Skip to main content

Questions tagged [pcb]

a material resistant to electrical conductivity that forms the platform upon which electrical components and wires can be mated (or printed) and connected to form a circuit. Usually confused with printed wiring board.

Filter by
Sorted by
Tagged with
0 votes
0 answers
43 views

unknown smd chip

Can someone help me identify the chip tagged with 0L321? It is part of a RCC switching power supply. It feeds the base of the 13003 NPN switch transistor.
ilfreddy's user avatar
2 votes
0 answers
49 views

Extracting Audio from a Game

Does anyone know a way which audio can be extracted from PCB boards such as this? This is what I captured a long time ago from a game from 1998 called Brain Shift, and based on what I asked so far, ...
Samlaptop's user avatar
1 vote
1 answer
48 views

Chip identification in nonin module

This chip is off the Nonin OEM MODULE III. I would appreciate if anyone can find out what this chip and datasheet is. I have tried looking up the numbers in alldatasheet.com and the company to no ...
Rich's user avatar
  • 11
0 votes
0 answers
42 views

Unable to identify chip

Unable to identify below chip (should be touch controller) this is on a wifi 4 channel switch - overall PCB as below Any help in identifying chip appreciated, need to unload custom firmware to the ...
Sundeep Goel's user avatar
1 vote
1 answer
585 views

Would it be possible to reverse engineer the wooting 60he keyboard to create a new pcb?

Would it be possible to build a pcb that is essentially a copy of the wooting Hall effect pcbs but with different layouts? (Ie: 65% or 75% layouts) Would it be possible to transfer the firmware from ...
Brandon's user avatar
  • 11
2 votes
1 answer
123 views

unknown chip on pcb

Can someone help me identify this chip? The first row is 1647HC. Second row 4069UBF. Tird DB1354. I can't identify the manufacturer logo. I'm new at this.
Reeng2's user avatar
  • 21
0 votes
1 answer
315 views

Identify unknown Atmel chip

wondering if folks can help identify this chip. It looks like ATMLH017 2FCM CN ©2017AB4 Googling all manner of permutations on these numbers has not been helpful. The chip appears next to an ...
Matt Montag's user avatar
1 vote
0 answers
30 views

Looking at a PCB is it possible to ascertain the number of layers it has?

Is there a way to ascertain - without special equipment (other than what a "layman electronics enthusiast" may have around) - how many layers a PCB has? Is there some sort of marking or a ...
0xC0000022L's user avatar
  • 10.9k
1 vote
0 answers
110 views

Finding the function of test points on a router

I have a BCM3383 based cable router here where I ultimately want to dump the firmware. I have serial access to the broadcom bootloader and the linux console. Login for linux is unkown and telnet does ...
firsttry's user avatar
1 vote
1 answer
1k views

In-circuit programming of SPI Flash memory

Is it possible to define (using only visual inspection of PCB and multimeter) whether or not SPI Flash memory can be properly programmed keeping the device In-circuit, without desoldering IC from the ...
Lexx Luxx's user avatar
  • 203
11 votes
4 answers
6k views

Identifying an unknown chip on a PCB

I'm working on reverse engineering a PCB (no documentation by manufacturer). I've identified all the other chips on this board but this one refuses to give up any google-able info. Are there any ...
user4781's user avatar
  • 113
6 votes
4 answers
14k views

How to convert finished PCB to schematics effectively?

I have a PCB board that is a little involved to figure out its working. I spent a good day mapping trace by trace, node by node but still some node connections wouldn't make sense. I know designers ...
user1502776's user avatar
8 votes
1 answer
266 views

How can I work out which PCB layer a via goes to, without destroying the board?

I'm trying to reverse engineer some boards that have multiple layers, but can't figure out any way of discovering which layer certain vias go to. Unfortunately I can't destroy the board with ...
Polynomial's user avatar
  • 1,272
10 votes
1 answer
1k views

Draw circuit of a multilayer PCB

I have found a multilayer PCB of which I need to draw the circuit. At first, I tried to find the circuit on the internet using part numbers, but I did not get any result. The PCB is from a very old ...
user avatar
8 votes
1 answer
1k views

Determining communication protocol

I have two chips that are connected using two lines. One appears to be the clock line (50% duty cycle), but it doesn't have to be (sometimes constant high). The other line appears to be totally random,...
user avatar