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Questions tagged [reverse-engineering]

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

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Reverse-engineer Bubendorff CLEP21 remote controller [migrated]

TLDR; I have a Bubendorff shutter system, whereas each shutter has its own remote controller. I am trying to clone the remote controllers, to build a single system for shutter control. Based on my ...
Marko Gulin's user avatar
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1 answer
76 views

How to isolate a chip from a board without unsoldering it?

I have a board from some device with SPI flash memory chip. I also have a separate CH341a programmer for such chips and I intend to read the SPI flash memory chip from the board. Now I want to do this ...
Arthur  Bulakaiev's user avatar
0 votes
1 answer
52 views

Can heat sinks and/or heat pipes be retrofitted onto an existing electronic device?

I have a USB hub that is going into an additional enclosure that is fairly airtight. This USB hub is only rated for 0C to 40C operational, however it will need to survive hotter and colder ...
RoyGBivJr's user avatar
2 votes
1 answer
95 views

What are the purpose of these components on my car ECU?

What are these metal "cages" around the capacitors as seen in the circuit below (2x).
wgthompson's user avatar
1 vote
1 answer
77 views

Can I operate DVD Drive Tray Mechanism without PC? [closed]

I want to make a motorized drawer using a broken DVD drive. I'd like to use the tray mechanism as a whole if possible. I can drive the motor by directly applying power to it, but I don't want to add a ...
sword1st's user avatar
  • 113
0 votes
2 answers
162 views

How to extract firmware from STM32F437

I found a board with STM32F437II chip on it. Apparently it has built-in flash memory to store the firmware. Is there a way of extracting this firmware for further analysis and reverse engineering? ...
mopalinski's user avatar
1 vote
1 answer
101 views

Monitoring an LED state from another circuit via an optocoupler in ESPHome

I am attempting to control a KVM switch using ESPHome on a D1 Mini ESP8266 board, so learning some electronics along the way. The KVM has the main unit and a controller on the end of a 4 core cable. ...
Ben Swinburne's user avatar
0 votes
1 answer
129 views

What protocol is shown in these scope traces?

I have a PIC16F1937 series processor on a fire detection control card. I receive the output signal through Rx connections. I cannot figure out the protocol despite all my attempts. The signals present ...
sqrttp's user avatar
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1 vote
1 answer
107 views

Replacing clock crystal with signal generator [closed]

I have this blob chip module that I'm reverse-engineering, that ran off a 12 MHz crystal. In getting the module out I broke the crystal. It was a two pin through hole component. Big orange blob marked ...
dragoncoder047's user avatar
0 votes
1 answer
95 views

Are these old graphic controllers all the same die packaged by different manufacturers? [closed]

I am looking at old ISA graphic adapters that would provide a simple black and white text mode. I am trying to make the design as simple as possible and I would like to make the PCB as small as ...
tpimh's user avatar
  • 513
2 votes
3 answers
1k views

What causes a digital signal to look like this?

I’m reverse engineering an existing microprocessor to microprocessor serial signal. When I put my scope on the target device I see the clock and data lines just fine on my scope when I connect it to ...
DaveInPA's user avatar
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0 answers
58 views

Why does this pulse generator have a voltage inverter?

I am designing a fast pulse generator, inspired by Leo Bodnar's pulse generator, using the ADCMP572 ultra fast comparator. It looks like a pretty simple device, using a PIC microcontroller to drive ...
Rocketmagnet's user avatar
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1 answer
43 views

SMD component on a dotmatrix printer driver board

This SMD (code: 327G) is mostly used between data lines from the microprocessor and (possibly) some solenoids of a dot matrix printer. So it should be some switching device. I redraw related part of ...
kemal's user avatar
  • 95
2 votes
1 answer
123 views

Reverse engineer BLE LED strip protocol

I am trying to create a custom application to control some Bluetooth-controlled LED strips. That is, I would like to reverse engineer how they are controlled without having any datasheet -- I'll ...
Quazgaa's user avatar
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2 votes
0 answers
68 views

Can anyone identify this IC marked AFGMG?

I am reverse engineering a PCB. It has an unknown IC marked AFGMG. IC details: Name on IC = AFGMG 8 pin IC size = 1.6x3 mm It looks like this phone cannot send a better picture. PCB: Schematic: If ...
Monesh Rathod's user avatar
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0 answers
54 views

BLDC motor driver identification

I have one mystery fuser motor assembly from a HP color LaserJet 9500MFP laser copy machine. I would like to use the BLDC motor in my own project and control it with an Arduino, but I cannot find any ...
Tomas Antola's user avatar
0 votes
0 answers
117 views

Reverse engineering water heater power control board

I am trying to reverse engineer a water heater power control board that I have found in a hot water dispenser. In the original machine, it powers a 2000 W heater (which I will keep) and is connected ...
SamOG's user avatar
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1 vote
1 answer
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Confirmation that IC with marking CMS69F113D is in fact CMS69F613 (or similar)?

As the title implies, I've got an IC marked CMS69F113D and I suspect its similar to, if not a cheap ripoff of, the CMS69F613. A little context first. I have a laminator, which I'm using to toner ...
ElectroBadger's user avatar
5 votes
1 answer
794 views

Electromagnetic Pendulum Pulse Driver - Having Trouble Getting Circuit Running

Now I'm not super well versed in circuits though I've dabbled a bit in some circuit building in the past. I'm working on an electromagnetic driven pendulum for a clock I'm building. The Schematic I'm ...
3nigma_'s user avatar
  • 71
1 vote
2 answers
122 views

Reverse engeneering the control of an inductor

I tried to make the schematics of a toaster of mine. I don't have access to the toaster anymore but here is a part of the schematics I got. It shows the control of the inductance that acts as a magnet ...
InfiniteLooper's user avatar
1 vote
2 answers
316 views

Connecting to STM32 via SWD, Reverse Engineering

I have been reverse engineering my electric longboard remote for the past couple days and have been attempting to get a ST Link V2 connecting to it via some test pads on the PCB I found. I know the ...
Conner Replogle's user avatar
1 vote
2 answers
77 views

How to open hermetic TO packages?

I would like to open a TO-18 can to look at die-bonding/heatsinking and do some electrical experiments with increased airflow. Is there a non-destructive way to do this? My only thought is to drill a ...
bobuhito's user avatar
  • 544
1 vote
1 answer
96 views

How can I line up top and bottom photos of a PCB?

I'm trying to reverse-engineer a PCB. I have some photos of the top and bottom, but lining them up is tricky as they were taken free-hand. Is there an easy way to line them up?
Nick T's user avatar
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1 answer
73 views

Reverse engineering, transistor function in this subsystem

Based on a previous question: What went wrong in my reverse engineering? I reverse engineered a toaster. I can isolate a subsystem of the schematics as follows: VDD is around 20V DC over VSS. We ...
InfiniteLooper's user avatar
0 votes
1 answer
123 views

What went wrong in my reverse engineering?

I am reverse engineering a toaster. I have the following part of the circuit that I don't understand. Let me explain what I have at the moment: We have a potential difference of around 20V DC coming ...
InfiniteLooper's user avatar
1 vote
4 answers
134 views

Vintage LM317T Linear PSU Improvement Suggestions

Recently I came into possession of two very old linear PSU devices from 1993. I replaced the caps and tested the devices and both work. I have been using them in conjunction with 12 7Ah lead acid ...
Jonas's user avatar
  • 179
0 votes
1 answer
70 views

LED switching schematic explanation help

As an electronics engineer, I'm embarrassed to say that transistors have never been my strong suit outside of amplifiers, and I need a little help deciphering a schematic. I have reverse engineered ...
Nunya's user avatar
  • 3
0 votes
0 answers
171 views

Velux controller and input panel seem to communicate via a bus wire with a pull-up without resistor, how?

I'm trying to replace a Velux input panel (WLI 130) with an ESP32 or Arduino so that I can automate the Velux windows by telling the ESP over wifi to open/close the windows. Before doing that I'm ...
Tim Diels's user avatar
  • 101
1 vote
1 answer
76 views

Are iCE5LP1K, iCE5LP2K and iCE5LP4K FPGAs actually the same device?

In official datasheet, iCE5LP1K has less logic elements than the larger models: However, the iCEcube2 tool shows them all to consist of 20x24 array of logic blocks, each having 8 logic elements. This ...
jpa's user avatar
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1 vote
1 answer
134 views

Earth Grounded 12V DC System

I'm very confused about this design i've come across in the field. A data acquisition system is powered by a 12V ACDC power brick. But then inside of the chassis is a DC-DC converter, also isolated, ...
BobaJFET's user avatar
  • 1,012
1 vote
1 answer
267 views

Reverse engineering my robot vacuum

I am reverse engineering my Dirt Devil M612 Spider 2.0 vacuum cleaner as a hobby project, such that later on, I can use a micro-controller to run it myself. I was looking into how the motors were ...
Mart's user avatar
  • 376
5 votes
2 answers
700 views

Inside a 2N3904 transistor TO-92 package

I cracked open this 2N3904 transistor. I lack the means to test its function until tomorrow. The die doesn't look like anything I've ever seen before. I'm not quite sure where the silicon is. In your ...
Aaron Butkovich's user avatar
0 votes
2 answers
99 views

What damage or reduced performance would result from giving 120 V, 60 Hz AC power to a 115 V, 400 Hz AC/DC rectifier?

This is part of a larger project, and is one sub-question related to a higher-level question I've asked on Reverse Engineering. You may find useful background information there. I have a controller ...
Eric Jackson's user avatar
1 vote
1 answer
272 views

Generate netlist from manufacturing files in Altium

I have manufacturing (gerber) files as well as BOMS for a whole bunch of PCB's. Edit: I have the following available to work with. BOM, gerber, NC Drill, ODB++, pick & place. I desperately need to ...
BobaJFET's user avatar
  • 1,012
0 votes
0 answers
137 views

Strange noise in analog laser pulse detection circuit

I have a laser radiation detection and amplification circuit board. Its schematic is not available due to property restrictions. I made an attempt to analyse and reverse engineer the board. I ...
kakeh's user avatar
  • 614
1 vote
1 answer
164 views

Identifying MCU communication protocol in low-power toy

I am new to analyzing logic traces. Using a Salae Logic clone sampling at 8 MHz, I used PulseView to run a capture on two connected Radica Cube World figures. It looks like only one of the connections ...
Nathanael Gentry's user avatar
0 votes
0 answers
134 views

Circuit identification/functionality: Mercedes-Benz start-stop button (MB part no: A2139055500)

As a first PCB reverse-engineering project trying to understand the logic/function of Mercedes-Benz start-stop button. Mercedes-Benz part no: A2139055500. Did my best to draw it up in EasyEDA as I ...
tiblu's user avatar
  • 101
1 vote
2 answers
113 views

Pinout on legacy audio jack

The headphone jack on my old (= 20th century) Daewoo TV 20A5 is broken -- the tip of a plug is stuck inside. As the TV itself is working fine, I would like to replace the jack, or rather jerry-rig a ...
tlossen's user avatar
  • 111
0 votes
1 answer
74 views

Understanding how audio is encoded on mysterious device to reprogram it

So I found a chanting lotus flower in the woods and I'm trying to figure out how to reprogram the audio on it... It has 4.5 hours of audio(!) stored on a 16MB flashrom, and is driven by a chip called ...
Captain Lavender's user avatar
0 votes
2 answers
240 views

How can I measure voltage with this circuit?

In our company, we have developed our own ampere-meter that transfers the measured data to a PC via USB. An employee who no longer works for us created this. The circuit board of the measuring device ...
Dario Casciato's user avatar
0 votes
2 answers
519 views

Switching circuit for changing HIGH- / LOW-level-trigger

On my smart home controlling PCB I want to add some relays. As I want to be flexible with signaling I want to add a jumper to be able to switch between HIGH and LOW level triggering the relay (3V3 ...
alve89's user avatar
  • 113
0 votes
0 answers
121 views

Can I get the current rating of fuse wire from its gauge?

I've got a very old piece of equipment with no manual/documentation/labelling that uses plan bare fuse wire in several locations in the wiring, that I'd like to replace with standard cartridge fuses. ...
John U's user avatar
  • 7,159
1 vote
0 answers
83 views

Locating flash chip for dumping firmware

I'm trying to dip my toes into reversing and thought that dumping and inspecting the firmware running on this controller/pcb would be fun learning, however I'm having trouble locating the flash chip. ...
arrayCobbler's user avatar
2 votes
1 answer
669 views

Help repairing a Bosch oven control board [closed]

I need help repairing a control board for a Bosch oven. How it started: The oven would pop the fuse whenever it would be plugged in the socket -> short somewhere. I opened it and tested a few parts ...
Stazh's user avatar
  • 63
2 votes
1 answer
67 views

Reverse engineering hardware serial interface, unexpected output in PuTTY

I have a Chinese laser controller with a touch screen interface. I've worked out that the touch screen is a standard off the shelf product communicating via RS422 with a custom control board. I'm ...
M Crozier's user avatar
0 votes
0 answers
49 views

Help identifying and getting datasheets for circuit board and LCD

Overall goal: I have a 400 kg mini crane hanging scale that displays the weight on a LCD. I want to add Bluetooth to it so that, in addition to the LCD, the data goes to a phone app or computer. This ...
kmk's user avatar
  • 1
0 votes
2 answers
574 views

How do I know if it's RS232 levels or TTL levels

I have a random device: GT MEDIA V8 Finder Pro. I would like to communicate over its console port. Here are some pictures of its mainboard. Here is the area around the console connector: I have no ...
LimetaPeta's user avatar
0 votes
0 answers
32 views

Need help in populating omitted USB interface component values on an infrared cam

Having this Qunali IR cam which has a USB connector left out at the assembly and comms only via LAN. Probed Data lines, and I got 0.9V fluctuated readings. It seems to send something out there. So ...
Gunay Anach's user avatar
3 votes
0 answers
66 views

Can anyone identify/point me to documentation for a 6-pin SMD device marked as (W?)T2105

I'm troubleshooting an LED workshop light that is malfunctioning and am reverse engineering a schematic to get a better sense of what may be the culprit device. The best I can discern from viewing a ...
delad's user avatar
  • 31
0 votes
0 answers
186 views

Reverse engineering this very common component tester

I'm talking about this common variety of component testers here. Here's my goal: To extend it so it can properly identify MOSFETs & IGBTs even if the threshold voltage is higher than 5V. I was ...
Tempus Nomen's user avatar

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