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Please explain the purpose of R3 and R4 in this ground isolating amplifier

This schematic can be found here on page 15: Here's what I do understand (I think): The ground noise is common mode voltage, and the amplifier has high CMRR, so it gets rid of the ground noise at G2 ...
charles's user avatar
  • 51
2 votes
1 answer
199 views

Contains floating input pins

I have a error in my schematic "Contains floating input pins": This error cause an issue apparently, the issue is that, When I update the Schematic to see the footprints in the PCB, the ...
Andromeda's user avatar
  • 473
0 votes
2 answers
92 views

Incorporating stomp switch into fuzz pedal

My friend asked me to design a fuzz pedal for him, so I based my design on this project: https://www.electrosmash.com/germanium-fuzz Their schematic is as follows: What I am confused about is their ...
dreece2498's user avatar
0 votes
3 answers
63 views

How does this input buffer work in schematic from Xilinx Virtex-5 user guide?

The following is from page 302 of the Xilinx VIrtex-5 User guide: https://docs.amd.com/v/u/en-US/ug190 It seems to me like the incoming signal should go into the input buffer and then the output ...
charles's user avatar
  • 51
0 votes
1 answer
67 views

Is there anything wrong with doing a buck then boost converter instead of a buck boost

I was trying to find a buck-boost converter that can do 5A with a voltage input range of 12 and a output range of 5-20 for usb pd. I found that if I did a buck then boost converter the price for both ...
Chris Walker's user avatar
4 votes
3 answers
223 views

Unused inputs and out puts on 74 series ttl logic chips

Hi I am using a 74ls38 quad 2 input nand buffer with open collector outputs and as well as a 74ls74 Dual Positive-Edge-Triggered D Flip-Flops with Preset, Clear and Complementary Outputs. On the nand ...
Curggles's user avatar
7 votes
3 answers
259 views

ESD knocking out PHY on device with unisolated POE

I inherited this design, one problem I am having is ESD on the chassis knocks out the PHY, sometimes it can't even be reset via software. I am curious if anyone can spot any glaring errors with the ...
Voltage Spike's user avatar
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1 vote
1 answer
74 views

TP4056 with protection: schematic review

I'm working on an MP3 player PCB based on an ESP32. I would like it to run on a battery. I have looked for a TP4056 with protection schematics on OSHWLab. This is my schematic: Do I need the blue ...
ewaca's user avatar
  • 11
0 votes
0 answers
103 views

Review of PCB Schematic

Working on a small hobby project of a power socket whereby to allow the switch to be turned on / off both manually but also remotely via a ESP32C3. I achieve this by converting the mains AC 100-240V ...
Dragonfly3r's user avatar
0 votes
1 answer
160 views

Which pins are used for I2C and SPI in ESP32-S3?

I am using ESP32-S3-WROOM-1-N16R2 Controller in my design. I want to connect Sensor with this module which has both I2C and SPI Communication pins. I gone through the datasheet for controller, but i ...
Kuralmozhi's user avatar
0 votes
2 answers
94 views

How do I mark pads on the PCB footprint as not used in KiCad?

I'm using KiCad to design a PCB. I'm using Raspberry Pi Pico, which has a number of GND pins (for designer's convenience). The symbol/footprint I have (downloaded somewhere from the Internet) have ...
Spook's user avatar
  • 199
0 votes
3 answers
79 views

How does one connect a DPDT Push switch?

I am using a MHPS2273 DPDT push button in my design. The purpose of this switch is to turn ON the device when I press the button. If I again press the button it will turn OFF the device. I am confused ...
Kuralmozhi's user avatar
0 votes
0 answers
24 views

Altium - Lock bordering rectangle in schemtic

I like to place a border rectangle around sub-sections of a circuit on a single sheet to clearly show each separate function of the circuit. Problem is if I try to move something within that border I ...
user120300's user avatar
0 votes
0 answers
51 views

ESP32 Power Switch Schematic Review

I'm designing a WIFI power switch using a simple circuit of an ESP32 and MOSFET. Battery will plug into IN terminal and the board that is being powered on/off will be plugged into the OUT terminal. ...
Fireflash's user avatar
0 votes
0 answers
59 views

Welding machine schematic: PWM controller connections

I don't understand why the VFB pin of the UC3845AD PWM controller is grounded, and why the compensator pin is connected to the output of the LM224 through VD1 and VD2.
professor's user avatar
1 vote
2 answers
300 views

"JieLi Tech AC6329C4" design

I'm trying to design a basic "very cheap" bluetooth solution, that can connect to my phone and turn on a light emitting diode via a signal. The cheapest BLE IC I could find was this one on ...
Mustansir Godhrawala's user avatar
0 votes
0 answers
40 views

PCB usb powered - led and screen wiring + review schematic

I'm currently designing a PCB featuring an STM32F103CBT6 MCU. The PCB will host five different groups of WS2812B LEDs, multiplexed 22 pushbuttons, 4 rotary encoders, and additionally, a VoCore 5" ...
Djowwie's user avatar
  • 11
0 votes
1 answer
57 views

Problem with CHQ1838 schematic

Hello, I have problem with this schematic, the Arduino did not receive any signal. What is wrong with it? I have this schematic provided by producer
Mateusz Bielak's user avatar
0 votes
1 answer
71 views

Errors in Schematic made in Altium Designer

I am using Altium Designer as ECAD tool for first time to create the schematics. There are few errors which are popping up and I don't know how to get rid of those errors. First one is regarding HI ...
Alison's user avatar
  • 347
4 votes
1 answer
2k views

I'm trying to create a clock. Rate my first schematic design

Hey guys, I'm a developer trying to learn PCB design and advanced hardware design and needed a place to start. I've designed a very basic clock with a Atmel Atmega328P-AU and from checking out some ...
Mustansir Godhrawala's user avatar
0 votes
0 answers
50 views

Schematic for auto phase selector

Can someone check the response of the schematic of auto phase selector switch, wherein MCU will read all the AC inputs of 3 phases accurately and make perfect decision for the healthy phase for the ...
Atish's user avatar
  • 1
2 votes
5 answers
190 views

Ethernet PHY and their corresponding hardware are represented Right to Left in most datasheets and application notes schematic. Why?

What's the matter? If you are here for complicated applied physics, you'll be quite disappointed. This post is just about a bit of electronic world trivia. I am currently designing a board with two ...
Tioneb's user avatar
  • 173
2 votes
1 answer
78 views

How to simulate a 30 inch FR-4 lossy channel (20dB loss) using ltline symbol in LtSpice?

For designing a high speed serdes system, I need to model a lossy channel of FR-4 substrate of length as 30 inch and 20dB attenuation. How can I implement it in LtSpice tool?
MEGOPI's user avatar
  • 23
0 votes
0 answers
33 views

Export Cadence Virtuoso Schematic to tikz

To export the layout to tikz, there's this great tool available: https://github.com/electronics-and-drives/ml2tikz I thought there was a similar tool to export the schematic to tikz but I can't find ...
Holzbaum's user avatar
0 votes
0 answers
66 views

Altium: Exported schematic page size cuts off part of schematic

When I export the schematic, both through Smart PDF Wizard and through the output job files, the schematics are cut off in the bottom and right side. This hasn't happened before but I just got a new ...
SpaceGuyGabe's user avatar
9 votes
7 answers
4k views

Why is there sometimes a resistor just before ground?

In the circuit below, why there is a resistor R2? What would be the difference if it wasn't there? simulate this circuit – Schematic created using CircuitLab I am not in school. This is not ...
johnny's user avatar
  • 433
0 votes
0 answers
36 views

Synchronous rectifier driving with transformers

Based on Half-Bridge DC-to-DC Converter With Primary-Side Control User's Guide, TI uses the following schematic for driving the synchronous rectifiers on the secondary: They use a gate drive ...
PosFLo's user avatar
  • 11
0 votes
2 answers
61 views

Bias start up circuit for half bridge converter

In this schematic (below) from the Texas Instruments UCC28250EVM-564 User's Guide (Controller for Half-Bridge DC-to-DC Converter With Secondary-Side Control), they use a bias winding. I understand ...
PosFLo's user avatar
  • 11
0 votes
1 answer
50 views

Trouble understanding datasheet of LR645

I don't understand this schematic. Is the ground on the secondary of the transformer the same as the one on the primary? If so, what is the point doing it, since the isolation would be lost? How ...
PosFLo's user avatar
  • 11
1 vote
1 answer
180 views

Circuit diagram potential issue and help regarding debugging

I'm an EE student in my first year, and for my LCA project, we had to buy components and attach all the components of any circuit from the internet. I found one and I've verified my connections many ...
redline125's user avatar
0 votes
2 answers
41 views

PADS for land pattern coilcraft

How can you even make a footprint/ land pattern with this info. Is that land pattern the pads? Is that a wire going into the model, meaning my pad just needs to touch either side of the component? ...
Wes Ellgass's user avatar
1 vote
1 answer
226 views

Floating input pin error on my rover schematic of altium designer

I am receiving "contains floating input pins" errors on my altium designer schematic (among other issues) despite the wires being correctly connected, and each port and respective component ...
YouGotDecked's user avatar
0 votes
0 answers
49 views

Making sense of new vs old wiring schematic

I'm hooking up a new AC condenser fan and attached is the pic of the old and new diagrams. Where should the new wires should go in reference to the old ones? They are run to a single 4 pin plug.
GRB's user avatar
  • 1
0 votes
1 answer
161 views

How to change the order of parameters on a component in schematic

In my symbol library for my capacitor, the capacitance displays before the voltage rating. When I place it on a schematic, the voltage displays first. I want the capacitance to display first. How can ...
Rymazon's user avatar
1 vote
3 answers
70 views

Review and Feedback on my Prototype Button Module for Breadboard [closed]

I'm working on creating a button module that can be placed on a breadboard. I've designed the schematic for it and am considering converting it into a PCB soon. You can find the images of the module ...
megvrx's user avatar
  • 19
1 vote
2 answers
201 views

Full Bridge Rectifier Schematic Analysis

I am working on a circuit of an old 90's Terminal Applicator and noticed it has AC power coming in, then stepped down with a transformer, and then going to a pair of full bridge rectifiers. One goes ...
Erik Vincent's user avatar
3 votes
4 answers
536 views

How do you show in a diagram of a (DIN) connector that you are looking from the front or from the back?

Exploring the many wiring diagrams of DIN connectors on the internet (an example shown in the image below), I note that the more detailed authors always emphasize whether one is looking at these ...
Ivo Filot's user avatar
  • 133
1 vote
3 answers
81 views

Low side P-FET usage is opposite of expected, what did I do wrong?

I'm working on a circuit that should close a reed relay (normally open) when TI/COUT is low and open said relay when TI/COUT is high (6V). I'm using a P-FET low side transistor to ground the relay &...
Sveinung Kval Bakken's user avatar
0 votes
1 answer
30 views

L293D motor driver resistor network confusion

I've been trying to modify the original Adafruit V1 L293D motor driver, but have run into a bit of a roadblock when reading its schematic. The text labelling the resistor network has stacked and ...
poxyping's user avatar
1 vote
1 answer
60 views

How do Altium Designer 20.2.4 Schematic Defaults work?

I'm trying to use the Schematic -> Defaults to predefine how I want every part of my schematic, but I found it a bit confusing. First of all, I can't make the changes that I want. Now I'm trying to ...
santiago deliotte's user avatar
1 vote
0 answers
121 views

Schematic Review Request: Controller Circuit

I am a ME, not an EE, so bear with my ignorance please. My schematic probably will make that clear, ha. I am designing a circuit which interfaces a 12V vehicle system with GPIO on two ...
El Chavo's user avatar
2 votes
3 answers
137 views

How to read this schematic correctly

This schematic will be used to wire a potentiometer and momentary on switch to a welder. The schematic states that there is a cable shield grounded to the connector. Am I correct to assume that this ...
Richtdow's user avatar
0 votes
0 answers
51 views

How to change standard schematic for ambient light sensor TSL25911FN

I am implementing ambient light sensor TSL25911FN into my design schema. [A] VCC = +3.3V, SDA_SC and SCL_SC use standar +3.3V logic. Here is standard implementation of such sensor by producers like ...
Marian Minar's user avatar
12 votes
4 answers
3k views

Why is there a polarized capacitor symbol in an AC circuit?

I am confused. My question is very basic, someone please enlighten me. If polarized capacitors should not be used in reverse polarity then why does every textbook (like the one I am using, Grob's ...
Asim's user avatar
  • 286
0 votes
0 answers
75 views

TMC5160 the outputs signals do not work correctly

I have a Problem with TMC5160. I use the spi communication and I have measured the signal, they are correctly. But on Output of TMC5160 I have a problem. My MOS-FETS do not work correct. I measure on ...
Tartarus MuRFy's user avatar
2 votes
3 answers
293 views

Pin Conflict during ERC in KiCad

During ERC, I get these two warnings: If you take a look at the schematic, these are the problematic areas: No matter how many Power Flags I place, I cannot seem ...
user1584421's user avatar
  • 1,369
1 vote
1 answer
145 views

First time schematic for USB-C power detection

Hey all I am creating a PCB that allows me to detect when I plug in a tablet, laptop, etc. to my home made tablet organizer. It's difficult to see if it made a connection in the back since you place ...
StealthRT's user avatar
  • 783
4 votes
3 answers
957 views

I need suggestions/feedback on my simple active balancer schematics for two 12V batteries in series

Since I currently use a 24V battery system for my house using 16 12V car batteries (2 parallel banks of 8 in series with each other) and use the lower 12V side for additional devices, (as well as due ...
Edin Fifić's user avatar
  • 5,481
1 vote
0 answers
169 views

Ammeter showing wrong value

I am trying to figure out why the multimeter is not displaying the right current. I purchased a bayite DC 6.5-100V 0-100A LCD display digital current voltage power energy meter multimeter ammeter ...
Sid C's user avatar
  • 11
1 vote
3 answers
150 views

Looking for a block diagram from this schematic

I'm looking for the block diagram from this schematic. My concern is the multi-feedback. I don't really know how I could model it. simulate this circuit – Schematic created using CircuitLab
exolune's user avatar
  • 59