Questions tagged [schematics]
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.
1,759 questions
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How to power and dim 3S10P LEDs from a USB-C using MT3608 and AL8860 for flicker-free operation?
I'm a electrical newbie. I’m working on a project where I need to power and dim a set of LEDs from a USB-C power bank (5 V, 3 A max). My LED configuration is 3 LEDs in series per string (3S) and 10 ...
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Why isn't schematic symbol controlling comment visibility?
I'm trying to update my libraries to have all the comments, etc., show when I'd like them to.
In the schematic symbol, I have chosen to 'Hide' the comment field for components like resistors, while ...
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Schematic Review of 14+14 watts TDA7269A Audio Amplifier
This a TDA7269 audio amp schematic which I made. It has two inputs for aux and BT and will run in single supply mode
Can someone please have a look and tell me if someting is wrong or missing which I ...
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Can I replace the big crystal oscillator with a smaller oscillator (in size) in MCP2515?
Am using the 'MCP2515 Can Bus Module Board with TJA1050' as a reference in my custom PCB, what I was wondering is that if I can replace the big crystal this board has (look at the image below)
I have ...
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What is the total capacitance on the VBUS line in this case?
I am working on a PCB that is supposed to be powered either by an USB Type-C or by a 3 cell LiPo battery, so in this scope I decided to use the TPS2121 power mux. The problem is I don't understand how ...
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Is this a good design for having 2 power inputs for a PCB?
I’m designing a PCB powered by a 3-cell LiPo battery. The battery provides +12V, which is stepped down to +5V using a buck converter. From there, the +5V is further stepped down to +3.3V using an LDO ...
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What do the dashed lines between the contacts mean? What does ON & OFF mean here?
Here I've shown 2 selector switch symbols almost having same symbol (but different purpose, I know that.) I have 2 questions.
What do ON (dashed lines)and OFF (solid lines) indicate?
Why there are ...
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What is the purpose of the relay and transistor in this circuit?
I want to build this fingerprint sensor lock system but I don't understand what is going on in the circuit. I understand the relay helps switch the solenoid but what does the transistor do?
The ...
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I don't know if my connections are correct. (Schematic to breadboard)
This is intended to be a voltage multiplier.
Can anyone check if my connections are correct or accurate to my schematic?
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BMS HY2120 automatic initialization
I'm using the HYCON HY2120 for a project and I've followed the recommended schematic :
I have just added a switch to connect/disconnect the PB+ and VDD of the cells. I have tried the overcharge and ...
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Integrating USB and TPS62933 Buck Converter for ESP32
I'm working on a schematic for an ESP32 project, using a 6V battery pack as the primary source and the TPS62933 buck converter to step down to 3.3V. I’d also like to add a USB-B Micro input (5V) to ...
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Is there a way to diagnose the this PSU fault with a multimeter only (schematic provided)?
Long story short, my subwoofer has stopped working and I've narrowed the problem down to a fault in the low-power standby circuitry - it should be giving me +7V and -7V, but currently the +7V is just ...
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Help with ArtNet Node Circuit Design using Teensy 4.1 and 4 DMX Outputs
I’m currently working on an ArtNet Node project using a Teensy 4.1 and aiming to build a 3 Universe ArtNet Node with Ethernet connectivity. The goal is to have four DMX outputs organized as follows:
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Custom ESP32-S3 PCB not connecting to PC
I am new to electronics and PCB design and am trying to make a little sensor hub thing based on the ESP32-S3 using the SeeedStudio XIAO Round Display via pin headers.
I have designed the following ...
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Sony CXD5605 Datasheet & Reference Schematic
I'm trying to find a proper datasheet with a reference schematic for the Sony CXD5605 or CXD5610 GNSS IC. They don't have anything published on their website.
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PCB Beginner Schematic Check [closed]
new to PCB design and wanted to learn by doing. I have linked a schematic to a project I am working on. This is a single piece of a larger project which will hopefully work nicely together but wanted ...
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Circuit Schematics for water level controller
I'm a beginner here. I am trying to build a water level controller. This is my multisim schematic. I am trying to use a switch that would play the part of water and the LED will turn on when the water ...
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Preset logic for Flip-Flop down counters. How can I preset the initial value until the count starts?
I'm trying to design a 59 second countdown on Quartus Prime, using a 4-bit JK stage for the second units and a 3-bit JK stage for the second tens. However, I've run into what I feel is a simple ...
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Problems with specific case of Blackman formula for calculating input impedance
I was reading a book about basic CMOS circuits ("Analog Design Essentials", W. Sansen) and I stumbled uppon this ciruit where input impedance \$z_{in}\$ is to be calculated.
I tried using ...
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Roast my schematic
Hobbyist here. As I'm self-taught and far from a daily designer, I'm curious about any input you might have regarding my newest creation:
My intention is to track the capacitance of whatever is ...
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Why is my V-out 0.7V?
I am a university student and I am new to using switching regulators. I am trying to design a USB-C PDboard with the TPS552882 TI PMIC chip.
I am getting a voltage output of 0.7V. While I was reading ...
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AM radio transmitter with max. 1m range - what schematic should I search/build?
For one of my project, I would need some low-power consumption AM transmitter module.
I'm very sure that I need amplitude-modulation broadcasting between the consumer AM radio bands (in Hungary : 530-...
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How to deal with opposite numbering of connectors
I use an FFC cable to connect a display to my board.
The connector on the display has its pinout well defined.
Also the connector on my PCB has clearly indicated which is pin 1.
Under ideal conditions ...
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Review PCB - Lamp and Motors - Round 2
This is a follow-up to this post.
I incorporated the feedback and decided to add a custom DC to DC converter (12V to 3V3). Also I designed the PCB from the schematic.
Traces are 0.3mm by deafult, ...
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Errors and Warnings from the Electrical rule checker in KiCad for my schematic project
For a project in my studies, I need to design a schematic for a PCB. I've already created the following schematic, which you can see in the attached image. However, I’m still getting one error and ...
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How do I show the power source switches from binding post to batteries on a schematic?
I'm making a circuit diagram for a friend, and she wants me to draw that the Gopros on her project switch from a DC power supply using binding posts (positive and negative terminals) to a 12V battery ...
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I created a schematic using OrCAD, but I'm unable to run the simulation.(Restricted license)
I was planning to test if the circuit would work normally when bringing in voltage from multiple sources and connecting them. This was just the first step, and I planned to add a flip-flop later, but ...
user426500
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What is the purpose of this circuit on the PIC16F18345 Evaluation Board?
I am trying to understand the schematic of MPLAB® XPRESS PIC16F18345 EVALUATION BOARD. However, I cannot understand the following parts.
What are the components connected to the RA4 pin of the MCU (...
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Issue with PCB Document Update in Altium Designer
In Altium Designer, when I perform an "Update PCB Document," I receive the following message:
"Failed to Match 1 of 277 components using Unique Identifiers. Do you want to try and match ...
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How to prevent loop in auto-switching charger using MH-CD42 and LTC4412?
I'm making UPS-like power supply using MH-CD42 lithium-ion Battery with 5V boost charging module and LTC4412 power or-ing IC chip.
I made my schematic based on the picture on google like the pictures ...
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Altium PCB error - Comma expected at line
I am getting this popup
every time I open the PCB file of my Altium project.
There is a similar question here Link: Altium Comma expected , and I tried the things suggested in the comments of it.
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PCB Design Review Request - Boost Converter Breakout Board
I recently decided I wanted to design a breakout board for the MIC2253-06YML-TR (datasheet), though an evaluation board exists for it I will need this chip for an ongoing project I will be working on ...
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Circuit that turns two LEDs off/on depending on switch
I have been trying to solve this for the last couple of days and no matter what I do, green LED always receives some current.
What I would like to happen is when the switch is closed, turn on just the ...
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Component verification about circuit breaker
I'm reading a circuit diagram, source http://bit.ly/1FAVXSw from P83 of book MASTERING STM32 SECOND EDITION Version 2.0.1 written by Carmine Noviello, a component is SB? like below:
I look it at BOM ...
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Using 3.3 V on a STM32F407-DISCO board instead of 3 V
In the design file of the board (MB997) I can see that the STM32F407 — DISCO board is fitted with a Schottky diode (D3) on its LDO output which has a voltage drop of ~0.3 V. That is why it works on a ...
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TMP102 schematic
I am trying to make a custom thermometer pcb and I want to use an atmega328 and a TMP102 thermometer. I am an absolute noob and I was wondering if I have to copy all of those components seen in the ...
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micro usb is not giving 5v but instead vbus is giving 0.45v
I just got my first 4 layer newly assembled board from PCBway.
When USB cable is connected, the board is not powering on.
When I checked the vbus it's showing 0.45v. After this I checked the MOSFET q1 ...
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How do I make my circuit diagram look better? Or is it wrong?
This is my first time making a circuit diagram with this many components. Any advice on how I can make it more organized or look better? The wiring looks wire to me but I'm not sure if it looks wrong.
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Which Arduino pin is giving gnd to the bus rail on a PCB?
I'm using a protoshield v2 for my Arduino Uno R3 project and I'm a little confused on how the bus rails works.
So I understand that the 5V pin from the Arduino is giving 5V to the 5V bus rail on the ...
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How to tell which pin is which on this toggle switch?
I'm working with 5646AB for my project. Can someone help me clarify which pin is which? I don't want to assume the top left one is 3 XD.
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Not confident about going for PCB production [closed]
I have come up with my own PCB and I now want to go for production. Though I will order very few boards in the first order, it costs me decent amount of money to get a fully assembled PCB. This PCB is ...
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Is this a good schematic for the W25Q128JVSIM flash memory?
I'm designing a PCB and need additional flash memory for the firmware, so I've chosen the W25Q128JVSIM flash memory(datasheet) and plan to use standard SPI. I've connected both the IO2 (/WP) and IO3 (/...
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Do you see anything wrong with my power circuit?
As the battery input I am using a Turnigy Nano-Tech 2200mAh 3S 25C Lipo Pack w/XT60 that fully charged is able to provide 12.6V. The ferrite bead FB1(2744555576 from fair-rite) is supposed to act as a ...
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Where is the Cf cap in this design?
I am using WEBENCH from TI for the LM2596SX-5.0/NOPB buck converter. It is a Cf cap in the "BILL OF MATERIALS" that doesn't appear on the schematic. Do you know where is that from?
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32 MHz xtal on ST MB1874_HP reference schematic questions
I'm designing a PCB heavily based on ST's STDES-WL5U2IHH reference design with the MB1874_HP schematic (extract below). It utilizes a type of crystal I've never used before (NX2016SA 32 MHz EXS00A-...
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Do you see anything wrong with the power section in my schematic?
I am new to electrical engineering and I would be very grateful if someone could look over my schematic and tell me if something is wrong or could be done better. In my schematic I have a XT60-M ...
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Adding more pins to a symbol in Altium Designer
I've made a custom symbol in altium designer, and I want to add more pins to it. I have already saved it and created it, and when I try edit it I can't seem to find any option to edit the amount of ...
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UART buffer using N-mosfet? [duplicate]
In this circuit, I expect that the designer needs a buffer stage for its UART (same ckt for tx and rx, but how should this work?
Thank you..
Edit: This is not a level shifter, UART is all the way (...
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What is this schematic symbol (a dark line and an empty circle) in a small power supply?
This is a power supply to a small audio amplifier in John Lenk's book Handbook of Simplified Solid-State Circuit Design (p. 82). It appears highlighted below in parallel with the transformer and fuse,...
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Help review my schematic for a LiPo + USB power supply and charger
I've recently redesigned this schematic based on the feedback I've received on an earlier post.
Questions:
Will power source switching MOSFETs work in the configuration I'm using?
Will the tri-state ...
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