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

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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 ...
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1answer
28 views

Reverse engineering Oculus Rift S TRRS audio output [closed]

I'm updating this post as I read more and my understanding evolves. I have a TRRS connector which seems to carry stereo audio with a ground for each channel. I want to hook it to a TRS connector with ...
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103 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 ...
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51 views

Understanding a power switch circuit that includes Schottky diodes at its input

In the following design, I couldn't find the datasheet for the part U25. All I could find from Orcad that chip part name is: G5027C. Anyway, I don't have contact with the person who created this ...
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133 views

Does this electronic organiser have UART? [closed]

This is a question about finding the UART, or whatever alternative, so I can get access to an old electronic organiser from the year 2000. I know this is a hardware question, but it is technically ...
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1answer
40 views

What serial protocol has 60hrz cycles?

I'm tapping the ribbon cable interface between a HVAC control board (relays, etc) and display board (membrane panel + led display) to reverse engineer how to change the set point programmatically. I ...
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1answer
87 views

Purpose of this IC in USB 3.0 Hub

I'm trying to design my own USB 3.0 hub based on this commercial design, I can understand everything in this design except the usage of IC "ASM1543". Unfortunately there is no datasheet ...
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1answer
87 views

Can the motherboard of a inkjet printer be reprogrammed to do something else? [closed]

The motherboard of an inkjet printer has some useful functions - controlling position of the printhead, it has axis movement etc., which a plotter would need. Is there any way to reprogram the ICs to ...
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63 views

Unsure of the role of these transistors while reverse engineering a keypad PCB

I am trying to reverse engineer this PCB from a keypad to use it with an Arduino, but my transistor based knowledge is a bit lacking. I have gotten this far with regards to the architecture of the ...
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1answer
90 views

Reverse-engineer pinout of capacitive touchscreen

I'm interested in reusing the capacitive touchscreen of my old iPad. (As a learning experience -- I'm aware that this project will cost me more than just buying a new capacitive touchscreen would.) ...
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91 views

Which differential protocol to use when redriving Ethernet?

I want to redrive a 100-BaseTX signal on a board. The signal is to be redriven 3 times (by the same setup). On one end is a STM32 NUCLEO-F767ZI board, and on the other end is a GbE switch including ...
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2answers
75 views

Need help with IR Transmitter circuit

I'm trying to understand the working of IR transmitter circuit. But R77 feedback resistor creating confusion about its working. I know it's acting as a current limiter to the LEDs but confused about ...
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1answer
81 views

Mystery SOT-143 Part on Magnetometer

I'm trying to understand the operation of a single coil magnetometer (marketed as "fluxgate", but with only a single coil). I've backed out the schematic as shown. The coil is driven by a ...
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86 views

Need help with an IR demodulation circuit

I'm trying to reverse engineer a PCB and made a schematic. The bad thing is I only have PCB images from both sides, not the actual PCB. This PCB is used to detect a very small black object spinning at ...
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1answer
42 views

Unknown pads on board

I'm analyzing a board for some device (game handheld console). I've found a simple SPI flash on it (W25Q) but there are 2 pads exposed for what I assume is factory testing (there are no other pads ...
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1answer
59 views

Some segments not working on 7 segment multi led digital clock

I have this old homemade digital clock which i'm trying to revive. It has sentimental value as it was built by my dad in his youth. The problem is 2 of the segments only sometimes light up on the ...
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80 views

UART - Logic Analyser

So I've been working on getting UART access to the head unit in my car; I've got the schematics of the unit and found that TX3/RX3 on the Renesas SH7750 are presented externally - along with 3 "...
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3k views

What is this IC Chip on this circuit board?

Very new to electronics outside base knowledge. This board is from a small smartphone toy, where pressing and holding the button displays 1 color on an attached RGB LED and quickly double tapping the ...
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2answers
412 views

Capacitive moisture sensor not quite working

I have spent the past few days trying to reverse engineer a capacitive moisture sensor I ordered from eBay a while ago. The particular one I received looks like this: What fascinated me about this ...
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6answers
189 views

10Ω series resistor in output of headphones amplifier

I managed to reverse engineer a headphone amplifier in a USB DAC that I bought on aliexpress. As I expected there is a electrolytic capacitor in series to the output, but there is also a 10Ω resistor ...
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3answers
107 views

Zener Diodes with low forward voltage drop

I've designed a number of boards which utilise different kinds of diodes, and thought I had a good handle on how they work and their properties - however recently on doing some reverse engineering ...
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2answers
174 views

How to identify an unknown protocol with a logic analyzer?

I have this Inbras electrolyte analyzer, a rebranded version of the same device manufactured by Diestro. It uses a PIC18F87K22 (master) which communicates with the sensor using a PIC12F629 (slave) ...
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298 views

How can I “listen” to the activity across a wire? [closed]

First of all, apologies if this is a noobish question; I'm a tinkerer with no engineering background. I bought a device with two buttons on it. After taking it apart, I saw that these are connected to ...
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Disk array power supply pinout/conversion

Sorry for crossposting this, but I've had no answers from the more specific Ggroups. I'm in the process repurposing a power supply from a scrapped Sun Microsystems StorEdge D2 array which was working ...
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1answer
526 views

Trying to identify this potentiometer marked “B5K”

I'm trying to identify this potentiometer as accurately as possible: On the rear it says: B5K. It has two rows of 3 pins each: ...
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46 views

microSD card voltage level- reverse engineering design

Goal: Adding (back) a microSD socket to a camera that does not have one. The microSD pads are laid out and appear to be fully connected. Ground is to the ground plane, the data lines are with ...
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1answer
63 views

Is it possible to hack/edit a camera's software to add custom features? [closed]

I am not a programmer but I am curious if it's possible to hack my Canon camera to be able to work in sync with a custom gimbal that I'm thinking of building. I want to add an object tracking feature ...
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48 views

What is the proximity sensor of the Iphone 11 pro/Max?

I am currently working on an engineering analysis of the latest iPhone 11 pro. Sadly I can not find any information source that can confirm the exact supplier's name for the proximity sensor, since ...
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1answer
47 views

Making available KR512PS10 datasheet

I recently posted a question asking for information on the Russian divider IC KR512PS10 (as transliterated from Cyrillic), but nobody appeared to know anything about the device. I have now measured ...
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6answers
8k views

What are these four pin components labeled LB-4 on a motor control circuit from 1979?

This board performs the speed control logic for a 3 HP shunt-wound DC motor driver in a CNC mill built in 1979. The spindle turned on intermittently last week and then stopped working, so I'm reverse ...
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57 views

Audio amp IC: how does this output stage work?

I'm looking at an audio amplifier integrated circuit and the output stage seems a bit unusual. Has anyone seen this style of output stage, and does it have a name? And can anyone fill in the details ...
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2answers
81 views

Decipher Serial Port communication log of microcontroller

I have an old robot (named qu-bot) that I had used in a school project. A few days ago, I began taking interest in Arduino. On closer inspection, I found that the old robot contains the ATMEGA16 chip. ...
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64 views

What are these mobile pixels?

I've got this picture under my microscope for an old Samsung Galaxy Ace mobile phone, I'd like to know what are the different pixels in the rows with a separation in the subpixels? And how are they ...
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1answer
84 views

How to reverse-engineer/find datasheet for an IC

I have an integrated circuit in the form as a DIN chip, and I have no clue what it is. I have tried searching for the markings on the chip, which are as follows: Top: HDJ2100-393 937GA1925463B2WW ...
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1answer
92 views

Purpose of inverted channel for UART bus communication

I'd like to understand the purpose of an inverted logic channel on device-to-device communication that is being done via UART. For some background - I'm trying to reverse engineer this device-to-...
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1answer
79 views

Reverse engineering of logic board

I'm trying to do some reverse engineering and want to know if there is a way to reprogram the controllers of a board like this one. I know usually the manufacturers have some pins on the boards ...
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1answer
74 views

How to test a cmos sensor without breaking it?

A couple of weeks ago my dad gave me a Syma X5C H5C camera that he found. I wanted a camera for my robot project and I tried to just take the camera but I found a ...
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1answer
95 views

What kind of serial encoding is this?

I'm involved in some reverse engineering of a device I need to interface with. With what little I know, and being able to capture a single data transmission, I think I've narrowed down the encoding ...
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146 views

Reverse Engineering a Tamura Inverter Board

This is about the pin-out of 9-pin connector 1 of inverter board Tamura HBL-0291, part of a Toshiba Tecra M2 laptop from the early 2000s (see images). The controller chip on the inverter board is ...
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16 views

Protocol debug for AMS [Asset Management System] bar module

i've buyed one of this Raritan AMS tag management bar for Datacenter and i want to control it with a commercial micro like Arduino or ESP32/8266 (instead the proprietary controller hardware), now i've ...
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1answer
98 views

Diode on crystal radio in odd place?

I'm trying to understand these earings from ebay. Here is my attempt to reverse engineer the schematic: If this is correct, I don't understand the function of the diode. If the diode is for ...
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88 views

Key fob receiver reverse engineering: IC identification

I'm doing reverse engineering on a hardware of an equipment, this equipment is able to identify the presence of a RF signal from a key fob. Unfortunately, it was not possible to identify the ...
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1answer
504 views

DRM'd hand sanitizer dispenser [closed]

We have a newborn and rely on hand sanitizer when changing diapers, and we ran out at an inopportune moment in history. By some stroke of luck, I managed to snag one of those "industrial" touchless ...
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88 views

How to parse this protocol with an arduino?

I'm analyzing a signal from my building's intercom system to my tenant station. Intercom has two wires, +24V/0.27ma, and ground. Every 10 seconds, the system sends a "heartbeat" signal to the tenant ...
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1answer
221 views

old tachometer rectifier(?) components

First time-poster. Grateful for the site. I'm trying to reverse engineer the intermediate circuitry of a 1960s vintage marine tachometer made by a now defunct firm called Airguide. Airguide referred ...
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49 views

ft24c02a EEPROM Raspberry Pi I2C issues reading

I have a digital scale that I am trying to take apart and feed the weight into a raspberry Pi. The digital scale has a FT24C02A EEPROM that is I2C enabled. I am guessing that the weight is calculated ...
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1answer
85 views

Identify amplifier or transistor

I am trying to repair a PCB that controls a camping fridge, in the process of reverse engineering the circuit I have got stuck at the device in the top left of the below photo marked K17h I believe ...
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2answers
75 views

Is there any research for chemical/structural method to prevent observing beneath chip packaging? [closed]

I want to prevent others from reverse-engineering the on-die ROM, using X-ray, microscope, etc.. I think it's best to inject some substance between chip and packag and when the chip package is ...
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74 views

Need help identifying unnamed micro-controller

The chip I want to identify is a micro-controller with RSA cryptography acceleration utilized in a USB module. I suspect it is a chip manufactured by Chinese manufacturer and it might not be a general ...
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1answer
73 views

Understanding inputs and outputs on a multiplexer chip

I'm trying to understand the chip selects for some hardware I'm reverse engineering. There are more devices than CPU chip select lines so they are multiplexed using a variety of other inputs, ...

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