77 views

How to interpret this layout?

I'm wrapping my head around this layout, I'm trying to extract its schematics so I can determine the logic function. For what I understand we have two PMOS and two NMOS transistor. I see one ...
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2answers
60 views

Is there a way to import a PCB layout from one “sheet” into a multisheet in KiCad?

I am making a multisheet schematic and I'm appending schematics from other projects into the multisheet. They take their netlist along with them which is great but, is there a way to take their PCB ...
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1answer
126 views

Can someone help me identify this circuit symbol please?

I'm trying to fix something and there is a component on the schematic that I don't recognize. Is this symbol supposed to represent a jumper?
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1answer
22 views

Transistor simulation not working properly in Proteus

I'm recently working with Proteus. So I created a simple schematic for a transistor to work as a switch. But when I simulate it, it doesn't work as it should. In the picture below you can see that the ...
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39 views

Implementing IMU, help with neccessary components?

I am looking at making a schematic for the ISM330DHCX alongside a ATmega328P processor for Arduino. I have the Adafruit version of it (LSM6DSOX is same footprint). Schematic: PCB: I just wanted to ...
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How to ensure that the output of an inverter is High while it's input is High-Z

This design is part of a board that Converts PCIE to USB using a Host Controller. the host controller has an SPI ROM that I want to be able to flash in in two ways. one way using the Host Controller ...
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47 views

KiCAD: Potential error in designing schematic symbol

I received a part of a schematic. It is this one: When i received my parts, i saw that the pinout was reversed. 1-8 was on the left side, while 9-16 was on the right side. At that time, i didn't know ...
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1answer
59 views

Band-pass op-amp structure with parallel diodes in feedback?

It's been a while since I've done analog circuit theory, and I'm trying to interpret the 2nd gain stage sub-circuit in this schematic for a guitar pedal: I'm not sure if I'm approaching the circuit ...
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1answer
43 views

Flashing SPI flash using DediProg while having intersection with other device

In my design for PCIE to USB converter board. I use VL805 Host Controller to do the conversion. the chip needs a firmware that I flash it to SPI FLASH (U25) using DediProg. I added a special 6-pin ...
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46 views

Mini-UPS schematic - load-sharing of battery pack and power source

I am a beginner working on a mini-UPS project for a low-power server (computer). I've made the following schematic where I'm trying to achieve the following: Charge 3S 18650 battery pack BMS with 12....
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61 views

Confusing PNP transistor configuration on PCB, trying to understand how it is wired

I was hoping someone could help me decipher this Q4 PNP transistor. It is labeled Y2 on top of it but it didn't come out in the image. Looking around on google I see that it is a PNP transistor and ...
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4answers
91 views

Diagnosing water heater error - Need help with diagram

I'm diagnosing an error in a water heater. The error code indicates that the error is related to the connectors X2. Between both connectors X2 there is this Symbol "/" with the number 5. I ...
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38 views

MicroUSB to MCU interface with logical level conversion

I'm trying to interface a micro USB port to a microcontroller but I'm not sure about something. The micro USB port will be connected to a computer with a simple USB cable and that will give me a 5V ...
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1answer
38 views

KiCAD: Adding a label to schematic produces error in Pcbnew

I had a schematic, then I went to do layout work in Pcbnew. I layed out the parts and then proceeded to draw the easy traces, the low hanging fruit. This is the PCB at this point: I had created a GND ...
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13 views

Working with Mentor Graphics xPCB Planner\xPCB Layout and OrCAD

I'm working with Mentor Graphics xPCB Planner (very similar to xPCB Layout) for placement and OrCAD Capture CIS 16.5 for schematic design. I'm interested in working with both tools in parallel, where ...
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1answer
75 views

Having trouble with an aviation-band receiver

I finished assembling an aviation band receiver that I bought online. I thought it would be good project for my resume, as I am an electrical engineer major at a University in California. I read the ...
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2answers
44 views

What's the best way to dim a 5-inch LCD for a Raspberry Pi?

I'm trying to make a DPI display to work with my Raspberry Pi. First, I searched around and found out that the 555 timer IC is a good way to control the brightness of the display. Since the background ...
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1answer
76 views

Rectifier unit in Neve 33609 Compressor Schematic

Real quick question, I'm analyzing the Neve 33609 schematic (as shown below), and I can't figure out what is responsible for rectifying the AC audio signal into a DC control voltage. If anyone has an ...
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2answers
57 views

SN65HVD232: Will it work if VCC = 5V?

Datasheet - SN65HVD232 Full part no - SN65HVD232D My schematic - Hi all, there is a problem in my PCB where 5V track is connected to VCC pin instead of 3.3V. Actual input should be 3.3V as per ...
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4answers
44 views

Creating multiple identical outputs for a device and shorting between them

While looking at existing designs in the company that I recently started working at, I noticed many times that designers take for Example a DC-DC and add extra outputs that have the same name, and ...
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1answer
115 views

Verify schematic and board to get it ready for commercial release [closed]

Is there a paid service or platform to hire an electronic engineer to verify a schematic and pcb board I created to get it ready for commercial release? It's the first schematic I ever created. I ...
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1answer
50 views

RS485 isolated circuit - forgot connections. Will this work?

below is my schematic for isolated RS485 section. FYI B0305XT-1WR2 is used for power isolation and ISO1500DBQ as transceiver. As you can see I forgot to place GND & GND_RS485 connections at pins 2 ...
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35 views

Help on Schematic for ATMEGA64 and FT232RL

I am relatively new to electronics and was trying to make a PCB with Atmega64 and FT232RL, similar to an Arduino. Pictures of my schematic are attached below. The wires in the top right of the FT232RL ...
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39 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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38 views

EAGLE Schematic Design Best Practices

I am currently learning how to use EAGLE. My end-goal is to have a simple PCB printed in China for a project that I am working on. Since I don't have experience in designing schematics, what would be ...
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2answers
64 views

Arduino Uno Schematic Parts

I am trying to determine what two parts of the Arduino schematic are (I am quite new to reading schematics). I have circled the areas of confusion. Please let me know what these components do and ...
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1answer
110 views

Driving throttle sensor output to “play” on motorcycle

I'm trying to create device that allows to play music with motorcycle engines - something like that. I need help with electronic circuit to make that work. Bikes which I would like to use have fly by ...
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0answers
50 views

RF Collection PCB Schematic

I usually work with breadboards, but I wanted to use the P2110B from Powercast, and since I couldn't find any breakout boards for it and desperately needed some experience with schematics and PCBs, I ...
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3answers
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Hearing only noise and ticking sound with simple AM radio - The art of electronics

I've tried to build the simple AM radio that is proposed at page 56-The Art of Electronics (3rd). The idea is to tune my radio on a frequency of 657 kHz (I'm sure there's a station at that frequency)....
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0answers
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Schematic Capture: Proteus ISIS Bulk Component Editing

Is there any way in Proteus 8 Professional ISIS schematic capture to bulk edit components? I have a sheet full of 0805 decoupling capacitors which I would like to make 0402. I tried all of the ...
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2answers
42 views

Altium 365 - changing the default comment

Recently, our company decided to move to Altium 365 since we are starting a big project where multiple people will be working on a single project. We have a local library that is up to date and used ...
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1answer
55 views

Need proofing on this 12v battery protection circuit

I am making a battery protection board for my 12v battery. The amperage pulled from the battery could go up to as much as 20A. I want the Arduino (connected to the protection board) to activate the ...
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61 views

Need help with reading schematics for the PC Engine console

Problem: console works with power supply, but doesn't turn on with external power to exp. port on the back (has two pins for Vin) Could not find the proper pc engine manual, but tg16 should be similar....
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77 views

How to correctly interpret relay schematics

I am copying a schematic in EAGLE to make a battery protection board (https://www.homemade-circuits.com/battery-over-discharge-protection/) I am very unexperienced in writing relays in schematics, and ...
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102 views

What is this schematic symbol with two arrows?

I'm trying to figure out what this schematic symbol is. At first, I thought it was some kind of diode but I don't know if that makes sense. The symbol is highlighted in yellow below:
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Need a review on my first schematic. A 3-speed mode blowers schematics

I am currently on my own project building a blower that can be controlled using a switch with 2-3 speed mode powered by 12V Li-Ion Battery with hope this can support local health workers. However, I ...
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2answers
77 views

What does “preserving the logic expression” mean?

I already asked a similar question here but didn't get an answer that explained the reasoning. Now the question is I'm asked to find which of the circuits below preserves the logic expression, but I ...
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0answers
55 views

Reverse polarity protection with a MOSFET, am I doing it right?

I'm creating a simple LiPo charger and I would like to add a reverse polarity function to the module. The source voltage is 4.2V, the maximum current draw is 2A. Is this schematic correct? The MOSFET ...
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1answer
61 views

Creating a schematic symbol in LTSpice

I use LTSpice XVII in macOS. I want to create a symbol from a schematic so that I can instantiate that symbol wherever I want. I tried this tutorial but I can't get it working. Any help? Thanks in ...
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1answer
56 views

Seeking deeper understand of reading a schematic with an op-amp IC (AD-8574)

A couple days ago I was seeking some education on reading a schematic, I had great answers for replies and I feel like I am closer. What I am trying to get my head around is the use of a dual channel ...

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