Questions tagged [pcb]

PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

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15 views

Connecting iM881A-M to Arduino

I want to connect iM881A-M LoRa module to arduino. And I want to ask which external parts I need to connect it. In datasheet there are many parts that I think I don't need to use. Please help me , I ...
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Printed circuit edge trace

I want to know the purpose of copper edge trace in the following circuit:
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1answer
72 views

Why did a trace blow in seemingly low current application?

I recently designed a board around the D12F200A buck converter; I use it to convert from 5V down to 1.4V. Earlier today, I increased the load on the converter beyond what I had ever done (still well ...
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How is a cryptocurrency asic Miner built, is it possible to build one from scratch? [duplicate]

Is there a source where I can learn how all of this works from the ground up? and If I were to build/learn how much would it cost?
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67 views

Energy consumption of mathematical operations

Are there any general estimates of the (relative) power consumption of mathematical operations in electronic circuits? Surely, this is chip-dependent, but for example, ...
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1answer
33 views

Is it possible to make a keyboard with “Game Controller” style printed circuit boards and buttons?

For a long time I've wondered if it's possible to make a keyboard with PCBs similar to the ones used in NES controllers or just video game controllers in general. If it can be done with keyboards it'd ...
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3answers
47 views

About the mechanical layer in altium PCB

I have downloaded the footprint for ATmega32 SMD as in the figure my question what is the need for the mechanical layer with purple and green colors in this foot print (and after fabricating the ...
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1answer
75 views

What does “JA” Stands for on PCB?

I was trying to understand the circuit of my mechanical keyboards. There was a point abbrevated as "JA" on the board. What does JA stand for?
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2answers
109 views

Will diagonal PCB traces affect a sensitive CPU circuit?

I am trying to design a Z80 Computer Boards from scratch, just relying on the Z80 datasheet and some assembly language tutorials (I have no experience with the Z80 and never used them before but I am ...
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1answer
74 views

Modify PCB Mains Voltage input to 12VDC

One of my amplifiers has died so I need to find out if I can hookup a spare I have lying around as per "Section B" of the below block diagram. I have done the same modification before on ...
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53 views

Need help incorporating a PWM into a circuit

everyone I hope you're staying safe. To preface I am a noob at electronics, and I've learned a lot these past weeks. I need help designing with designing a circuit. To explain my project: I have a ...
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1answer
59 views

How to solve this error for PCB Design in Altium Designer?

I am new to PCB designing and Started with Altium Designer for PCB Design. I have created the Schematic doc for Arduino Nano with all its components having their schematic and Footprints in the ...
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1answer
49 views

System architecture for varying number of peripherals [closed]

I have a hardware system, which I need to control/monitor through the PC. There are multiple peripherals which are known, but some might be added in future, and some might be modified later. To be ...
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PCB Layout - Transistor to convert analog signal to digital pulses - how to connect emitter GND

If have designed the following circuit to convert a certain analog signal of an amplifier to digital pulses. The circuit works well - except for one point. My prototype PCB has 4 of these amplifiers ...
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1answer
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Can HASL finish be used for castellated pads?

I am designing a PCB that uses castellated edges to connect to the parent board. I would like to use HASL finish to save on costs for prototyping, but I am concerned that the non-planar surfaces of ...
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How to achieve clearance for the mechanical pin and vias from ground plane in PCB Editor?

I am a beginner, trying to learn the PCB Editor myself. I have to assign layer-2 as ground plane. I managed to assign layer-2 as GND as planned. But, now my mechanical pin and other high speed signals ...
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2answers
59 views

KiCad placement using coordinate system

I am new to KiCad but have extensive experience with Allegro: The goal create a rectangular board outline that is 55 x 30 mm with the top left corner at x,y 0,0. This is possible in OrCad through the ...
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1answer
54 views

Differential signalling help

I am designing a board around the RBp CM3+ and would like to know more about how to wire the camera and USB pins. On the RBp CM3+ data sheet, it is stated that the USB pins like USB_P and USB_M must ...
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3answers
53 views

PCB copper fill

Hi I am new to PCB design and Im still learning. I am wondering what is the reason behind copper fills? I searched online but I could not find an good explanation of the reason of using the copper ...
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1answer
52 views

Way to connect test points on circuit board when both sides of board must be accessible?

I have a commercially made circuit board with multiple 7-segment displays (HSP-H103) soldered into it. I need to test the displays to make sure all of the segments work for each one. The problem is ...
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1answer
54 views

Probable issue with 74HC595 not outputting ANY data

Context: I've been working on a simple PCB design that randomly lights up a cathode of an IN-19V Nixie tube. The driving circuitry is as follows: PIC16F15313 toggling various lines into the 74HC595; ...
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53 views

Can I debug this simple circuit without VNA and proper RF equipment?

I am debugging a very simple circuit (existing PCB, not designed by me) that downconverts an AM modulated signal at 900 MHz: The problem: What I measure at "Vo" does not match my LTspice ...
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How to use charging adapter to charge Lipo battery through a female USB C receptacle?

I have successfully created a solar operated (7.4 V 20W PV panel) battery charger to be able to charge my 3.7 V 1 cell lithium battery practically for free! I have attached my schematic below for ...
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1answer
68 views

Choosing a non specific heatsink

I am designing a PCB board, and it has lots of components on it. It has like 8 MOSFETs, diodes, fuses, current sensors, a STM32 and other components, and with an exception to a few (like mosfets and ...
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1answer
43 views

USB-C as power source and negotiation with USB 2.0 and 3.0

I have a PCB that currently features a Micro-USB used only for data transfer, and a separate 5V power supply input jack for powering up the device. The device's maximum drawn current is 600mA. To ...
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45 views

Do I glue the screw when mounting the PCB to enclosure or not?

Well, this is a handheld device we are developing at our firm. We bought the enclosure from a chinese man. in AliExpress. It's made out of ABS. The device is going to be used in an industrial site. ...
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1answer
37 views

Printed circuit board connector identification

I have a PCB with some connectors and wanted to identify which type there are of. How do the experts approach the problem, to identify the type? For example, the picture below shows a connector, ...
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3answers
154 views

Electronics before Linux [closed]

I have been learning about the basics of electronics, and reverse engineering hardware using UART connected to my computer. I find it interesting how I can access the busybox which is Linux and then ...
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2answers
71 views

4 layer PCB, mixed signal, multiple different voltages

For a mixed signal PCB with DACs, ADCs, MCUs and multiple analog opamp circuits. With +/-15V to power the opamps, 3.3V for all the digital stuff and a couple reference voltage rails (1.5V and 3V). Can ...
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3answers
93 views

Sanitizing of electronic items during COVID [closed]

I am considering to purchase a new desktop PC ( components, will assemble myself ). I am worried about the inability to use everyday sanitizers to clean, for example, a motherboard. Is there any ...
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1answer
72 views

Automation - Stealing a signal from a circuit

I am a software designer (for reference). I struggle with electronics and signals. I have a device that has a microswitch that completes a circuit with a PCB. I would like a way for that microswitch ...
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29 views

Altium Designer PCB editor text too small

I have this annoying issue with Altium where the text of the net names on pads, vias and tracks in the PCB editor (and in pcblibs) is way too small. I looked all over the defaults, tried resetting ...
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83 views

How unsafe is it to use a 10 amp fuse with a trace designed for 4 amps?

Obviously I am a hobbyist and yes I am messing with mains. I do understand the danger which is why I'm asking this question. I originally wanted to make a PCB that can handle 10 amps but I couldn't ...
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Requesting help identifying potential damaged resistor on PCB

The picture is a motor control board which recently failed. The digital console indicates some problem communicating with the motor. Inconsistent power supply and moisture MAY have played a factor. ...
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4answers
126 views

What features should/must be present inside a prototype FPGA board to aid in debug?

When making any prototype PCB it is always a great idea to have features within it that can be used to aid in debug of the design. A few examples are: Use the largest FPGA available that has ...
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36 views

What do the arrows mean in this schematic? [duplicate]

What do the arrows mean on this circuit diagram? It is for this component: https://lcsc.com/product-detail/Audio-Video-Connectors_Korean-Hroparts-Elec-PJ-399E-6A_C128993.html
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37 views

How to turn a Ready PCB to an artwork illustration? [duplicate]

Every time I'm looking for a pinout for some module I come across illustrations like this: https://electropeak.com/learn/wp-content/uploads/2020/03/Arduino-Buying-Guide-Arduino-NANO-pinout.jpg https://...
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Can you use two smaller traces if there is not enough room to route one big trace?

I don't have enough room to route a 2mm trace. Can I split it up into two 1mm traces?
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32 views

Can an ExpressPCB “.pcb” file be converted/imported to any other format?

I was given a .pcb file and I'd like to view it to confirm it's a valid file and at least minimally what I was expecting. ExpressPCB .pcb files are a proprietary format. I use MacOS so a native app ...
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1answer
49 views

How to tap a pin on very small surface mounted IC

I have very small surface mounted IC (see link https://www.st.com/resource/en/datasheet/stm32l486qg.pdf). I need to access some pins on the IC in order to perform ETM trace. My challenge so far has ...
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1answer
36 views

Choose impedance value of ferrite beads at any frequency

For example, in my PCB I want to use an SMPS IC but Vout will have noise. The SMPS works with 2.5 Mhz. What should be the impedance value? How can I choose this value?
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55 views

What is the best method for placing text on copper?

I've been wondering what is the best method electrically for placing a text on a copper layer? I have a full GND polygon on the top layer. Should I just make the text a cutout from the solder mask so ...
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1answer
58 views

Using multiple 4N25 optocouplers - Approach for compact PCB design?

I'm working on building an Ardunio Nano device that detects if automotive 12V circuits are on / off. I was able to successfully build & test a sample circuit provided Phil Frost. The question I ...
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71 views

STM32F103 random reboots

we have made a 2 layer board for a STM32f103, and apparently it works fine but we get a random resets now and then. When that occurs there is a 1 in the Bit 27 PORRSTF: POR/PDR reset flag and Bit 26 ...
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40 views

Replacing a PDIP-IC with a SOIC-IC

On one of my boards we were using integrated circuits with PDIP layout. Some of those ICs died recently, and we wanted to replace the ICs with newer versions. Unfortunately, now we only can buy SOIC ...
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1answer
77 views

How to decide whether to place a microcontroller on the top or bottom side in PCB layout?

How to decide whether to place a microcontroller on the top or bottom side in PCB layout? What are the advantages on the top side? What are the advantages on the bottom side?
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57 views

DIY Bluetooth speaker circuit won't turn on

I'm making a Bluetooth speaker and made a schematic which I'm using to follow to build the speaker. It's loosely based on this DIY video I saw online, here's the picture of the relevant parts I ...
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1answer
63 views

Upload firmware to many controller ICs at once

I have some 100 Atmega328 IC boards. I want to upload firmware in all of them at one go and I have the final firmware code. Is there any method by which this can be done? I was reading somewhere that ...
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1answer
36 views

Flasher unit to PCB socket mount

I’m making an automotive circuit using a third party flasher unit such as this one. I feel these units can be a source of failure so I want to be able to remove and replace a faulty unit a few years ...
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65 views

4000W Dimmer Eagle PCB Design

I am trying to learn how to design PCBs, and for that purpose I am copying the simplest PCB I could found, a 4000W Dimmer: The Squematic is this: It has the next components: 1 TRIAC BTA416008 (...

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