Questions tagged [reverse-engineering]

The process of taking a completed system and determining details of its design; may have legal limitations or ramifications in different jurisdictions

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

How to extract the program from the programmed microcontroller [closed]

Can the program be extracted from the programmed microcontroller? For example from STM32 or ESP8266. Is this possible? What is the solution?
user avatar
-3 votes
1 answer
56 views

What is the purpose of these strange patterns in i/o port panel of GPU card? [closed]

Ref: https://www.techspot.com/article/1988-anatomy-graphics-card/ The left side pattern seems to get it attached to Graphics card slot- but not sure why those flanges are required. Absolutely no ...
user avatar
  • 2,155
0 votes
0 answers
23 views

Decoding tools for heating system bus messages

I have my Arduino decoding an oj electronics heating system single wire bus 5v Manchester coded messages, and I can see the output on my serial monitor. Each room stat slave sends a message on to the ...
user avatar
19 votes
3 answers
1k views

Identify this type of diode from the 1970s (1.3V forward)?

I am currently reverse engineering the electronics of a Pentax Electro Spotmatic camera from the early 1970s. I have the circuit mostly figured out but now I want to find out more about the particular ...
user avatar
1 vote
0 answers
39 views

Reverse engineering port on laser for rotary attachment

I have a Trotec Speedy 300. It has the ability to control a rotary attachment by plugging it into a 12 pin Molex port inside the printer. The attachment costs over $1500 plus shipping from the company ...
user avatar
0 votes
0 answers
54 views

Intercepting 7 segment display control on a proprietary PCB with unknown IC

So I'm trying to intercept the control of the 7-segment display on body weight scale to display huuuge negative numbers on remote control (to prank my friend). I've cracked the scale open and ...
user avatar
1 vote
2 answers
96 views

Is there any advantage if the PFC inductor is split in between +ve and -ve input line?

While doing the reverse engineering this is what I observed. The PFC inductor is having 8 set of pins , out of which 4 are shorted to input (+) and 4 are shorted to GND (input return). Obviously , ...
user avatar
  • 2,155
1 vote
1 answer
98 views

Gardena Battery Rain Water Tank Pump 2000/2 - UART Interface

I have a garden and would like to water it automatically with rain. For this i buy a «Gardena Battery Rain Water Tank Pump 2000/2» and would like to control via an ESP8266. After opening the control ...
user avatar
  • 11
0 votes
0 answers
54 views

What could the component be if the diode test result shows finite voltages for both orientations?

I was trying to identify a 2 terminal component using the diode test in DMM- It measured 0.420V in one direction and 1.88V in other direction. I am not sure what this component could be. For other ...
user avatar
  • 2,155
0 votes
0 answers
70 views

What is this 14 pin IC that is associated with an ATMEL 312 24C02N IC?

so Basically This is a duplicate question Posted 5 years ago here which is closed with unclear answer. but here i have found something. this is actually a RGB Controller module, it has, 1 12v input 2 ...
user avatar
0 votes
1 answer
84 views

What could be the reason for using line frequency toroidal transformers at the input of a power supply board (with PFC)?

During the teardown of a power supply board, we found a bulky toroidal transformer (similar to image below) at the ac input line (voltage 115V AC). The secondary of transformer is subsequently ...
user avatar
  • 2,155
1 vote
1 answer
73 views

Transistor used in 3 GHz LNA

I've got this 3GHz RF amplifier off ebay, and I'm trying to figure out how it works. I've took the RF shield off, but the markings on the component that I assume is the transistor, are scratched off. ...
user avatar
  • 219
1 vote
1 answer
121 views

How to tell what serial protocol is used on a DB9 connector?

I'm trying to reverse engineer communication between a host and client device that uses a DB9 connector. I'm able to measure voltage between the devices with a breakout board and multimeter. The pin-...
user avatar
  • 115
3 votes
1 answer
73 views

Extract a 6 pin connector pinout with serial protocol

I have an intercom display, Elvox 5721, and I'd like to program it with its software, called "saveprog". It has a 6 pin programming connector which requires Elvox's cable which is called ...
user avatar
  • 31
2 votes
0 answers
148 views

Hacking an e-paper price tag

I've got an e-paper price tag from a friend of mine and I'd like to know if it's possible to change the display contents? On the back it says its a Solu M from 2017,...
user avatar
  • 219
2 votes
0 answers
78 views

Reverse engineering a power supply with more than 600V across the transformer primary

I'm looking at a power supply board for an LCD TV, specifically a BN44-00878A board from a Samsung UE55KS7500. This was originally a repair job, but it turns out the power supply board is fine and ...
user avatar
  • 6,657
2 votes
0 answers
44 views

nrf52-based localization tag flash dump and modification

Lately I've bought a localisation tag (apple airtag alike) When I click a button on my cell phone, the device plays a chiptune-like ringtone. The ringtone is configurable using the app and stored on ...
user avatar
  • 21
1 vote
0 answers
81 views

Reverse Engineering Hot Tub Control Signal

I am trying to reverse engineer the control signal that my hot tub's top side control panel uses to communicate with the main panel which controls the heater, water pump, etc. The tub is an older (...
user avatar
0 votes
0 answers
68 views

What is this "ALB5YD" and "ALBCEA" marked IC does?

I am trying to reverse engineer this router ups circuit. But one strange thing I noticed, there is 3 IC's are present. But only 2 are needed to maintain the bare bone operation. One of the IC is for ...
user avatar
0 votes
0 answers
68 views

Help reverse engineering an RS485 adaptor

I'm trying to reverse engineer a RS485 shield for a Raspberry Pi 3 that was part of a consumer appliance; I'm trying to repurpose it for other projects, but I wonder if it has ever worked. I don't ...
user avatar
1 vote
1 answer
85 views

Understanding/simulating an old amplifier power supply

I have an old amplifier that was home-built by someone, and I'm trying to reverse-engineer the power supply (for a start) to understand how it works, and to educate myself. However, I cannot get the ...
user avatar
  • 163
3 votes
3 answers
1k views

What is the easiest way to extract the schematics from a physical PCB?

I have a PCB containing a power amplifier. I want to extract the schematics from it. It would take a few good hours, but it is achievable. Is there a tool to help me speed up the reverse engineering ...
user avatar
  • 773
0 votes
1 answer
72 views

How to (generally) identify a temperature sensor? [closed]

What should be the approach to figuring out what a temperature sensor is, when taking apart an appliance or “reverse engineering”? This has come up in a couple scenarios for me recently: I am ...
user avatar
  • 141
0 votes
1 answer
114 views

Reverse engineering PCB [closed]

I am trying to obtain the layout and eventually netlist/schematic for PCBs I have. I am wondering what others have tried to understand how a piece of hardware works, obtain a reference design, and ...
user avatar
  • 9
3 votes
0 answers
167 views

RS485 Protocol Reverse Engineering & Replay Challenges

I'm trying to reverse engineer the RS485 protocol used by my home heater/AC. This protocol handles communications between the wired remote control (WRC)/thermostat and the main heater/ac indoor unit (...
user avatar
  • 31
0 votes
1 answer
102 views

Panasonic RX-DT860 mod, how to unmute audio signal?

I have this older terrific sounding Panasonic Boombox RX-DT860 (huge!) and the laser unit of the CD-player died and cannot replace it. The Boombox also lacks an AUX-input, so time to change it, time ...
user avatar
  • 1,032
0 votes
1 answer
127 views

How does this electromagnet control circuit work?

I am reverse engineering an electromagnet control circuit in isolation (I do not have the original controls or wiring diagram). I believe applying 12VDC should trigger the respective magnets, but it ...
user avatar
1 vote
2 answers
281 views

How to import .csv file using Pulse View?

I used an osciloscope to analize a JTAG communication, I exported the data as .csv file do that I can decode it. I'm using PulseView to do it. But I'm having problems to import the .csv file to ...
user avatar
  • 847
1 vote
2 answers
669 views

Help discovering communication protocol used on faulty LCD matrix display

I own a device that has faulty 256 x 64 dot matrix display (flat cable damage + some bug infestation). After a disassembly I discovered that display is connected via 20-pin connect (soldered pins). I ...
user avatar
0 votes
1 answer
86 views

I'm looking for an SMD diode in a (small) haystack, hearing aid repair [closed]

It works, but it buzzes through the earpiece if you turn up the volume much, I'd like to do some signal tracing, but first I'd like a schematic. I found one using 3 NPN transistors that might be close,...
user avatar
1 vote
1 answer
103 views

Interfacing with unknown MCU (COB), unusually high current on input pin

I recently got an oscilloscope with a logic analyser and their first mission was helping me in reverse engineering the communication protocol between two 15-20 years old unknown MCUs (COB). The goal ...
user avatar
  • 13
0 votes
0 answers
139 views

Reverse engineering of metal detector

I am a junior electronics engineer working on a project related to a metal detector. I am facing a problem. The signal from the op-amp (circled) is going into the analog switch (CD4066 IC, circled.) ...
user avatar
0 votes
2 answers
112 views

Reverse Engineering RS-485 Signals - Floating Issue

I'm currently trying to reverse engineer RS-485 signals, see waveforms below. As you can see, Signal 1 (Yellow) and Signal 3 (Purple) are a differential pair and seem to be floating. Here's a closeup ...
user avatar
0 votes
0 answers
205 views

Coaxial Cable Wiring on PCB (WiFi-Card)

*This post is just serving it's purpose as a discussion in case somone chance upon the same situation as me I'm really really new to this, so please bear with me. I got this PCIE wifi card from China, ...
user avatar
3 votes
1 answer
658 views

Dumping the content of a Toner Reset Chip using an Arduino UNO through I2C

I am trying to dump the content of this Toner Reset Chip using an Arduino UNO. I read a lot about these chips and the most intriguing with this one is that it only has GND, CLK and DATA pins. There is ...
user avatar
  • 53
0 votes
2 answers
103 views

Identifying an inductor

I'm trying to reverse engineer a circuit here. I have almost all of the items identified, down to their specifications, except two inductors I'm not very familiar with inductors, so I figured I'd ask ...
user avatar
0 votes
1 answer
53 views

Help designing a data acquisition module

I'm prototyping a shoe that reads the pressure distribution of a person's weight as they walk. In order to accomplish this, I need to design a Data Acquisition circuit board that will be compatible ...
user avatar
1 vote
1 answer
150 views

How does this soldering iron sleep sensor circuit work?

I recently built a unisolder soldering station and am struggling to understand how the detection of the soldering iron within its holder is implemented. The unisolder board itself provides a 3-pin ...
user avatar
1 vote
1 answer
269 views

Camera external trigger; What is the shutter signal?

There is a Sony RX10 III camera which also has a external trigger for it. The goal is to send a signal from a micro-controller (Arduino & optocoupler in between) to release the shutter. I thought ...
user avatar
  • 205
0 votes
1 answer
94 views

What exactly is this op amp being used to do? Bandpass filter?

I am trying to identify the major functions of the different portions of this "clap on, clap off" circuit for a project. It's unclear to me what the purpose is of the section circled in ...
user avatar
0 votes
1 answer
94 views

"TTL OUT" on PCB

I was wondering what this TTL OUT means and what type of cable it takes. I think it might take a display or a camera but unsure.
user avatar
0 votes
1 answer
96 views

Troubles reverseengineering a weight scale

I'm starting a project of wireless body scale, so I bought a scale on Amazon to see the electronics inside. The scale uses 4 load cells, a half-bridge, 4 metal electrodes, a Bluetooth module and a ...
user avatar
18 votes
6 answers
4k views

Why split the resistance on either side of an LED?

In the circuit below, is there any reason why we can't combine R1 and R2 into one 4 kΩ resistor in either location? simulate this circuit – Schematic created using CircuitLab I am reverse ...
user avatar
  • 191
0 votes
0 answers
78 views

Controlling Yihua 995D for USB control

I recently purchased a YIHUA 995D SMD Rework Station and me being the geek that I am wanted to see if I could perhaps control it (via USB/ATMEGA) by using my PC and touch screen instead of physically ...
user avatar
  • 645
0 votes
0 answers
66 views

Philishave (Norelco) HS550 reverse-engineering

My first question here. Image is schematic for Philishave (Norelco in US) HS550 shaver - 110V-230VAC. I am puzzled how this works. I think that on the early part of the positive half cycle the supply ...
user avatar
3 votes
2 answers
176 views

What is the purpose of this current sense resistor in my arc lighter?

I have an arc lighter similar to this one: The switch failed after a couple days (typical Chinese garbage), so I took the unit apart to replace it. Also, due to its operating frequency (~16Khz), it ...
user avatar
  • 1,129
0 votes
1 answer
107 views

Need help identifying SMD DFN-6 component. Top marking 26T6 TIW 957M

I've been trying to reverse-engineer this circuit but I'm an ME, so my knowledge of electronics is limited to pretty much Arduinos. I have a simple circuit and I'm trying to identify one of the ...
user avatar
1 vote
1 answer
154 views

Figuring out transmission protocol in cheap wireless door bell

Due to boredom I've tried some reverse engineering of simple cheap wireless ring bell which uses 433.92MHz transmitter and receiver via OOK modulation. It sends several times the same information. On ...
user avatar
  • 129
0 votes
0 answers
60 views

Radio - Amplifier Connection

This is my first post here, so please give me feedback on how I can improve in the future. Background I am trying to reverse engineer a Becker Grand Prix Stereo Radio with an external amplifier. On ...
user avatar
0 votes
2 answers
155 views

How does this YouTube video's author identify pins with multimeter?

I was watching this video on JTAG. It is mostly too difficult for me to follow, and I will likely learn more about UART first before returning to this. At around 13:00 he uses a multi-meter to ...
user avatar

1
2 3 4 5 6