Questions tagged [review]

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0answers
59 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 ...
3
votes
0answers
35 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 ...
1
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0answers
79 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 ...
5
votes
3answers
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 ...
4
votes
2answers
107 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 ...
1
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1answer
305 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 ...
0
votes
1answer
171 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 ...
2
votes
3answers
161 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 ...
2
votes
1answer
118 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 - $...
0
votes
3answers
124 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 ...
0
votes
2answers
105 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 ...
1
vote
1answer
412 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 ...
0
votes
1answer
885 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 ...
0
votes
2answers
266 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 ...
2
votes
1answer
93 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 ...
6
votes
1answer
422 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 ...
2
votes
1answer
2k 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 ...
0
votes
0answers
121 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 ...
0
votes
0answers
48 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, ...
2
votes
3answers
1k 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 ...
6
votes
2answers
3k 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 ...
0
votes
1answer
393 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....
0
votes
0answers
43 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 ...
1
vote
0answers
339 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 ...
2
votes
1answer
127 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 ...
1
vote
2answers
246 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=...
-3
votes
2answers
120 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 ...
4
votes
3answers
584 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 ...
1
vote
4answers
2k 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 ...