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8 views

Calculating kW of rotational power required by an engine to generate 3 phase power when phases are unbalanced

With respect to phase balance -- or lack thereof, if one phase is much higher than the others (for example 75, 100, 75) the total power according to my generator's display is 46 kW, but would the ...
0
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0answers
7 views

typing error showing on quartus prime lite?

I am trying for few hours to understand why Quartus Prime Lite keep showing an error when I compile this basic VHDL code, I kept it like this to understand why it is showing an error just by typing!!!....
0
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1answer
13 views

Printed dipole vs ordinary (3D) dipole

In order to make a comparison between an ordinary (3D) half - wavelength dipole and its printed (planar version), I've done a simulation in both cases. Both were designed to work at 3GHz (100mm ...
0
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2answers
30 views

Why did he multiplied with the emitter current?

I don't understand why did he multiplied in that equation with the Emitter current (1.618, calculated above), why would it be the same in the collector?
0
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1answer
16 views

Understanding two Multivibrator models

I simulated the two multivibrator models in CMOS technology using the cadence tool. I was expecting the model 2 with Schmitt trigger(ST) will show robustness in PVT (Process Voltage temperature) ...
1
vote
1answer
23 views

Strange problem with differential amplifier for current sensing with TL084

I have a problem with the circuit below: I'm using the op-amp as differential amplifier for low-side current sensing with gain of 100. All resistors are 0.1% and the load is just a variable resistor ...
0
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0answers
18 views

Mixed logic gates AC or weird multiplexer

I was thinking of ways to control 2 devices each with 3 bits or more input. Ideally this can be done with one inverter and 6 AND ports. Or a weird multiplexer. Of course it can be done with 2 74LS or ...
0
votes
1answer
24 views

What connector is this on the Eachine E160 flight control board?

I'm trying to find the exact type of this 3-pin clippy connector - I need another one to connect the SBUS signal to the board: Measures: Pitch: ~1mm Total width: ~6mm Total height: ~3mm I've been ...
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0answers
15 views

No port matched and or doesnt connect to anything

Good evening, I'm having some issues with some verilog code, or quiet a lot to be honest. Or with Lattice's software actually.. This was tried in Lattice Radiant. First off, I'm getting these warnings(...
0
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1answer
22 views

Arduino UNO-CH341 keeps resetting randomly

A brief summary: I work at a small workshop/factory, and we've got a single three-phase compressor for the whole factory, a week ago the compressor controller flat-out died and that left the entire ...
0
votes
1answer
21 views

Simpler delay before power on

I'm trying to create a circuit that will make the output go high some amount of time after a 5V control signal goes high. That delay time may vary by application, so I'll use a potentiometer in place ...
2
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0answers
23 views

How can I generate a signal and sample it simultaneously in STM32F407?

I was able to generate a signal using DAC periphery and a HAL_DELAY. I want to sample this signal using ADC by connecting DAC output to ADC input for FIR filter purposes. But there is a logical ...
0
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1answer
32 views

What surge/lightning protection is needed for an elevated off-grid solar security system?

I have a semi-urban hunting location that I would like to monitor remotely. I have an elevated (~20ft) box blind I am installing off-grid solar system (specs below) in. The purpose is to power a small ...
1
vote
1answer
40 views

is there a LED constant current Driver that works like UNL2003? [closed]

I need a constant current driver that works like UNL2003. most of the LED constant currents drivers use Serial communication with a MCU. is there is any ICs that might works like an ULN2003?(input ...
0
votes
1answer
37 views

Standalone current limiting circuit for Ultracap banks

I've been experimenting with ultracaps for a while now and I have a very specific problem: I use the ultracapacitors to compensate for line inductances and general power filtering. When I install a ...
0
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3answers
48 views

One battery slot kills its sitting battery

My kid has a battery-operated toy, it runs on three AAA batteries, connected in serial. Once, the toy suddenly stopped working, but all batteries were good. I decided to disassemble the toy and look ...
1
vote
1answer
42 views

Portable battery charger: how can I recharge the batteries without direct connection to my home electricity?

I'm working on a smart watering system for few flowerpots I have in my balcony. My main problem is that I don't have electricity output there, so I'm trying to think of a way to power my Arduino with ...
0
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2answers
62 views

a transistor vs two transistor as a switch

my question is about the usage of the transistor. why does when I use a transistor as a switch, the led dimming first and then off. but when I use two transistors it directly switches off. These are ...
1
vote
2answers
56 views

Shielding powerful HF EMI

I'm trying to install a plasma cutter on a CNC machine, but the problem is that the cutter uses a high-power HF start to initiate the cutting arc, and this causes horrible interference with my control ...
0
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0answers
37 views

Transimpedance amplifier transient voltage issue

We have below transimpedance amplifier, I have below issues, would like to know if this is even fixable or could be reduced: When a large load turn on in main power supply of TLE2426 turns on cause ...
0
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1answer
48 views

Are there smaller packages for Standard rcl (resistor, inductance, capacitor) than 0402mm

I need to miniaturize a PCB as much as possible. Are there packages available on mouser for standard components like resistors (100k) or inductance (Up to 30nH) or Cap (Up to 100pF)?
0
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1answer
27 views

Powering BLDC motors using a Li-Po battery

I'm building a self balancing cube using 3 reaction wheels much like the Cubli but smaller. I'm a mechanical engineering student with not a lot of electronics experience other than the basics. The ...
2
votes
2answers
48 views

Why is Arduino Uno Rev3 input voltage specified up to 20V? OpAmp

The Arduino Uno Rev3 has an OpAmp (TI LMV358IDGKR datasheet) where the non-inverting input ("CMP") is connected via a voltage divider to Vin. The OpAmp's supply is connected to 5V. On the ...
0
votes
1answer
32 views

How to flash a bootloader onto the STM32WLE

I am currently designing a custom PCB with this board: https://www.st.com/en/microcontrollers-microprocessors/stm32wle5jb.html I cannot find any mentioning that it comes with a factory installed ...
-1
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1answer
55 views

Paralleling of battery chargers

I am trying to develop a system where different chemistry of battery are connected in a single system. The following figure explains the idea: You can see two battery chargers take same input supply ...
0
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1answer
34 views

Reg opamp circuits with no input signals

In circuits where there is no input signal shown explicitly as in the figure shown below, how do we determine the behaviour of the circuit? I understand that the power supply given to the opamps ...
0
votes
1answer
36 views

How to remove byte to byte delay using MCP2210

I am using a Microchip MCP2210 USB to SPI converter, however during operation, there is a delay between the sent bytes. Is there a way to remove this ?
2
votes
2answers
117 views

Why must the voltage drop over resistors in parallel be the same?

I am wondering why it is the case the when resistors are connected in parallel the voltage drop over them must be the same? The reason I have seen arguing for this is that the electrons before the ...
-2
votes
0answers
24 views

Mosfet driver IC for zero voltage switching [closed]

I am designing a 200khz inverter circuit with full-bridge topology to implement zero voltage switching. Where the MOSFET turns on with ZVS and turns off with ZCS. I'm using IRF150 and wanted to drive ...
3
votes
2answers
90 views

Shannon-Nyquist - only for repeating signals?

This was triggered by the comments in this question. I'm using this definition of the Shannon-Nyquist theorem (form wikipedia): If a function x(t) contains no frequencies higher than B hertz, it is ...
0
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2answers
66 views

Arduino frequency meter

I'm new to Arduino and was making a frequency counter using the pulseIn function. The problem I'm facing is that the output values are very absurd, such as 66334, 883339,12, 34 etc. and not the actual ...
0
votes
2answers
55 views

SD card breakout board

I'd like to read data from a SD card using a microcontroller (through SPI protocol). Looking for a slot for the SD card, I saw two different boards. https://www.adafruit.com/product/254 This one has ...
0
votes
1answer
66 views

What would a voltmeter measure if you had an electromotive force generated by a changing magnetic field?

Suppose I had a circuit of this sort, and there was a changing magnetic field through the central triangle: Faraday's law suggests there will be a current through the loop. The voltmeter is supposed ...
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0answers
12 views

Problem in process corner simulation using CADENCE ADXL

My question is related to CADENCE software simulation. I am doing a process corner simulation of a simple inverter using ADXL in CADENCE. But the problems are: 1_ When I run only the nominal corner it ...
0
votes
0answers
23 views

How to select between different PLL and divider configurations with same result

I'm new to STM32 and totally ARM. I'm learning STM32 by a NUCLEO-L053R8 board and currently working on clock configurations. I want to clock CPU, USB and RNG all by PLL connected to HSI16 so there is ...
2
votes
1answer
32 views

Functionality of output stage of a cmos amplifier circuit

I have the following circuit and I'm wondering a little bit about the functionality of the output transistors M12-M19. simulate this circuit – Schematic created using CircuitLab I know that M1,...
0
votes
1answer
37 views

Confused about the gain effect over cutoff frequency

I am a bit confused regarding the gain effect over the cutoff of the active low pass filter. While I was checking the AC sweep ...
0
votes
0answers
15 views

Typical voltage range for a LiFePO4 BMS

I'm about to hook up some LiFePO4 (32650) batteries to solar panels. I bought a couple of noname BMS boards ("HX-4S-F30A") for a 4S configuration for the batteries online, and the ...
2
votes
2answers
132 views

Feedback in multistage amplifier

I found this schematic online for an audio amplifier and I noticed the 100k was some sort of feedback system between the base of the first stage and the emitter of the next. How would you describe ...
0
votes
2answers
50 views

Typically, do same-sized SMD ceramic capacitors with different capacitance have different ESR?

I know that depending on the dielectric, the technology, the company etc, but typically, if say two SMD ceramic capacitors are the exact same size (also of the same technology if you wish,) and their ...
0
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0answers
26 views

Feather 32u4 too much current draw

I am trying to build a battery-powered application using the Feather 32u4. I need a timer to trigger every 120 seconds (although Timer1 with it's 8 second limit would suffice for the beginning), thus ...
0
votes
1answer
25 views

How to adjust both brightness and contrast of a TFT LCD display

I am developing an HMI using the display "S039QWQ01HS" and I have the requirement to provide control to adjust the brightness and contrast of it. For the brightness control, I have already ...
0
votes
0answers
19 views

CircuitPython & ESP32-S2-Saola boards returning code 43 errors

I am currently trying to connect to some ESP32-S2-Saola devboards that are running CircuitPython 6.1.0 via the USB OTG pins, but the device shows up as as "Unknown USB Device (Device Descriptor ...
1
vote
0answers
53 views

What is the purpose of a diode in parallel with a BJT in a MOSFET drive circuit?

This circuit shows a complementary emitter follower driving an IRF 150 MOSFET. The textbook says that a diode D provides a path for the discharge of the base-emitter junction capacitance of transistor ...
0
votes
1answer
27 views

How to get desired current on output of relay's module

I'm building automatic garden watering system using Arduino Uno 5V relay module - this one https://www.amazon.co.uk/2-channel-trigger-module-JQC-3FF-S-Z-RBTMKR/dp/B01NAJ67ML, here are technical ...
0
votes
0answers
23 views

Autodesk Eagle: How to design predetermined breaking points / line of breakage

How can you best design a line of breakage in Autodesk EAGLE that makes it possible to break the individual PCBs easy by hand? Please see here what I would like to do (blue lines are the lines of ...
0
votes
1answer
37 views

High voltage amplification of a waveform generator output

I need to drive an ultrasonic transducer with a high center frequency (25 MHz) using my function generator that outputs a 25 MHz sine wave at only 5 Vpp. The problem is that the transducer needs at ...
0
votes
2answers
50 views

Vibration test failure

I have designed a power supply card using V7805-2000. Copper thickness is 70 microns, board size is 5 cm × 5 cm. When this underwent vibration test the regulator came off, broken into two pieces(...
-4
votes
0answers
61 views

Car Audio system Capacitors [closed]

I have three amps two 5000 watt and one 1000 watt...what will be better when buying capacitors for the system? 3 separate caps? If so which is better? A high farad or low farad?!
1
vote
1answer
80 views

What does this MOSFET do in this voltage regulation circuit?

In the below schematic, V_USB is connected to the +5V of a USB jack, that the user can plug and unplug. There is also a backup LiPo Battery, whose positive terminal is represented by V_BATT. From my ...

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