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Considerations in board layout for different interface speeds

Currently, I'm working on a design that includes four data buses operating at different datarates. The signals connect various parts of the system to the central FPGA. I have experience in designing ...
ElectronicsStudent's user avatar
3 votes
1 answer
61 views

Less than minimum charge voltage for NiMH battery and extra parts in a "simple" circuit

I was given the job of duplicating a "simple" box that monitors air flow in a duct. It seemed simple. I dabble in electronics (I design and build industrial control panels, starts, PLCs, HMI,...
xtal_01's user avatar
  • 33
0 votes
1 answer
35 views

Pulling Receiver Enable Low for RS-485 Transceiver is being transmitted as a byte in Modbus packet

I am running into an issue where pulling RE low on my Max3441EESA is appearing as an extra byte in my Modbus message. I am currently testing the Modbus capability of my PIC32 MCU with a Modbus slave ...
SubjectFocused's user avatar
1 vote
0 answers
23 views

How to consistently read two counter registers across PDEC and TCC on SAMD51

I am using the PDEC on a SAMD51 to read a quadrature encoder from a closed loop stepper motor which has 4000 encoder increments per rotation. The PDEC counter is only 16 bits wide, which would ...
Scott Duckworth's user avatar
1 vote
2 answers
78 views

Master-Slave JK Flip Flop Truth Table

In my computer logic and design class, we have gone over the different types of flip flops and their representations. I understand what the goal of the master-slave configuration is but I am having ...
Tony Martini's user avatar
0 votes
0 answers
43 views

Lvds to hdmi convert [closed]

I want to convert a LVDS signal to HDMI bur I can't find the right converter for it. As my screen car is broken I have another one 10.1 inch that I want to fit but the signal input is only in micro ...
Erion Mataj's user avatar
2 votes
2 answers
51 views

Pull up or pull down resistor for potentially unused inverter input?

I'm using this TI Inverter that mandates that the unused inputs never float. Sometimes, the inputs will NOT be used, and other times, all 6 will be used. As such, it seems like I should use a pull up/...
Rydberg's user avatar
  • 253
0 votes
0 answers
53 views

IV curve arithmetic - reference request

When playing around with electrical concepts in my head, I realized that the IV characteristic of any combination of elements, in series or in parallel, can be computed by simply adding the IV curves ...
KKZiomek's user avatar
  • 121
2 votes
2 answers
54 views

How to handle varying chip voltages on an I2C line?

I am working on a design where I have various chips that operate at different voltages that I am trying to put on one I2C bus. Normally I'd just pick different chips that accomplish the same goal with ...
Sal's user avatar
  • 21
1 vote
2 answers
82 views

Should two different DC power supply GNDs be connected to each other on a PCB?

I'm making a small project that drives a few DC motors with H-bridges. +12V DC will come from one DC power supply (regulated to 10V for motors,) and then +5V will come from another (different) DC ...
Rydberg's user avatar
  • 253
0 votes
1 answer
64 views

Problem with the output of a synchronous non-inverting buck-boost converter

I found this electronic circuit in an old research, along with the code necessary to operate it. When I applied it in the laboratory, the results were not the same as in the original research, not ...
loa rifa's user avatar
1 vote
1 answer
60 views

Earthing: TN in TT installation?

Something odd happened at work today: the whole building installation is TT, just like the whole country. L1-L2-L3 supplied to the transformer and then L1-L2-L3-N goes to the loads. I noticed that we ...
scan's user avatar
  • 11
3 votes
1 answer
669 views

Will capacitors that are connected between GND and Vcc to a CPU impact the capacitance between the same pins on other components?

I am working on a pcb that has to have a CPU with capacitors between its gnd and vcc pins, other components like sensors also have to have capacitors connected to them for whatever reason indicated ...
maths soso's user avatar
0 votes
1 answer
68 views

Reverse engineering an printer rotary encoder [closed]

I'm trying to make an diy steering wheel and I have an encoder (I know the pinout). Will it be ok for this? https://es.aliexpress.com/item/1005002435277981.html
Leswar's user avatar
  • 1
0 votes
0 answers
53 views

Unexpected behaviour in VHDL circuit

I want to simulate the following electronic circuit in VHDL: And here is my implementation: ...
Álvaro Rodrigo's user avatar
0 votes
2 answers
70 views

Confused about how to wire headphone jack with a schematic

I've been trying to make an LED driver that responds to a signal sent over an audio cable and found this schematic: I'm pretty sure that the middle ring on the jack and socket (third contact) is the ...
captainretro's user avatar
0 votes
1 answer
46 views

Non-inverting driver for LED

I am looking for a non-inverting LED driver. The main idea is to connect 20 x LEDs (4 series of 5 LEDs each) to 12V source (car battery: car is running so there will be some interferences -> I use ...
SkePsis's user avatar
  • 65
0 votes
2 answers
87 views

Pulling pin low through PNP BJT?

I'm using a battery charger/buck regulator IC that turns on if the pin named "shphld" is momentarily pulled low, and turns off if the pin named "shpact" is momentarily pulled high. ...
FloydPage's user avatar
1 vote
0 answers
67 views

Circuit diagram potential issue and help regarding debugging

I'm an EE student in my first year, and for my LCA project, we had to buy components and attach all the components of any circuit from the internet. I found one and I've verified my connections many ...
redline125's user avatar
0 votes
0 answers
63 views

How can I compare these two frequencies?

I want to make a metal detector using an STM32F103C8T6. I want to compare the PWM signal from the STM32 to the search coil's signal. When the search coil's signal is higher or lower than the STM32 ...
VU Work's user avatar
1 vote
3 answers
56 views

Inverting opamp amplifier: frequency response not compatible with LTspice simulation

I have a simple inverting opamp amplifier and I want to study the frequency response of the circuit and finally calculate the frequency band (or cutoff frequency). Unfortunately the model created in ...
Gabriele's user avatar
5 votes
2 answers
424 views

Buck Converter - Coss Loss

From: https://fscdn.rohm.com/en/products/databook/applinote/ic/power/switching_regulator/buck_converter_efficiency_app-e.pdf Can someone explain why the high-side MOSFET causes a loss due to its C_OSS....
muosac's user avatar
  • 75
0 votes
0 answers
32 views

Driving Gate from MCU (using 6N136 and TC4431)

This is my first time trying to use this optocoupler (6N136) I'm trying to control a MOSFET gate with the least switching delays (rise and fall timings) possible, while making the MCU isolated from ...
Bikay's user avatar
  • 37
2 votes
1 answer
24 views

Earth for custom POE+ board design

after getting the center tap pins for poe, I have an example schematic to design an EARTH ground. I have the understanding that that would be our Earth in AC over cabinet. That would remove our value ...
Wes Ellgass's user avatar
0 votes
0 answers
52 views

How to find computing SoMs [closed]

I'm currently redesigning the electronics of our robot, and I'm planing to replace the outdated [Jetson Tx2][1] (a system on module (SoM), mainly consisting in a processor and RAM). Usually, when ...
Sandro's user avatar
  • 6,250
1 vote
0 answers
43 views

accurate method of determining turns ratio of single phase transfomer

In determining the turns ratio of a single phase transfomer ,we are asked to use voltage ratio (Vp,Vs) side by side current ratio(Ip,Is). we open circuited the secondary transformer and put test ...
Alzeno Doe's user avatar
0 votes
1 answer
37 views

Buck Converter - C_OSS charging up loss

Consider the following synchronous buck converter: where Q1 is the high-side and Q2 the low-side (https://fscdn.rohm.com/en/products/databook/applinote/ic/power/switching_regulator/...
muosac's user avatar
  • 75
1 vote
0 answers
78 views

LM317 does not regulate 12V to 8.2V

I am working on a project for which I needed to design a small linear regulator circuit in order to supply 8.2V for reading out sensors. I chose to use LM317, since it is quite simple to design and ...
karolista's user avatar
-1 votes
0 answers
65 views

How detect low voltage (under 100 V)? [closed]

I want to make a circuit that detect low DC voltage under 100 V. I use op-amp like 741 but this op-amp voltage operation is limit and don't work up to 100 V. Could you please introduce me a good ...
david olma's user avatar
0 votes
0 answers
25 views

20V Max Lithium Battery "Charge Maintainer"

I have a gadget that uses a 20V max, LiIon, DeWalt compatible battery. It's detached for charging. A DeWalt charger is used to fast charge the battery. The gadget has a POE ethernet connection. I'...
Dave Thomas's user avatar
0 votes
0 answers
45 views

STM32 Ethernet custom hardware

I'm having a problem getting the ethernet interface of an STM32H745 to work. This is my circuit: I got a nucleo-h745zi-q which has an MCU very similar to mine, and an ethernet interface practically ...
Federico Massimi's user avatar
0 votes
0 answers
31 views

Which relay should I use for remote control for circuit breaker motor drive over a distance of 400 Meters [closed]

I am looking for an industrial long distance relay that can be used to control a 230Vac motor drive of siemens circuit breaker. The controller is installed at 400 Meter distance in the transformer ...
Smrtngy's user avatar
  • 37
0 votes
1 answer
46 views

Inductor sign with single line on the top

I am new to schematics, so can someone help me understand what this part of the circuit means? What does "FB" stand for there, and which components should I use? I guess these are inductors, ...
kaxa gvimraze's user avatar
5 votes
3 answers
1k views

MOSFETs stabilizing current in coils keeps burning, how to protect them?

I am trying to stabilize the current in coils in my experiment. For that I am using a circuit as in the picture: First section is a fast switch. It is also galvanically isolated from the TTL signal ...
Einaudi's user avatar
  • 53
0 votes
0 answers
41 views

Most efficient hardware to run network of logic gates?

I have a neural network where each unit in the network is a logic gate. I can simulate such a network on CPUs and GPUs using popular machine learning libraries. What would be the most efficient way to ...
Luke Taylor's user avatar
4 votes
2 answers
1k views

Which power source is good for my project?

I want to create an inverter LED light source. I would be using 2 COB LED lights rated at 4 volt DC, 8 watt. My idea is that when the phase is connected, I want the light to glow and at the same time ...
Adonis's user avatar
  • 43
2 votes
2 answers
95 views

What is the point of using set and reset in JK Flip Flop?

Here is the scheme of a JK flip flop. I know what does asynchronous reset and set, but why would we use them? In what scenarios it is needed?
tozinn02's user avatar
1 vote
1 answer
34 views

Determining current magnitude

Here is problem 3.9 from Hayt "Engineering Circuit Analysis". I reduced it to single voltage source, keeping direction of current the same as indicated by arrow. simulate this circuit &...
user1700890's user avatar
0 votes
0 answers
22 views

STM32 Wakes up from standby mode immediately

I'm trying to get my board (STM32L072CZ) to enter the standby sleep mode, and it seems to be entering this mode, but it also immediately wakes up again. After searching the great webs the solution ...
Rasmus Madsen's user avatar
1 vote
4 answers
113 views

Reducing the fall-time of a P-channel MOSFET

I have implemented the following circuit in hardware. My required output across load (R7) is a pulsed signal of 20 V, 100 kHz, 10% duty cycle (10 us pulse width and ON-time of 1us and OFF-time of 9 us)...
Sahasra Vaiishnavi's user avatar
3 votes
1 answer
36 views

How to determine voltage level of the ultrasonic transducer?

I am designing the generator for an ultrasonic transducer for a cleaning system and I am not sure how to set the output voltage level. I measured the voltage level of the existing products, peak ...
hax's user avatar
  • 33
5 votes
2 answers
237 views

Monopole antenna with coil design

(Note: I'm a beginner in antenna theory) When browsing for low cost antennas online, there seems to be class of monopole antennas that have a coil or two built into the monopole, and are advertised to ...
小太郎's user avatar
  • 213
0 votes
0 answers
42 views

FPGA output timing explained

As a hardware designer you have consider the timing constraints of both the input and output device. Input devices specify a setup and hold time reference to the clock (the time in which the data ...
Dukel's user avatar
  • 73
0 votes
0 answers
30 views

How to implement Battery Authentication IC's? [closed]

Hi I'm looking to implement either an EPROM or SHA-1 chip to my electric bike. I'm unsure of how to implement it and how to do it. Can anyone help?
quadracer904's user avatar
2 votes
1 answer
57 views

Non-contact powering of LED indicator from a high voltage cable

We manufacture fireproof power plugs for high-voltage transformers used in mines. The way it works is we take the incoming single-phase cable and epoxy it into the plug and attach it to the ...
Mark Coetzee's user avatar
0 votes
3 answers
92 views

Reading 4-20 mA industrial pressure sensor

I am trying to read an industrial pressure sensor (datasheet) with range 0-10 bar and output 4-20 mA, with an Arduino Opta RS485, powered from an external 12 VDC source. Leaving the sensor in the air,...
p_a321's user avatar
  • 103
1 vote
0 answers
43 views

INA226 Vbus voltage reading has a 1.5% error on all measured voltages

I have an INA226 module with a 0.1 Ohm shunt resistor, here's the schematic: Device powered from 3.3V (ESP32 regulator's voltage). Since I only wanted to test the voltage monitoring function, I ...
AlectronicZ's user avatar
-2 votes
0 answers
42 views

PCB OF A CLAMP METER WITH MISSING CR7, C95 [closed]

Please assist to know the smd components details,on PCB of Fluke 375 clamp meter. Picture is attached. CR7 3PIN and C95 2 pin. CR7 might be a double diode, transistors are labeled as Q on this pcb.
Khalil Mohammad's user avatar
2 votes
1 answer
187 views

Op-amp - Lead compensator design

I would be very happy if anyone can help me find answer regarding to questions below: The lead compensator is added to the system to increase the phase margin. 1'st picture is related to the ...
Mhan's user avatar
  • 85
0 votes
0 answers
16 views

DC Offset in LCD clock signal

I am getting DC offset in clock signal. Clock signal has 24MHz frequency. The DC offset is around 400mV. Also I was expecting Square shape waveform but I am getting sinusoidal with DC offset. Clock is ...
Harish's user avatar
  • 1

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