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Questions tagged [board]

The tag has no usage guidance, but it has a tag wiki.

2
votes
1answer
76 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?
0
votes
0answers
52 views

Replacing AC transformer

I've encountered a problem while replacing the AC transformer of a soundsystem composed by 3 loudspeakers (1 bass loudspeaker (4Ω5W) and a couple of highs(can't open to see the specs of these)) and a ...
5
votes
1answer
177 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
votes
0answers
40 views

Powering multiple Laser Diodes

Hi I am working on a project that has 6 laser diodes. each pair has different voltage requirements. They are 7V-10V, 3V-5V, and 3V-5V. any suggestions to how I could power each together with one board?...
0
votes
2answers
44 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 ...
-3
votes
1answer
76 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 ...
1
vote
2answers
91 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
votes
1answer
198 views

How to read temperature with STM32F103C8T6? [closed]

How can I read the temperature using an NTC thermistor with an STM32F103C8T6 board??
0
votes
2answers
249 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 ...
1
vote
2answers
43 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
votes
1answer
112 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
votes
0answers
95 views

Multiple connection of bluetooth to android

I am working on a home-automation project where i want to pair multiple bluetooth HC-05 model to my android phone. But the PAIRING only works with only one module at a time. Can anyone help me with it?...
0
votes
2answers
89 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 ...
0
votes
0answers
49 views

Board to Board Power Connector

I'm working on a school project, and am in need of a board to board connector for high current (10 Amp 600 VAC) with "hot-swap" capabilities. I've been looking around for a while, and I've come up ...
1
vote
0answers
808 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
votes
0answers
45 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
votes
1answer
185 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 ...
2
votes
2answers
1k 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 ...
0
votes
1answer
153 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
vote
1answer
402 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
votes
2answers
319 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
votes
1answer
243 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
votes
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 ...
0
votes
1answer
127 views

incorrect voltage applied, dev board still worked

I took this guy from here - http://rlx.sk/en/accelerometer-gyro/3582-vibration-sensor-module-801s-er-sen801svs-.html and without noticing I have applied 3V3 instead of the advertised 5V to it. It also ...
0
votes
3answers
104 views

Power supply board

I am wondering what the component that looks like a fire cracker is in this picture. It feels like paper or possibly ceramic on the outside. There are no markings.
0
votes
0answers
275 views

piezoelectric sensor sensitivity

I am experimenting with this guy - http://wiki.seeed.cc/Grove-Piezo_Vibration_Sensor/ and it seems to be quite insensitive. It won't respond to table knocks when I knock it with the piezo bender ...
5
votes
1answer
216 views

Do I need some kind of licence or any papers if I want to sell a pcb board that I made to different people?

I have made a watch with a microcontroller and a display which shows a real time clock. I want to sell it to my friends officially. Before I do that, do I have to obtain specific certificates for my ...
1
vote
2answers
225 views

1 MHz clock on a perfboard

I'm doing a prototype on a perfboard and I need to use a square wave of 1 MHz at least. The square wave is for a clock pulse and I generate it with a AC generator. I want to know if at that ...
0
votes
1answer
181 views

Foam on bottom of monitor motherboard [closed]

I am currently trying to repair my LG 27MP35 monitor and came across these foam blocks on the bottom of the motherboard: At first I thought they were just something like spacers, but then it didn't ...
0
votes
0answers
78 views

how to really secure a pcb when photo-developing it

I just wasted about $30 in trying to create a large PCB. I made two attempts of removing the photo-resist correctly from the exact same circuit image but failed. In the first attempt, the board was ...
0
votes
1answer
74 views

Old used electronics, can I re-use them for other purposes? [closed]

I have taken apart and had a look at a small dashboard camera which was broken due to the solders on the button going loose and detaching. Upon inspection, I could turn the camera on without it's ...
1
vote
1answer
397 views

Connecting hc-05(bluetooth) with clicker2 with STM32(ARM)

For a school project I a got HC-05 bluetooth module and MikroE Clicker2 with STM32 (ARM). When I connect and use module with Arduino, 9600 BAUD rate and all other settings used with SoftwareSerial ...
0
votes
1answer
228 views

Board layout for a blinker circuit

I am designing a blinker circuit in Eagle. These blinkers are used at roadside for indication purpose. These blinkers contain two PCBs. One is PCB contains 555 timer circuit which generate timing. ...
0
votes
2answers
105 views

How do I read a Board?

I have opened a remote and tried to read it. Quite tricky if I'm honest. I'm trying to replicate this DIY. On instructabels (Raspberry-Pi-GPIO-home-automation). http://www.instructables.com/id/...
11
votes
5answers
4k views

Are circuit boards necessary?

Can I solder the components together? I just started to learn and I don't have a circuit board.
2
votes
3answers
2k views

Why does Altera DE2-115 board GPIO expansion header contain 5V & 3.3V power but the IO standard has no 5V?

The altera DE2-115 board user manual section 4.8 page 47 describes the GPIO expansion header. It is clear that it has 3.3V and 5V power supply. However, it later says that "The voltage level of the I/...
1
vote
2answers
269 views

FPGA board comes with a microprocessor?

I'm looking at this development board from Altera: https://www.altera.com/support/training/university/boards.html#de1-soc It says it has an ARM processor - this has me confused; does it mean the FPGA ...
4
votes
1answer
6k views

Rotate Board and Components in Altium

Can I rotate the components and the board at once? I try hold click + Space bar but it just rotates the component only. Say I already have a 20mm x 10mm board size and I want to make it 10mm x 20mm. I ...
-4
votes
1answer
229 views

I'm looking for this FPC connector [closed]

I'm looking for this board, but I don't know the correct name: Anyone knows the name?
0
votes
1answer
124 views

how do you link components between them on a protoboard [duplicate]

I have the following protoboard (see picture below) Each hole has a distance of 0.5mm I want to link components between them. I found a few ways to do that: 1) Use tiny wires to connect the ...
0
votes
1answer
209 views

Please review my board design

This is a follow up to my question from yesterday about my schematic Please review my RGB Controller I've fixed the incorrect DC jack component that was present in my previous question, along with ...
4
votes
4answers
565 views

What is the application of the SMA connectors on the DE2 115 FPGA board

The SMA connectors are expected to be used for clock IO. However, the board already has oscillator and the PLLs can be used to generate a variety of clock frequencies. Besides, for any daughter board ...
-2
votes
1answer
91 views

Sharing a pushbutton with multiple boards

I would like to have several identical boards (arduinos) each with its own power supply, and daisy chained with some wiring, each board being able to receive a signal to an input pin when a pushbutton ...
0
votes
4answers
1k views

How much Should a Diode Read on a Multi Meter?

I'm trying to self learn all this stuff as I am a programmer not a engineer by trade So any help will be great. I have a Samsung TV Model : UA46B7000WF The Problem is that the TV blew a fuse which i ...
1
vote
1answer
51 views

Perfboad question

I am still confused about working with perf board and solder. but I want to ask, this question: When adding 2 electronic element on a perf board, in series, the start point of element 2 should be in ...
2
votes
2answers
586 views

Error sending data to LED Display board from a microcontroller

I have a LED Display which has a RS232 connector so that we can connect it to our system. Display board accept whatever data we type in hyper terminal and display it. For e.g if I type ...
0
votes
1answer
218 views

Can you help me identify the antenna? Looking to add External Antenna

I'm looking to add an external antenna and I want to find out I add the antenna using a Mini PCI U.FL to RP-SMA Antenna WiFi Cable Signal Connector Network Adapter I got off of ebay to a Trendnet ...
1
vote
1answer
5k views

Cheapest FPGA PCIe board for Software Acceleration [closed]

This question is somewhat related to an earlier question: Cheapest FPGA's. I have been searching for a cheap FPGA board with PCI express 2.0 or 3.x support. Such boards can be plugged in one of the ...
0
votes
1answer
89 views

Using a dev board as final commercial solution

I'm working on a small embedded project which controls electrical usage of a factory/department. My solution is limited regarding the production of the solution: I may sell 50 or 100 per year. My ...
2
votes
1answer
351 views

Build PIC development board on bread board

I have PIC24FJ128GA202 IC only. Since development boards cost too much, I would like to build a development board on a bread board and try some sample programs on it. Like the image below: Is it ...