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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68 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 ...
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56 views

Full-wave rectifier circuit with non-grounded center tap

I'm troubleshooting a full-wave rectifier power supply circuit and have come across something I've not seen before and I'm not quite sure how it works. The center tap of the transformer is grounded ...
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1answer
88 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 ...
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1answer
71 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.
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1answer
59 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 ...
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6answers
3k 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 ...
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38 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 ...
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49 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 ...
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2answers
118 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 ...
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1answer
58 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 ...
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1answer
93 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 ...
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0answers
51 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 ...
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2answers
114 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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53 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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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
126 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
93 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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1answer
68 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
166 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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0answers
106 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
92 views

Need help with IR Transmitter circuit

I'm working on 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 its role in feedback. Can ...
4
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1answer
136 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 ...
3
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1answer
106 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
74 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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89 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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4answers
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
966 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
304 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
179 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
223 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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2answers
300 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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0answers
50 views

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
540 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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54 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
65 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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1answer
52 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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0answers
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
82 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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65 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
105 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
114 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
88 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
94 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
107 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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0answers
194 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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1answer
109 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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96 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 ...
5
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1answer
552 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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