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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1answer
135 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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0answers
55 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
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 ...
0
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1answer
69 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.
17
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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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0answers
30 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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1answer
412 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....
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0answers
46 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 ...
4
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2answers
90 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 ...
3
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2answers
111 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 ...
0
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1answer
57 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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3answers
164 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 ...
1
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1answer
87 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 ...
0
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2answers
205 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 ...
6
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4answers
4k 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 ...
0
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1answer
272 views

I need help to understand a sniffer circuit schematic

I'm an electrical engineering students and for a school project I need to understand a circuit schematic. First, I will provide some context. The school project I'm working on is the modification of a ...
31
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2answers
11k views

How can I reverse engineer a simple through-hole board?

How can I reverse engineer a simple through-hole board? Trying to do it by eye gets confusing because it's easy to lose track of component orientation and location while flipping the board over. Maybe ...
0
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0answers
50 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 ...
0
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2answers
110 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 ...
0
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0answers
52 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 ...
0
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1answer
263 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 ...
4
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3answers
441 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 ...
0
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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 ...
0
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1answer
111 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 ...
0
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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 ...
1
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1answer
66 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 ...
0
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1answer
137 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
101 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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0answers
584 views

Help identify RJ11 pins on a relay board - No152133

I'm tinkering with my garage door motor (Marantec Comfort 220) which have a RJ11 6-pin connector (X10) for an accessory relay board. The relay board is quite expensive and I don't actually need the ...
3
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0answers
92 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 ...
1
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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 ...
1
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1answer
68 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 ...
4
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2answers
798 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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0answers
86 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 "...
4
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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 ...
2
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6answers
266 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 ...
1
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1answer
438 views

Reverse engineering a high side MOSFET driver SMD circuit board

I am trying to reverse engineer a high side MOSFET driver smd circuit and I have a few components. I am trying to gather data for it. One is a diode with markings ...
5
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1answer
545 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 ...
2
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2answers
206 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) ...
1
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1answer
252 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 ...
2
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2answers
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 ...
0
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1answer
336 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 ...
3
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0answers
49 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 ...
5
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1answer
532 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: ...
0
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0answers
52 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 ...
0
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1answer
51 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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0answers
53 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 ...
2
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0answers
136 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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