Questions tagged [board]

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0answers
18 views

Ebike 24v relay board - switch?

Hi I’m building an Ebike and using a reclaimed relay board from an old electric moped. My question is the relay board has 3 small wires presumably for the switch, but this confuses me as I only need 2 ...
2
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0answers
45 views

What programmable board should I use for my project? [closed]

I have a small project going on, you can call this a research project that I needed to pass a certain class。 But the thing is, I don't know what I should use Arduino? Raspberry Pi? Im a complete ...
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1answer
78 views

Problem with making an Arduino-like board

I'm making my own Arduino-like board with an ATmega328p and an FT232RL. After realizing the circuit (making sure everything was correct) I had some prototypes made by JLCPCB. Later I bought the ...
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1answer
44 views

How to create a break away to cut the board

I am not a expert with Eagle 9.6 but I created a nice PCB. A friend of my is going to assembly the part with a pick and place machine. He asked me to enlarge my PCB to be able to fix the board and ...
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4answers
95 views

Fine wire for breakout board soldering that won't break

I've been using silicone sheathed stainless steel wire (30 awg) with a 1.27mm breakout board. The wires cannot be secured (it's tight in the thing I'm building), and they easily break off at the point ...
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0answers
21 views

How to connect BMS board with balancing board to make a battery pack?

I’ve got BMS board without balancing feature and a balancing board. I want to know how to connect them to make a battery pack.
24
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8answers
3k views

LEDs on boards - pros and cons?

OK - I tend to design high value low volume boards so my view of this is biased. I like to sprinkle a lot of LEDs around my boards. One (red) LED for every power voltage on the board. Multiple s/w ...
1
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1answer
42 views

Using a Renesas evaluation board as a Programmer

I am new to using renesas microcontrollers, and could use some advice from someone with experience using them. I found this rl78 evaluation board and a quick reading of the product description on the ...
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2answers
82 views

Development Board

i gained some experience with ARM and especially with STM32 MCU models.Now i wanted to start learning x86_64 architecture and my initial goal was going towards it. Is there any good development boards ...
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0answers
22 views

Bluetooth Receiver Board - Noise Problem

I recently bought a bluetooth receiver board in order to add bluetooth to my car, this however is not as easy as I thought. I am not very skilled with electronics. I have an aux audio input in my car ...
0
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2answers
74 views

Do electronics companies publish the diagram of their electric boards

I'm new to the electronics world, and I came to know that electronics companies (As Fairchild) provide datasheet for the components they produce (As IGBT, Triac, etc.). Do electronics companies (As ...
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3answers
70 views

Can I build a 4A circuit on cardboard?

I'm planning to build a 12V 4A circuit, and I was originally going to put it on a strip board. However, the board I ordered came broken (and each piece would be a bit small for building a circuit), ...
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1answer
56 views

Can you help me identify this board?

I have found this board installed and I am unsure what it is or what its function is. I have googled it to no avail.
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0answers
26 views

Position of global fiducials

I have two question for placement of global fiducials on my board: In the board below you see two fiducials and a component (SMD connector). I would like to place the connector on the very edge of ...
0
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0answers
135 views

How to refresh many capacitors quickly

I'm working in an embedded space, where I need to keep voltages on a bunch of capacitors (RC circuits). Currently, I have an EEPROM with some data value for each capacitor. There is 1 DAC that feeds a ...
2
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1answer
66 views

What is the role of the four-pin header on this USB relay board?

This is a commonly available relay board with a USB HID-like interface. I haven't been able to find a datasheet for it on the sites that sell it. On its right side there's a four pin header. I'm ...
0
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4answers
84 views

How can I calculate the minimum switch time between main battery and back-up battery for my board?

I have UpSquared board for an embedded system. I have a main power supply(battery) to feed it and I also have a back-up battery for some situations. For example, something happened and main battery ...
1
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1answer
54 views

In sale or custom made?

RJ45 to 8 pos board connector. Board connector width: 12,4 mm Pin pitch: 2 mm Found inside a plastic card printer. Somewhere to purchase cable? Identification of the board connector?
0
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3answers
55 views

What is the typical delay relative to to the maximum delay?

I have a board with a number of ICs, an FPGA, and some flash and RAM devices. The board is designed based on worst case conditions, as it should be. The critical combinatoric path has a maximum ...
2
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1answer
223 views

Low cost connector for two stacked PCBs

I know we should not ask for product advice here, but I searched a lot for a specific board connection solution lately and it almost drives me crazy that I have only found so little options. I need ...
4
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1answer
205 views

Dave Jones' uCurrent Gold - trace to shunt resistors has no soldermask

I was going through the uCurrent project and noticed something that seemed unusual to me. In the image, the trace connecting R1 to the input jack is (a) of differing trace widths, and (b) has no ...
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3answers
289 views

How does a board file (brd) differ from a Gerber file? Why use one over the other?

There are several graphical PCB viewers available and they read what appears to be a standard board file (.BRD) format. Eagle and other PCB designing applications generate board files, but also ...
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0answers
29 views

Raspberry pi not getting any data from hx711

I'm trying to combine two boards into one: SparkFun Load Sensor Combinator(basically just a wheatstone bridge) and SparkFun Load Cell Amplifier. The data will be transmitted to a Raspberry Pi 3 so ...
4
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1answer
3k views

What item could this PCB board be from? (NOT serious, misc. question) [closed]

This is a fun, light-hearted question and not meant to be taken too seriously. As a little fun thing between a group of friends, we found this question on a desk at work sometime ago about a PCB that ...
0
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2answers
87 views

Board to board connectivity [closed]

Need to connect two boards together. Initially I thought about using a ribbon cable like this one, but everything I found was significantly longer than what I needed (~30mm max). Are there any other ...
1
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2answers
166 views

Is there software for converting a picture of a board into an schematic?

I need to reverse-engineer several simple single-sided boards. I have very good quality pictures of them so I was thinking that maybe there is software capable of getting the schematic from the ...
1
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1answer
113 views

What is the proper term for a board that replaces a chip?

I've been working on some vintage electronics lately. In the course of this work, I've found that in some cases it is much easier to design a circuit to replace an old DIP chip that has failed than ...
2
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2answers
129 views

Copper layer delaminates on Printed Circuit Board

I have been making the PCB boards by the conventional process since last few years (pressing, etching, drilling, soldering). I usually iron the photo paper to the PCB board for around 15-20 minutes ...
0
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2answers
73 views

Reading current memory image from a micro controller

I have the MPLAB XPress Evaluation Board, which has the PIC16F18855 microcontroller on it. The way to program it is just to copy a ...
0
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1answer
81 views

What is Mikrobus purpose?

I'm new to embedded systems. I have MPLAB Xpress Evaluation Board. I see that the board has MikroBUS connectors. Going through the internet, I couldn't understand what is the purpose of the MikroBUS? ...
0
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1answer
223 views

What QSPI chip is on ItsyBitsy M4 Express?

I'm trying to find out the name of the QSPI chip that is used on ItsyBitsy M4 Express boards. On the image below is very faded:
2
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1answer
2k views

Can I use a 22 microfarad capacitor in place of a 10 microfarad capacitor?

I have a bad 10 microfarad capacitor 400V but can not get a replacement. Can I use 22 microfarads 400V instead?
5
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1answer
189 views

Named nets not connected in Eagle board design

I set up my schematic in Eagle and used named nets to make all of the connections. If I highlight any of the connections in the schematic everything lights up properly. When I switch to board design ...
0
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2answers
112 views

I2C Put One Termination Res at the End or on Each Slave Board

I Have a system with I2C bus wired just like this: My questions is which one is better: put the termination pull up res at the end of connection (on the last board), or put pull up res on each slave ...
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1answer
79 views

What makes a microcontroller development board powerful?

I'm seeing an awful lot of dev boards on the internet that arent Raspberry Pis or Arduinos and I'd like to know what makes a board powerful? Whats the difference between a board that may be used in a ...
0
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2answers
224 views

What bluetooth chip should be purchased to solder onto the Nook motherboard? [closed]

From what I researched the e-reader's motherboard contains three unused serial ports that can be connected from gps modules to bluetooth chips. U2713 PIN OUT CLOSEUP The article that gives ...
-2
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1answer
605 views

How to read temperature with STM32F103C8T6? [closed]

How can I read the temperature using an NTC thermistor with an STM32F103C8T6 board??
0
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2answers
746 views

STM32 -ADC ERROR

I have make an STM32F030F4P6 board for reading analog values. When I connect the analog pin to vcc the value is 4095, instead when I connect the analog pin to GND the value isn't 0. How can I solve ...
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2answers
46 views

Building Custom Eagle part with bad documentation

maybe trial and error is the only solution here I'm trying to build a custom eagle part for board placement. This is the first part I've built. I've got the pins properly placed, but I'm trying to get ...
-3
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1answer
269 views

Electrical panel indicator lights flickering [duplicate]

I'm wondering what the underlying mechanism of the flickering of the panel indicator lights is. Are there electronic oscillators of some kind in there?
0
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2answers
204 views

EMC test for PCB board without housing

Our company is exporting our product to European market. To sell it to Europe we need CE mark. so we let the test lab test only EMC(EMI+EMS) because our products usually don't equip any RF nor AC ...
1
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0answers
1k views

HC 05 bluetooth module not working with stm32

I'm trying to get a HC-05 bluetooth module working with stm32f103c8t6 module(blue pill). I used this usb to serial module to test each of the aforementioned boards and this Android app to connect to ...
0
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0answers
48 views

Can a power board impact watt meter readings

I've just measured two different but conflicting readings using an off the shelf watt meter. My quandary is that these measurements conflict and seem untrustworthy. My question is: whether measuring ...
2
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1answer
194 views

Can anyone tell me if there are any logic gates built into this circuit board?

We have these circuit boards that we use at work for indication of whether a door is open or closed... To be honest, I have no idea how they work. I drew up a diagram of it to see if anyone can ...
4
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3answers
2k views

Why do most battery protection circuits have 2.5V discharge cap?

I was looking for a battery charge- discharge circuit from ebay, and most if not all, state to have overdischarge protection voltage at ~2,5V. Isn't this way too low? By my knowledge Lithium batteries ...
1
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1answer
379 views

What are these values on this capacitor?

As you can see from the images, this capacitor needs replacement, however I do not know what the top 2 values mean. It doesn't state it's capacitance either... I assume the first value is decijoule ...
1
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1answer
817 views

Perfboard/Stripboard insulation techniques and what material to use [duplicate]

I most often make circuits on perfboard. Below is an example of a circuit, both bottom and top sides: This circuit will be in a case but outdoors for many months. In case of some rain leakage or ...
-2
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2answers
379 views

STM32 beginner board [closed]

I want to buy an STM32 development board, and I was thinking to try one of these really cheap ones on eBay (from China). My choice is the following: Core407V STM32F407VET6 STM32 Cortex-M4 Development ...
0
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1answer
284 views

Smiirl Fliike Board [closed]

Hi Does anyone know what type of board that Smiirl uses for their Facebook counter? Is it a Arduino? Or something else Best regards
10
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2answers
2k views

What is this waxy stuff?

I just opened up an old piece of electronics. While salvaging, I found a board with this waxy stuff on it? What is this and what is its use? P.S. The substance I am talking about is the lightly ...