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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.

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Embedded software extraction [closed]

1: I have a soldering iron and hot air controller board. It comes from an SMD soldering rework station by the same name. Mine is unbranded, but I have seen about half a dozen sellers selling the same ...
HAL 9000's user avatar
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1 answer
93 views

LSM303AGR burnt, help find the schematic error

I am just testing the board, it was working fine but after some 3-4 hours, I noticed the 3V3 had shorted to GND, I was measuring 0.5V on the power source. I inspected with a thermal camera and the ...
Tomás Arturo Herrera Castro's user avatar
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93 views

Review a simple schematics

Hello everyone I hope you are well! I finished my schematics and need a quick review (I would be grateful for the insights). The board has the following: ATTiny 1616 as the MCU (https://ww1.microchip....
Tahoor Asim's user avatar
2 votes
1 answer
77 views

Understanding symbol of a latching push switch

I want to understand the schematic symbol for the illuminated, latching push switch I am using. My objective is to use it simply for ON and OFF purposes. Link for the part and datasheet. Symbol from ...
Tahoor Asim's user avatar
1 vote
2 answers
48 views

Electrical types in KiCAD pins in custom symbol creation

I'm trying to make a symbol for this IC(DAC60501MDGSR) with the following pinout: But in KiCAD for each pin I need to assign an "electrical type" from the dropdown menu: Here below what I ...
cm64's user avatar
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2 votes
1 answer
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FT230X using USB-C receptacle not working for data transfer

I have tried to add a USB-C connection to my PCBA solely for data transfer. I have used a FT230XQ-R microchip (Datasheet) and followed their uploaded example for a USB-C receptacle. I have now ...
Prolik_'s user avatar
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Help needed for verifying 3.3 V wireless charging schematic with LIR927 battery

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. I am working on a wireless charging ...
Sean O'Sullivan's user avatar
1 vote
3 answers
88 views

Updating a Schematic with Annotation

What's the protocol for updating a schematic? I have 4 diodes creating a bridge rectifier on an existing schematic that I was going to replace with a single part. For example, if those diodes were ...
BoomSoon's user avatar
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2 answers
83 views

Using a three terminal PCB slide switch for on/off control

Most of on/off PCB slide stiches has 3 pins(terminals). And I want to use this such switch as on/off switch for the following part of a circuit: Above SW1 is the 3-terminal slide switch I want to use ...
user1245's user avatar
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2 answers
119 views

How would I convert this to a perforated circuit board? [closed]

How would I go about converting this schematic to perforated circuit board? For example, how would I connect the battery to the op amp?
Kyle Taormina's user avatar
1 vote
0 answers
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Needed Assistance - EMI Issues with 16x2 LCD Display (Model BCB-1602-03C)

Hello stack Exchange Community, I am Yogesh D from Trident Pneumatics Private Limited, R&D Innovation - Electronics. We are currently using a 16x2 LCD display (model BCB-1602-03C) in the ...
Jishnu Prakash Nambiar's user avatar
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3 answers
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Trying to understand this wah pedal schematic

I want to build a Wah pedal following the tutorial linked. I am confused on why there are two voltage sources and why the one on the left does not connect back to the main circuit. The materials list ...
Kyle Taormina's user avatar
1 vote
3 answers
80 views

Resistor after voltage divider changing the maths?

I would like to get the correct voltage value after a voltage divider. In some way R7 is affecting the estimated voltage output value but I don't know how. My math, (Vout) calculated after R7: Vout = (...
johnnytolengo's user avatar
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1 answer
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How to best use Micro-Cap?

Several users of this site recommended I switch to Micro-Cap for simulation. I'm having trouble with their schematic capture: First, the symbols are very small compared to the text. Is there a way ...
SRobertJames's user avatar
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Outdoor LED power PCB schematic review

Could someone look over my schematic and let me know if I need to change anything or if everything looks good? This PCB will be used outside (inside a waterproof cover) and will power a few LED strips ...
StealthRT's user avatar
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What is the purpose of the long line with parallel notches, that spans the whole length of some electrical diagrams?

What is the purpose of the long line with parallel notches, that spans the whole length of some electrical diagrams?
Branathon2's user avatar
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Switch Protection

I am using SPDT and multiplexer switches in my design and these switches are directly connected to Px connectors for various channels. Transducers (capacitive load below 500 Ω) are connected at Pin 2 ...
user135156's user avatar
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Second Opinion on Superheterodyne Receiver Design

I've design a superheterodyne receiver for frequencies between 88-108MHz. Below shows the final schematic and I wanted to get a second opinion on it. Specifically, I wanted to know if the general ...
TheButterMineCutter's user avatar
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1 answer
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The pin configuration of an RJ45 network connector Pulse J0G-0001NL

I have a few questions about whether I have pulled the right one for this RJ45 connector. It's a Pulse J0G-0001NL and the pin configuration is below. But note that if you look at the pattern, you ...
euraad's user avatar
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-1 votes
1 answer
45 views

What is the recommended reference for modules on the schematics?

In my schematics I often use external modules like NFC readers, USB/TTL converters, MP3 players, and so on. They are physically connected to the PCB with a connector (for example a standard 2,54 mm ...
Mark's user avatar
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1 answer
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Is there a way to say on Altium Designer schematic that a component's pin is not connected?

Is there a way to say on Altium Designer schematic that a component's pin is not connected?
alvaro562003's user avatar
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1 answer
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How to select resistors for MOSFET Gate terminal?

I need to design Buzzer circuit. While i searching for reference design in google i saw one design based on buzzer, Here they drive a buzzer by using MOSFET. Here My doubt is, they used R23 & R24 ...
Kuralmozhi's user avatar
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0 answers
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Schematic review of lipo charger

please review my schematic for battery charging
Poupiloup Polpy's user avatar
1 vote
1 answer
60 views

How can I protect a DC/DC converter when VIN is floating?

I'm using a L6902 (https://www.st.com/resource/en/datasheet/l6902.pdf) to charge a 4 cell lifepo4 pack (with a solid BMS). Do I need a diode on the converter output (PACK+) to prevent the converter ...
alexlroemer's user avatar
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33 views

The simulation in DipTrace 5

I have created a schematic, see attached screenshot. Now I am trying to simulate how it works in digital Spice simulator (built in DipTrace 5.0 beta). digital Spice simulator (built in DipTrace 5.0 ...
Kirchhoff's user avatar
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2 answers
40 views

Rotary encoder filter schematic unclear

I have a PEC11R-4215F-S0024 rotary encoder and want to build a filter circuit but I do not understand which parts of the schematic are connected to their respective pins. Additionally I only see 4 ...
Sandvall's user avatar
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43 views

CCFL(Cold-cathode fluorescent lamps) Power Source

I'm trying to understand how the inverter of a CCFL works. The CCFL was used as the backlight of an old Samsung TV. It seems that the inverter output(secondary winding of the transformer) is a high ...
Omar Rodriguez's user avatar
2 votes
2 answers
146 views

what is this part/component in this circuit schematic?

I have a circuit schematic (this is just a part of it): I am trying to find what those little circles above and below the speaker are. I dont think they are part of the speaker itself, as there is ...
Vincent Cerowski's user avatar
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1 answer
77 views

ESP32 Schematic review, can't flash using U0TXD U0RXD

Hello 👋🏼 I'm reaching for help, i tried debugging the issue with my current knowledge but to no avail... I have created a ESP32-D0WD-V3 based board, It's pretty basic and cover what i need in a ...
Rayen Ben Ammar's user avatar
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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
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3 answers
62 views

What is the purpose of SW1 in the schematic for a battery gauage IC

Does anyone know what the purpose of SW1 is? The schematic says LED Display but I do not see how this is used for the LED display. The datasheet is found here.
JoeyB's user avatar
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What's the function Q32 in this schematic? - Waveshare E-Paper driver

As I understand, the EPD_RST signal controls the BJT (Q32) which controls the FET (Q31). In my setup I have EPD_RST connected to an IO on an ESP32 and VCC_INT connected to 3V3. My question is, is Q32 ...
Spoons's user avatar
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0 answers
39 views

Arduino circuit design help

Below is my current design for an Arduino project that contains a proximity limit switch and a relay to toggle on/off a small 12volt heater. All other components are very straightforward and are ...
ElectroRag's user avatar
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0 answers
79 views

Script Implementation of SN74HC165NSR

I have a PCB connected to my Raspberry Pi via its PiSound Header. It has 7 SN74HC165NSR shift registers. I'm trying to write a basic script that can read the ON / OFF state of the switches on the PCB ...
Jelani Thompson's user avatar
0 votes
1 answer
41 views

How to use Stepper Motor and GP1S094HCZ0F Photointerruptor to home

I am working on a robot project and am currently working on the neck joint. For this, the head will be turning, and I am using a stepper motor for this purpose as it has more than 180 degrees of ...
Collin's user avatar
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1 vote
1 answer
79 views

Understanding AM/FM stereo receiver schematic

I am working on a parts list to build a AM/FM Stereo receiver (see https://electronics-diy.com/pdf/TEA5711.pdf). It's a design from Phillips Electronics using the TEA5711 IC. It was published in ...
Don Wilson's user avatar
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3 answers
52 views

Varicon Capacitor

I'm making a part list to build a AM/FM radio. The schematic was published by Phillips Electronics in 1994 (see https://electronics-diy.com/pdf/TEA5711.pdf). My first question involves a capacitor ...
Don Wilson's user avatar
0 votes
1 answer
68 views

Help needed in LDO design

I am trying to design a linear regulator. I started with a macro model for the error amplifier and added a pass stage. 50mA idc is the load. My desired output is 1.5V and Vin=1.8V. IBM180nm models. ...
desi_noob's user avatar
4 votes
1 answer
440 views

Is a diode really necessary when exposing USB VBUS as a pin on a dev board?

Hobbyist dev boards are typically powered by USB and the GND and VBUS pins of the USB connector are usually broken out as pins on the board (so, that one can power additional devices connected to ...
George Hawkins's user avatar
3 votes
1 answer
134 views

Altium schematic templates not showing up correctly when applied to schematic

I'm not sure if this is the right place for this question, but I haven't been able to get any help from Altium support and have been trying to solve this for quite a while. I've created 2 schematic ...
RobotGuy's user avatar
  • 103
2 votes
1 answer
620 views

Does DNF (Do not fit) mean that I should remove the component?

I have two schematics. On the ethernet-page, I can see this cross. Question: Does that mean I should not use the resistor there, like leaving ETH_CLK unconnected, ...
euraad's user avatar
  • 1,324
1 vote
0 answers
25 views

Switching to Compiled Tab

I have a project that has number of Variants with many schematic pages. Is there any way to make Altium switch all of the schematic pages to their "compiled Tab" to show the specified ...
shmueld's user avatar
  • 96
1 vote
1 answer
76 views

Raspberry PI CM4 carrier board with Altium : multiple footprint?

I'm currently designing a carrier board for the Raspberry Pi CM4 that physically includes: 1 Compute Module 2 DF40HC connectors 4 Steel standoffs I've encountered a dilemma in generating assembly ...
nowox's user avatar
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0 votes
1 answer
161 views

ESP32 Schematic and PCB Design using Altium

Please review my schematic and PCB design. Purpose of the board is to reduce the current consumption of ESP32. I have used RT9080 voltage regulator. Board is powered either by USB or by battery (4.2V)....
Umar 's user avatar
0 votes
0 answers
47 views

Review of a rocket flight controller schematic

I am currently designing a model rocket flight controller, which is supposed to calculate the altitude using a barometer and accelerometer and fire two pyro channels for two stage parachute ejection. ...
Fazeli24's user avatar
5 votes
3 answers
2k views

How can I design a readable and understandable schematic?

After reading all of your feedback on my flight controller schematic I posted two days ago in Model rocket flight controller schematic review, I redid the entire schematic and tried my best to make it ...
Fazeli24's user avatar
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
1 vote
1 answer
75 views

Raspberry Pi Pico, ensuring the circuit diagram is correct

First of all, thank you so much for your interest in my question. Introduction The following is a schematic diagram I drew up to represent my Raspberry Pi Pico WH - LED lamp project. I am controlling ...
Anjana Silva's user avatar
0 votes
1 answer
72 views

Digital Potentiometer Not Responding in Custom PWM Circuit with Arduino

I've designed a circuit to generate a smoothed PWM signal using an Arduino, which then undergoes attenuation, amplification via a non-inverting op-amp, and finally has an approximate offset of 0.9V ...
Sergio Piccione's user avatar
12 votes
7 answers
5k views

Tie all unused GPIO to GND?

Recently, during a discussion with a senior electronics engineer on an industrial project that operates at 48V and is housed within a metallic casing, a point of contention arose regarding ESD ...
nowox's user avatar
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