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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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47 views

Buliding an Anti-tamper Case and sensors

First of all I'm sorry for my English.I have been working for a while on self-destruction methods.I share methods I found. Basically it's self-destruct when it's tampered.There is no specific device ...
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2answers
74 views

What software use to hack wireless protocol ( logic analyze ) USBee

Q: What software do you use for logic analyze? Why: I try to hack(reverse engineering) my home wireless heating system control to make my own central control unit. Wireless: My heating system uses ...
2
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0answers
87 views

Trying to figure out what kind of input signal this loudspeaker amp circuit needs

I'm still trying to figure out how this door intercom module works. It's a 18y old siedle TLM 611-0 module, I figured out the mic part, there the audio signal is modulated onto the current the mic amp ...
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0answers
40 views

LED-Monitor-Firmware reverse engineering / disassembly => replace manufacturer startup logo

I have a display from a disassembled led-monitor (Wortmann Terra 2446W), that I want to use for a SmartMirror-project. Unfortunately, the monitor shows a big manufacturer logo when connected to power, ...
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1answer
70 views

Can you determine needed input voltage from just looking at this circuitboard?

Question poster's level of knowledge: BEGINNER/NOVICE/MENTALLY CHALLENGED Device: A stage lighting pan/tilt motor, for one axis. Used in sets of two to provide remotely controlled X and Y movement ...
4
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2answers
237 views

What kind of serial communication is this?

I am trying to reverse engineer a serial communication between to microcontrollers (1 device & 1 microcontroller on a board). One MCU validates the other MCU and I want to crack the validation and ...
0
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1answer
89 views

reverse engineering the Nord Lead 4 control board

I am reverse engineering a synthesizer named nord lead 4. I want to tap in between the control board and mainboard which has the microprocessor. i didn’t started with the powered on analysis but i am ...
6
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3answers
661 views

Determining UART RX pin “blind”?

My mom had an old Roku that she no longer wanted so I took it figuring I might be able to hack it and run a generic Linux on it. I took it apart and saw two headers that looked like they might be for ...
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0answers
36 views

Connecting an (Polycom) RJ 9 to Plantronics headphone

Hello I am trying to rewire an RJ-9 phone cable and connect it to headphone jack. I have uploaded the following images to show exactly what i want to do: https://imgur.com/uOt4esa -->I want to know ...
2
votes
1answer
86 views

How to remove Black cooling paste on IC?

I am trying to reverse engineer a product, but I ran into a problem: One IC had a heatspreader on top of it. With a bit of force I could remove it, but I am unable to read what's written on the IC, ...
0
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1answer
78 views

PCB power planes and routing question

Ok this is my first time trying some kind of reverse engineering and I have few experiences in PCB testing so it may be a basic question. Basically I am trying to get the schematics for an 8 channel ...
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2answers
85 views

Help with reverse engineering an LED driving circuit

I am trying to reverse engineer an LED driving circuit. The schematic I generated from analyzing the board looks as follows: The main circuit is this one: https://www.monolithicpower.com/pub/media/...
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0answers
43 views

Identify TI motor driver IC (from old HP printer) or its control protocol

For fun, and as an exercise in reverse engineering junk hardware, I am trying to understand the internals of an HP DeskJet 840c printer from 2001. Specifically I am trying to understand how the motor ...
3
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3answers
154 views

Help Understanding a PCB Circuit from Cordless Hot Glue Gun

I'm trying to understand the circuit in this PCB taken from a cordless hot glue gun. Battery voltage is 18-19v. I've been able to identify most of the components but not all. And most importantly I ...
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votes
1answer
117 views

Voltage convert from 110v to 220v

Should the ceramic heater in soldering iron be changed to convert the iron from 110 volt to 220 volt? What about the Thyristor? I know getting new iron is better, but my question is just for learning....
3
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1answer
123 views

Why 2 zero-crossing detection circuits in heater?

I reverse engineered the power board of an electric heater. I think, I understand most aspects of this circuit. One thing is not entirely clear to me though: The circuit seems to have two distinct ...
1
vote
1answer
195 views

Flashing nordic n51802

I have a Chinese rip-off game pad, which has an n51802 which is by nordic. I want to flash my own firmware but i’m unable to find any information about it. I can put it in DFU mode, so it is flashable,...
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1answer
124 views

Serial Wire Debug (SWD) Enumeration

When debugging or accessing hardware firmware, JTAG and SWD can be really helpful to the developer, engineer or reverse engineer. When looking at an unknown board/device tools such as JTAGEnum or ...
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4answers
2k views

Do PCBs have schematics? [closed]

I have been studying electronics a bit at home in my spair time. I was wondering if manufacturers make schematics for PCBs? If I could get ahold of something like that i feel that I could understand ...
2
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0answers
103 views

Dumping contents of read-protected PIC

I have a need to read out the flash memory of a read-protected PIC16F57 (this is for legal purposes). From my basic research, there appears to be no way of doing this short of decapping it and reading ...
3
votes
1answer
134 views

Reverse engineer a custom (failed) transformer

I am attempting to repair an aged air conditioner I have tracked the issue to a failed secondary on a current transformer. Very helpfully schematics are available for the circuit board and inform me ...
0
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3answers
111 views

Air Purifier Circuit Mod Help [closed]

I have an air purifier I would like to modify the PCB to an always on state at high setting when plugged in. This would allow me to control the device with and Amazon Echo compatible smart plug. ...
-1
votes
1answer
68 views

Reverse engineering to MSP432P401R LaunchPad Development Kit [closed]

I have this LaunchPad Development Kit(MSP432P401R): I connected the kit to the computer using USB (Like in the image), and through the PuTTY software I was able to receive the output and input to the ...
1
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1answer
86 views

How to interpret this CAN bus data and find an equation?

I am trying to reverse engineer the data sent from an old CAN bus data logger. It sends a single ID which is selectable from a dip switch. The only bit of data I am struggling with is the RPM I plan ...
0
votes
1answer
70 views

How to connect LCD backlight wires [closed]

I have bad caps in my LCD monitor. While taking it apart, I disconnected the LCD backlight wires to get to the power supply. I blame bad product design and my own stupidity for not checking how the ...
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0answers
33 views

Trying to identify part driving in magnetic levitator. Maybe a 2.5 V switching regulator?

Its from a toy magnetic levitator purchased on alibaba. I wanted to understand and modify it but the key component has the markings sanded off. I'm pretty sure I got the pins figured out and know how ...
6
votes
1answer
120 views

Identifying component from i2c trace & obscure SMD marking

I wanted to poke around one of those sub-10$ smart bands, so I got a couple of them. I opened it and I was able to identify some major components from the SMD markings, including a Dialog DA14580 MCU, ...
0
votes
1answer
143 views

Help identifying a SOP-18 IC (labels removed) by reverse engineered circuit

I have a SOP-18 IC (0.65mm pin pitch) which I need to identify. It seems the vendor removed the labels on top of the IC, so I need your help. The IC is usually connected to a bunch of LEDs and two ...
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0answers
43 views

Help with assessing maximum operating voltage of a circuit

I am designing a field charger for charging lipo batteries while I am out flying and on the go and I already have a huge 16000mah 4S lipo available that I could use to charge my 1300mah 4S and 2200mah ...
0
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4answers
967 views

Reversing the Direction of An Induction Motor?

I have this motor I salvaged from a dryer, and I'm interested in reversing the direction of spin because it spins in the direction opposite of typical machine threads. The Capacitor is shown at the ...
0
votes
1answer
84 views

Figuring out the protocol of an SPI device without a datasheet

I am pondering about interfacing with the iPad Mini 2 touch panel. It seems that no one has successfully done this and/or published anything about it, so I want to take a stab at it. As far as I ...
4
votes
1answer
287 views

Difficulties reverse engineering a digital bathroom scale

I apologize if this has been discussed elsewhere and for the length of the post. This is a group project and we plan to take the weight value from the scale and send it via a WiFi connection to ...
0
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4answers
156 views

Does modern market has IC chips which can be fully reverse-engineered with optical microscope?

I'm planning a new course on digital electronics and semiconductors devices for my university. I think, it would be great to go to the lowest available level of abstraction, or, at least, slightly ...
4
votes
3answers
531 views

How to reverse engineer controller outputs of a sprinkler control box?

I want to replace the controller of a sprinkler control box with my own design, while keeping the backplane and module(s). The controller has a 14 pin ribbon cable connection to the backplane and 4 ...
2
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0answers
199 views

Reverse Engineering Panasonic AC Remote Control Circuit

I have a Panasonic air conditioner which comes with a wired remote controller CZ - RD513C attched to the wall and has no infrared. I want to make a circuit connecting to STM32F746 to automate the ...
1
vote
2answers
133 views

Decoding a Two-Wire SPI-esque Serial Protocol

I'm working on a project that involves the optical sensor from a mouse. I've got the original control PCB (still populated, save for the optical sensor itself), and I've got the optical sensor on my ...
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0answers
74 views

Reading multiplexed or charlieplexed display, is it possible and how?

What I try to do is reading a 7 pin display with 35/36 segments/LEDS. I want to do this to know what the device is doing. Why? Because I want to know I can do it (it is possible anyway) and to be able ...
2
votes
1answer
177 views

Identify a 320V DC Brushless IC Power MOSFET(?) Driver

I need some help identifying this IC. It comes from a bladeless fan. It is presumably a 230V Power MOSFET(?) element connected to the FCM8201 Three-Phase Sine-Wave BLDC Motor Controller. The thick ...
7
votes
4answers
3k views

Reprogramming a computer mouse's internal IC?

I have a mouse with an internal IC: SPCP168A, having read about it, I discovered that it is specifically designed and programmed for the mouse functionality. I am interested in reprogramming the ...
2
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0answers
75 views

Reverse Engineering a transmitter circuit

This circuit is from a radio transmitter electric gate keyfob. -> http://www.easygates.co.uk/product_info.asp?ProductID=340 I want to make my own keyfob. How would I go about finding or creating a ...
0
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2answers
107 views

Can any part of Intel's (RdRand) random number generator be visually inspected?

A random number instruction RdRand, has been added to Intel's Ivy Bridge processors that (allegedly) draws upon a hardware entropy circuit. The architecture is (allegedly) something like this:- The ...
0
votes
4answers
146 views

How do I figure out the windings of a transformer

I have a transformer. It is a custom wound transformer for a old linear powersupply. As is common, it has two primary windings for supporting 115V and 230V operations (or, 120V and 240V as is now more ...
21
votes
4answers
6k views

Why does a mouse need a crystal?

I was looking at this schematic for an old (pre USB) mouse: when I noticed it had a crystal on it (Y1). I was curious why a mouse would need a timer? Wouldn't it be able to use the clock from the ...
0
votes
1answer
101 views

Replace CR2032 by li-ion reverse engineering

I want to replace my Wireless door bell by lithium-ion 3.3 V-4.2 V but I don't know if the circuit is design for that. It work with CR2032 3 V max. I think I identified Attiny85 on the PCB, I can ...
1
vote
3answers
167 views

Reverse engineering: Relay driver design consideration

While reverse engineering a garden twilight switch I frowned upon the fact that there is no positive feedback for the OPAMP. Rather than that I found a simple top detector D7/C5/R5 to drive the output ...
2
votes
2answers
353 views

Why does my I2C write get NAK'd?

I am trying to interface to an existing device, for which I do not have documentation. The device exposes a 5v I2C interface with several IC's on the bus. I have used a logic analyzer to capture the ...
1
vote
1answer
270 views

What role is this Matched PNP Transistor and MOSFET pair playing in this circuit? [duplicate]

I'm trying to understand what exactly this power circuit is doing. The schematic below shows 5V in from USB. It is run through a fuse, and then there's some tricky PNP transistor stuff happening I can'...
7
votes
2answers
701 views

Why the extra transistors in this current mirror?

I'm trying to understand the unusual current mirror circuit below. The current controlled by R2 is mirrored to R1. The strange feature of this circuit is that Q1's collector and base aren't connected ...
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1answer
358 views

How does this blinking LED circuit work? [duplicate]

I found a circuit that has an led that is blinking in it. I was interested to see how it works so I took it apart and found that there was no capacitors in IC's in it (here is a picture): I think ...
0
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1answer
112 views

Need help finding the datasheet of this IC

I'm trying to find out what this IC is and appreciate any help! It is located inside an EV charging cable and its main task from plugs datasheet is: "STATIC RESISTANCE (FROM PROX. DETECTION TO ...