Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [review]

70 questions
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Design considerations for LED strip PWM dimming

A note on my background: I'm a programmer in an electronic design company, starting out with hobby projects. I'm planning to design a PWM LED strip dimmer and colour controller for an RGB/RGBW led strip (yes, this is a hobby project). Before I start…
jaskij
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Help review my first arduino PCB: What did I do wrong?

EDIT: After taking all what you guys said into account, I edited the pcb into the following. Changed the FTDI while breaking the ground loops and working on the traces a bit, changed the size of the 100uF capacitor and hopefully the new routing is…
haidar elie
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5
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1 answer

Microcontroller output override another signal, protect uC when powered off

I have a digital signal from somewhere else and a microcontroller. The microctontroller can set it's output pins to be high, low, or high-Z. If the uC pin is high or low, I'd like the output to match it. If the uC pin is high-Z I would like the…
Jack B
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5
votes
4 answers

555 timer frequency is way off

I'm currently designing a 555 timer to provide a 38kHz square wave to drive an IR LED as part of a beam interrupt detection system. This beam interrupt is a part of an embedded product where we cannot easily modify the existing processor software,…
Chris Fernandez
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5
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2 answers

Circuit for choosing one power supply from several of them

I have a load and four different voltage sources. I want to change the voltage on the load by using four different enable signal as seen in the schematic below. Note that, all of the "Enable" signals are active low, and only one of the enables can…
hkBattousai
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4
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3 answers

PCB Review / Signal Return Path

I'm trying to design better PCB layouts and as for now only work with 2 layers boards. My question is about the signal return path on this PCB, is the design in the "right" path or I'm doing something wrong? Any feedback will be appreciated. Thank…
ianlydae
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4
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Ethernet layout review: avoid vias or avoid copper under transformer?

I am designing a PCB that needs two adjacent Ethernet ports, both at 1Gbps speed. The first Ethernet port (J5) is broken out directly from the processor module (Raspberry Pi Compute Module 4). The second Ethernet port (J6) is provided by an Intel…
Chris Fernandez
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4
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3 answers

Better Gerber Review Tools

As part of my current workflow producing a PCB layout I open my gerber files using gerbv. This allows me to switch on and off layers and check things are as they should be. However I need to present the layout to some others in my team, preferably…
Hugoagogo
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3
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Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)

I'm looking for feedback and improvements on my design below. Specific questions are at the end. I created this as an attempt to answer my own, previous question. From my feedback there, it seems like I needed to be more clear in my…
jakekarnes42
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2
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2 answers

Solid state relay output connection: Is there a difference between high-side and low-side switch configurations?

I am planning to use this SSR chip. I decided to use the "Connection C" configuration which is given pictured in the 2nd page of the datasheet. However, there is something I don't like about this connection, and that is that the load is connected…
hkBattousai
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PCB design review request: ESP32 as LED strip controller

I'm trying to create my very first PCB and before wasting my money on ordering non-functional PCB, I'd like to ask your advice. Background: I have WS2815 LED strip, controlled by ESP32 which uses two touch buttons as an On/Off/ChangeMode signal…
Oleg Butrimov
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4 answers

PCB design review (ATMEGA32U4)

I have been trying to make a watch for the past few months, but all my prototypes have been unsuccessful. So, to try ironing out some problems, I made a practice PCB to try testing my base Atmega32u4 system. It has a CR2032 battery with a boost…
user29946
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3 answers

FT2232H on custom PCB not recognized by PC

I am using a FT2232H on a custom PCB and I cannot get it to be recognized either by Windows or by FT_Prog. Images of the schematic are attached. I have probed all the power pins and they read the expected voltage (either 3V3 or 1V8). I can see the…
N. D. Smith
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Please can someone give their opinion on my Cat water Dispenser circuit?

I'm trying to create an automatic water pump for my dear old pussy cat (I'm using her as an excuse, really I wanted a project of some sort) I have the following Circuit: R1 is the water itself S1 is the water being conductive and completing the…
Chris Robertson
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1 answer

68008 Main board Review

I'm building a retro computer around the 68008 CPU The main board will be simple, The CPU, 1MB of RAM, and a 32kB ROM (Bios/boot rom) here is the adress map $000000 - $07FFFF : RAM0 $080000 - $0FFFFF : RAM1 $3F8000 - $FFFFFF : ROM The rest of the…
Jeremy Talus
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