Questions tagged [review]

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Replace transistor-latch with thyristor: is my circuit correct?

Please consider the following two circuits: On the left, is a transistor-latch using a PNP and an NPN transistor. I'd like to replace those two transistors with a thyristor, mainly to get a little ...
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  • 925
0 votes
1 answer
148 views

Schematic Review for STM32 basic development board

Could anyone look over the schematic design for this STM32 bluepill style board and check if everything is correct? I'm unsure if I wired everything correctly or if I'm missing anything important. ...
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2 answers
55 views

LiSOCl2 battery EOL monitor review

I'm working with a device which will use Lithium thionyl chloride (non-rechargeable) batteries as a backup source; their discharge curve is quite flat and AFAIK you can't tell how is the battery in ...
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2 votes
2 answers
298 views

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 ...
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  • 13.5k
1 vote
1 answer
236 views

Design review request : Mains / low-voltage PCB design

I am creating a radiator controller by pilot wire (in France) for domestic and personal use. The general idea is that using the 230V AC (standard) and modifying it with full, half or no wave you set ...
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  • 131
2 votes
2 answers
266 views

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 ...
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0 votes
1 answer
91 views

Did I design the decoupling and power setup right?

I am building a self-playing piano project with 88 solenoids and sustain control. I use 11 daisy-chained shift-registers which are connected to an Arduino and controlled using SPI. The latch will be ...
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0 votes
3 answers
152 views

Help a beginner understand if a design is correct

I'm fairly familiar with Ohm's law and I did some calculations I'd like experienced engineers to confirm if it is correct or point where I made a mistake Here's the idea I want to power a self-made ...
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2 votes
4 answers
521 views

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 ...
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0 votes
1 answer
53 views

Inverting SMPS - tantalum and part selection | Monolithic controller getting hot

I'm designing a circuit to provide a negative voltage rail in a battery for an ADC. I've decided to use a particular monolithic BCD Chip that can work as a step up/down/inverting controller and has an ...
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0 answers
45 views

Connector pinout review

I am designing a system around a bus using DIN 41612 connectors. I have come up with the following pinout for my connector taking into account the following requirements : Each signal pin should have ...
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1 vote
0 answers
486 views

Schematic review: STM32 Bluetooth antenna

I am working on a device based on the STM32WB55xx line of microcontrollers. In the latest revision of the PCB, I altered the antenna filter and chip antenna components to better match the device ...
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0 votes
2 answers
100 views

PCB Review - LM5164

What you guys think about my LM5164 power board? Tried to copy the demo board version, 15-100Vin - 12Vout@1A.
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2 votes
3 answers
601 views

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 ...
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1 vote
2 answers
66 views

Design review for photoresistor-controlled linear regulator

I would appreciate some comments/insights/criticism on my design: I want to turn on/off a linear regulator (MIC5504) based on the light. I have tried just using a resistor and photoresistor voltage ...
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1 vote
0 answers
177 views

ESP32 with JGY-371 stepper motor and L293D

I'm currently trying to make an automatic chicken coop door, I plan to use an ESP32 with an L293D motor driver and JGY-371 geared motor 30RPM (shop link). The door should not exceed 1kg and should ...
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1 vote
0 answers
45 views

Need a review on my first schematic. A 3-speed mode blowers schematics

I am currently on my own project building a blower that can be controlled using a switch with 2-3 speed mode powered by 12V Li-Ion Battery with hope this can support local health workers. However, I ...
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0 votes
1 answer
164 views

ATMEGA328P development board

I'm planning to make an ATMEGA328P development board. I'm new to electronics. Schematic is shown in the image. Please let me know it is correct or not, and please let me know if any changes or ...
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0 votes
1 answer
455 views

Review of PCB design: ESP32 + 2 Relay design review

I've completed the design of my pool timer that can turn the pump & light on/off via Wifi and would love to get my design reviewed. At 120V; the pool light should handle 500W and the pump is a 0....
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1 vote
0 answers
80 views

Pull-ups in a mixed voltage environment

I'm working on a circuit where a 12 VDC line is switched from a USB-powered microcontroller (U1, running at 3.3 V, specs below). I want to ensure that the switch ...
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  • 1,306
4 votes
1 answer
174 views

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 ...
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  • 12k
1 vote
0 answers
99 views

Circuit review: Switch/monitor 12V devices using a USB-connected microcontroller

I've designed a board to allow my desktop computer to switch external USB hard drives on and off. I don't have a huge amount of experience with circuits like this one so I'd like to get some feedback ...
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  • 1,306
4 votes
4 answers
2k views

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 ...
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4 votes
2 answers
268 views

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 ...
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  • 13.5k
1 vote
1 answer
1k views

SMPS feedback circuit with voltage regulation and current limiting

i’m self learning electronics for a few months now and i choose my first project to be a bench SMPS. Since it is my first circuit design ever i really need some clarification. My SMPS is 2-switch ...
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0 votes
1 answer
667 views

Controlling 12V water pump with NodeMCU – circuit design review

I'm a programmer who's recently become fascinated by electronics, specifically with microcontrollers and how I could use them for various IoT projects. For a starting pet project, I'm planning to ...
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2 votes
3 answers
176 views

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 ...
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2 votes
1 answer
153 views

68008 Main board Review [closed]

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 - $...
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2 votes
3 answers
502 views

Changing output voltage of a buck converter by electronically swapping the feedback resistors

I am going to design a circuit which is going to output some digital signals. The output stage of the circuit will have some level shifters. The level shifters will give flexibility to the user to ...
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  • 13.5k
0 votes
2 answers
116 views

Trouble with engineering project - 555 timers

I'm currently finishing my GCSE engineering project and I am attempting to use a dual 555 timer circuit as a timer. I am using a schematic I copied off Kitronik Alarm Project Kit, but when simulating ...
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  • 3
1 vote
1 answer
1k views

Switching high voltages with MOSFET at high frequencies

I need to rectify 220V 50Hz AC power to obtain 48V DC output voltage. Up to 40A current can be drawn from the DC side. 10% ripple is acceptable on the rectified voltage. I am considering two ...
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  • 13.5k
0 votes
1 answer
2k views

Review of PCB design L298n

I'm decided to finally make my motor driver boards but I'd be happy to have some feedback as it's my first PCB design. It's mostly based on the datasheet of the l298n chip. So there is nothing much ...
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0 votes
2 answers
497 views

7 Segment display driver

I came up with the circuit below to drive a single 7-segment display from an Arduino via a shift register (74LS595). Is the circuit correct/good enough or am I perhaps missing something critical in ...
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  • 103
2 votes
1 answer
109 views

I created a textbook supplement for Electric Circuits. Am I missing anything critical? [closed]

Please note I have tried my best to follow the rules of posting and this post follows them as far as I know, thank you. **Edit: ** The course covers the following sections: Circuit Variables Circuit ...
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6 votes
1 answer
447 views

Help review my first arduino PCB: What did I do wrong? [closed]

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 ...
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3 votes
1 answer
3k views

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 ...
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0 votes
0 answers
124 views

Schematic review of power supply

Would you be so kind to point out any errors in this schematic or anything else to improve (layout and clarity also greatly appreciated). This is supposed to be the power/regulating/batterycutoff ...
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  • 27
0 votes
0 answers
51 views

Grouping SUPPLY in Eagle

I'm designing my first schematic in Eagle, with the aim of getting some PCBs produced. Been perfboarding for a while, but new to using Eagle. I've designed a schematic: I know it's kind of messy, ...
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  • 654
2 votes
3 answers
2k views

Check my first PCB design for errors (simple high power LED circuit)

I'm designing my first PCB in Eagle. This PCB is for surface mount LEDs (Epistar 1-3W) and has 5 independent channels. There is an input from my driver circuit and an output for daisy-chaining more ...
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  • 45
8 votes
2 answers
4k views

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 ...
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  • 1,063
0 votes
1 answer
474 views

PCB Design - Simple USB Radio Transceiver [closed]

I'm designing a small USB radio transceiver with 3 main components: Sparkfun's RFM69HCW 915 MHz Transceiver. [Datasheet] Microchip's MCP2210 USB-SPI Bridge. [Datasheet] A simple USB port from Digikey....
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  • 287
0 votes
0 answers
65 views

Controlling 2 PSUs with an mCU

I'm finalizing my plans to make a physical control panel to interface 2 of my 3D Printers to an embedded Linux device. (Just minimal physical controls since 95% of the controlling will be done via a ...
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  • 217
1 vote
0 answers
486 views

Is this a well-implemented power supply for driving logic from a LiPo or NiMH battery?

I'm designing a power supply for a system which requires a 3.3V logic power rail, driven by a user-selected battery. My requirements are as follows: Input voltage between 7V and 18V - usual ...
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  • 6,677
2 votes
1 answer
136 views

simple circuit review

I'm building a DIY project with a Rapberry Pi. I tried to cut down the connections to the ones I think might be involved in a certain behavior I'd like to understand. What I have: a 12V power supply ...
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  • 147
1 vote
2 answers
264 views

Is my PCB good?

I's my first time designing a PCB board and I would like to have your professional inputs and know if I made any major design error. The design is available here : https://easyeda.com/editor#id=...
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-3 votes
2 answers
154 views

Is there anything wrong with this circuit? [closed]

I'm hoping for a review of this circuit. I'm looking to make a little IoT device thats powered of a USB mini port or from Vin. There is the MCU, a few sensors, a GPS unit and a RF module. Any ...
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  • 446
4 votes
3 answers
776 views

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 ...
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  • 2,285
1 vote
4 answers
3k views

Critique for my short circuit indicator and guidance to improve it

This circuit was designed to save electronic components in the assembled board from damage. It gives warning beep if there is a short circuit in the assembled board. Thus it helps to switch off the ...
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  • 1,537