All Questions

I have this simple LED configuration: Voltage source is 24VDC so with the 1k resistor and three 2V LED, current is around 20mA. I want to put a PLED device across each LED. how do I select correct ...

I just finished setting up my spectrum analyzer and I would like to ensure that everything is as accurate as possible. I was thinking of getting some kind of RF transmitter that transmits at a ...

Finally bit the bullet and considered getting help with a simulation I'm looking to get right. Just a heads up, I have limited experience with SMPS simulation in both LTSpice and Multisim. The circuit ...

I need a low noise microphone preamplifier for my Arduino. I used a battery and standard wire but I had noise in my circuit. I need gain 20-20kHz. Can you help me with the schematic?

I was wondering, if I put an Arduino with a few sensors on let's say a water rocket to track acceleration and height and what not, how would I save this data? I'm assuming that I want to have a high ...

So I am going to start to build a table that will have two different stands of lights, which are linked below. I was planning on using an 18 volt Milwaukee battery, but after getting the lights, I ...

Consider the schematics on the figure. The aim is to measure (sample for e.g.) mains 220V voltage. MAINS_1 is phase, ground is connected to neutral. The most obvious idea is to use a transformer, but ...

My question is similar with this question: https://physics.stackexchange.com/questions/299199/will-a-battery-connected-to-the-earth-eventually-deplete#:~:text=First%20off%2C%20every%20battery%20will,...

it is asked to make a non ideal inverter opamp that has an input of 2mV or and get an output of -100mV, so I think the next circuit should suffice. simulate this circuit – Schematic created ...

Thinking of cheap(er) consumer wireless products. Modulator aside, how is the RF carrier signal generated? Do they use really small capacitances/inductances on a chip die to make an RLC (say, Colpitts-...

In this video from Ben Eater, he uses an RC circuit to create a push-button "write-pulse" generator for his EEPROM (discussed around the 14 minute mark) that ensures the write pulse fits ...

I am trying to identify and find a replacement for the attached transformer. The green/white leads with the red center tap have a 50 ohm resistance. The side without the center tap has a 0.5 ohm ...

Reference paper: https://ieeexplore.ieee.org/document/6183251 I'm trying to simulate the speed control for a brushed DC motor using a 555 timer (astable multivibrator) and a high boost convertor using ...

Does anyone know what does the self-discharge parameter mean? I know what self-discharge is, but what does over 97% mean?

I have a 2-wire thermostat that activates my baseboard heater when the 2 wires are shorted. I did an experiment closing those two wires with a relay and got that working well with an ESP32 as the ...

How do i mathematically model a 3 phase ac servomotor's current control mode? someone please help me. The model of the the servomotor is BSM132C 5200AA Thanks

I am trying to make a boost converter that step up 5V to 400V. I am doing it for a geiger counter. I know that it's complicated, but it should be possible. Anyway, here is my schematic: My problem is ...

I am designing a 1kHz inverter in a push-pull configuration with KA3525 and IRF540N MOSFETs. Input - 12V Output - 110Vac - square wave filtered to sine wave Power - 15W at 1000Hz When I fire it up ...

For engine design, there is The Fundamentals of Combustion Engines by Heywood. This is generally regarded as the bible for combustion engine design, and deeply covers almost all aspects of motor ...

I am trying to communicate with a device over SPI using an STM32F429 Discovery kit. I would like to use the SPI5 but according to UM1670, table 7 and STM32F429xx Datasheet, table 12, page 76, there is ...

I have this circuit: Have I done everything correctly? I cannot find my mistake. Help appreciated.

I want to press a key on my keyboard, for example "a" and a device should take the scan code of the button I pressed and transform it to something else: e.g. "b" or the scan code ...

First off, thanks for taking the time to read this and help out. Here's a quick overview of what I am trying to design. I have a break out box that has 200 female probe inputs. Each input is numbered, ...

I am calculating RMS value of trapezoidal wave. I found its formula like below: and at last the RMS value formula: u = 30degree or pi/6 --> especially pi/6 A = 12 When I calculate RMS value by ...

I've a 12V 80A motor, for drive this i'll use a H-bridge with mosfet, in order to divide the current per H bridge we can drive a motor with 2 H-bridge? I'll use mosfet, we cant put mosfet in parallel

I've this TO-247 MOSFET http://www.datasheet.es/PDF/203551/2SK3271-01-pdf.html how much current will support this case? I've to control a 12V 80A DC Motor

Faraday cages protect against EM radiation and charges. As far as I understand, this effect happens through the induction of an electric field, which produces a current inside of it, which then ...

Interested in Embedded Systems, I'm coming from Computer Science background. There is a thing that I can't get my head around for awhile about pins of GPIO. Let's say that we have a port which is ...

I need to connect an Event Detection pin (pin of the NXP NTAG 5 component) to a GPIO of the NXP i.XM6 processor. The problem is that the NTAG 5 pin has a logic level of 5V and the GPIO has a logic ...

I am struggling getting my head around the input and output logic levels, mostly the output levels of this STM32 (STM32F446xC/E). This table shows the output logic levels as dependent on if it is a ...

I'd like to make an LED blink with a varying frequency that depends on a voltage. I know about the 555's control pin, but I'd like the blinking to vary continuously, instead of switching between just ...

I need to power a miniature LED light show that will draw a few hundred mA, or possibly more, and requires less than 5 Vin, and a microcontroller board that wants 7-21 Vin. I was thinking the easiest ...

I have plant, $$P(s) = \frac{1-s/5}{(s^2 + s/4 +1/4)}$$ I am taking a mixed sensitivity approach for that I have chosen \$V\$,\$W_1\$ and \$W_2\$ as follows: For bandwidth, \$\omega\$ =1 so I chose M ...

I am trying to understand what size vias I should use for my 5V power traces. The trace typical runs at 0.5-3 amps and is 2mm and about 150mm in length. The width is huge, but I do have the extra ...

I'm building a LED driver using Diodes AL8871Q IC to power a XHP70 LED powered from a 4 series protected Lithium battery pack, integrated on the board it has an Attiny85. I plan to use the Attiny85 to ...

What is the thermal voltage of a Ge diode?I know for a silicon diode is about 26mV at room temperature. I have this circuit: simulate this circuit – Schematic created using CircuitLab and a set ...

This is more of an acquiring more knowledge question. I have used a few ICs, such as the 741 op-amp, AND, OR, NAND gates, etc. I have also used a few micro-controllers like the atmega32, atmega328, ...

simulate this circuit – Schematic created using CircuitLab Can a wall switch be wired to a DC circuit like these two circuits??

I'm trying to "smartify" my LED panels by controlling them without the actual remotes. My goal is to make it possible to control the lamps from an http endpoint. I have an Raspberry Pi 4 as ...

I have been giving this assignment working with Arduino that would light up a 7-segment component, when a push button is pressed. Is there an intuitive way of looking at the circuit and recognize ...

I am writing variant files for SAMD21J/G/E. I am unable to use TCC3 of SAMD21J/G/E in Variant.cpp for arduino IDE. If it is used Arduino IDE shows error TCC3 undeclared variable whereas, all other ...

I build non-inverting op amp with single supply voltage cca 9V. The basic scheme is shown in the figure below: How to limit output AC signal if the base DC voltage is at half the supply voltage 4.5 V ...

All, Sorry but I am new to this topic and have no experience with SDR myself.First, I briefly give the hardware that I am using: HackRF One Following antenna: https://zsecurity.org/product/atheros-...

I have a populated PCB, and I want to draw a circuit diagram of it. For printed documents, you have OCR which can recognize text in an image. Is something similar available for PCBs? i.e. I provide ...

the cells are 3.2 volt at 280ah buy 32 cells what is the best 12/24/28v and the best BMS for setup I have all ready purchaced cells and am waiting on delivery to install in my rv

Here the schematic of a small board with a 74HC595 shift-register: Here the detail of each output. They are connected to QB..QE. Nothing is connected to the collectors of BJTs and the board contains ...

I am using PSIM to simulate the TL431, and I have some questions. This is my PSIM circuit: When Vref is less than 2.5V, the TL431 doesn't conduct, it looks like an open circuit so Vo is almost 5.1V. ...

I have added a P-MOSFET before my main circuit, between the v+ of the battery, and the Vcc main power line of the circuit, so that the battery stays disconnected and doesn't drain until I am ready to ...

For a device I'm retrofitting, there is a risk that some I2C datalines could be shorted to a supply rail that can be between 12-44V, or ground To the best of my understanding this bodge circuit per ...

I hope to know the formula how to get Max output voltage and min output voltage, output max souring current, output max sinking current. also Gain ... how to judge them in this circuit...? Also, I ...