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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Identify IC name [closed]

I am reverse engineering a board.Can anyone help me identify real name of this IC?
Zunuran Nasrullah's user avatar
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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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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
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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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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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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
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108 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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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
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634 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
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2 answers
109 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
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2 answers
184 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
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2 answers
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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
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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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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
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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
129 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
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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
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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
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1 answer
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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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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
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1 answer
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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
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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
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2 answers
85 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
173 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
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125 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
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1 answer
129 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
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0 answers
103 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
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1 vote
2 answers
103 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
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1 answer
70 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
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2 answers
224 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
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2 answers
298 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
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0 answers
101 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
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1 vote
0 answers
66 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
524 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
54 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
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0 answers
46 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
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0 votes
2 answers
350 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
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0 answers
28 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
63 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
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0 answers
162 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
1 vote
1 answer
138 views

Best desoldering technique for reverse engineering, or maybe UART

So I'm trying to play with an EPS motor. I was able to get it to this stage while still functioning (can bus still alive and motor spins), but I want to see what processor is uses and see if I can ...
royjr's user avatar
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1 vote
1 answer
77 views

Possible purpose for a resistor and diode in parallel on a short transmission line to a digital input?

During some reverse engineering, I've come across circuits similar to this one shown, where a diode and a rather large resistor (mega-ohms) are in parallel across the source of a signal. Here, when ...
BobaJFET's user avatar
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7 votes
3 answers
1k views

How does the switch in this board control four different states in the LED? [closed]

I have the simplest board with a LED and a switch, powered by 2 CR2032 3V (pictures attached). There is 4 possible states: LED is off. LED flashing slowly. LED flashing fast. LED is constantly on. ...
olegzhermal's user avatar
3 votes
1 answer
93 views

Measuring / estimating unknown common mode choke and transformer

Out of curiosity and to improve my reverse-engineering skills, I'm currently reverse engineering a rather simple 12V switch-mode power supply adapter. Most of the markings and the topologies are fine, ...
polemon's user avatar
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1 vote
0 answers
22 views

Reconciling phase shift error of length-tuned structures in 81-86GHz I/Q direct down-converter ASIC with datasheet specifications

I'm watching a video on reverse engineering a GaAs 81-86GHz I/Q down-converter ASIC. The relevant section of the video for this question is 10 minutes onwards, but watching the video isn't necessary ...
Polynomial's user avatar
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3 votes
1 answer
214 views

Signal identification: What serial protocol does my desk use?

Can anybody identify what kind of signalling protocol this is? I'm sampling at 2 MHz. Here's the first falling edge of the signal, with a default UART protocol decoder for reference (8 bits, no parity,...
Alexander's user avatar
  • 260
2 votes
1 answer
110 views

What is this circuit in motion detectors?

I have used several off-the-shelf mains voltage motion detectors over the last couple of months. Different makes and models. This kind of thing: Often I have the issue that when they are off, they ...
AndreKR's user avatar
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1 vote
0 answers
74 views

How to drive base of an NPN with a reverse-connected diode?

The circuit schematic belongs to controller board of a some kind of heater device. I reverse engineered it from the board itself and checked it three times. Its function is so simple: You adjust ...
kemal's user avatar
  • 95
9 votes
2 answers
2k views

What protocol is this waveform?

I'm trying to reverse engineer a communication line between two components. However for debugging I'm connecting to only one of them, powering it up and looking at the signal. I have no experience ...
AntoineG's user avatar
  • 191
0 votes
2 answers
205 views

Can 12V/9V DC source be used for Christmas Disco Light instead of 220V AC?

the Christmas disco lights up on 220V AC supply. Now, can I used 12V/9V DC at the points A and B (picture attached)? And, will the lights work as before in AC source supply? If not, please enlighten ...
Nar T's user avatar
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