# All Questions

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### Problem: PMSG connected to Three-phase PWM rectifier - Simulink

I am implementing a control for three-phase rectifier in order to have a constant DC-link voltage. I have a PMSG which is connected to the rectifier and a capacitor (DC-link); I want to model PMSG ...
10 views

### Transmit large data through UART OR Ethernet

I followed the AN4666 to read data from GPIOC ports triggered by timer input capture mode and save into a large buffer of uint8 in size of (510000) arrays, all I want to do is to transmit the full ...
7 views

### Phasor format vs time domain format question

I had a quick question regarding phasor format vs time domain format. Whenever we write in the phasor format the magnitude that we use, must be the rms value for voltage/ current, correct? Then we ...
14 views

### How to implement the same pulse shaping circuit twice on a single PCB?

Consider an RF pulse from a charge-sensitive preamplifier with 50 Ohm output impedance. This pulse is sent to a Gaussian shaping amplifier circuit to condition it for reliable ADC measurements. I ...
• 685
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### Best way to implement feedback controller over half-duplex USB?

I am setting up a hardware-in-the-loop simulation using two Speedgoats (real-time target machines), where one simulates the controller, and the other the plant to be controlled. The controller and ...
• 535
15 views

### LTspice singular matrix error by changing model parameters

I am trying to create a model of an IGBT with the Z-model from ltspice. Started with the default values it works, when I change parameters more and more I get the "singular matrix error" for ...
• 1
1 vote
48 views

### Why is this an example of actuator?

Hi, I know that an actuator is: a component of a machine that is responsible for moving or controlling a mechanism But how is a simple LED circuit as I’ve attached an actuator example please as there ...
• 11
1 vote
10 views

### How can I use CDC_TRANSMIT_FS() correctly?

I am trying to develop a sensor driver on the STM32F401CCU6. I have already worked out the sensor data acquisition on the STM. The problem I am facing is getting that over USB to my host system. ...
1 vote
14 views

### LTSpice, AD8677 instance has more connection terminals than the definition

I want to simulate a schematic with an AD8677. I found the Spice model here. I renamed the model in ad8677.lib and placed it to my library folder. Then I made a copy of the generic opamp model opamp2....
• 183
45 views

### Why make second stage current larger than input stage current in op-amp?

When people speak about the slew-rate of a Miller-compensated op-amp, the usual derivation is that the slew rate is approximately the input tail current divided by the Miller capacitance. E.g. here (...
• 12.3k
1 vote
24 views

### Understanding the discrepancy between the input impedance of a signal analyzer and the input noise

The manual of a signal analyzer I am working with states that the input impedance is $1 \ {\rm{M\Omega}} + 50 \ {\rm{pF}}$, the manual also states that the input noise is \\$< 10 \ {\rm{nV_{rms}/...
• 227
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### How to measure the leakage inductance of LLC Split bobbin transformer with two auxiliary windings

Let’s say I am having ETD core and split bobbin for LLC Design I have 4 windings in that transformer primary secondary primary aux secondary aux I am winding the primary and primary aux windings in ...
61 views

### What is exactly a "stabistor"? How does it work and how is it constructed?

Today, for the first time in my life I encountered the term "stabistor". From a quick search on the Internet it seems it's a two-terminal diode-like semiconductor device used to regulate low ...
50 views

### What is the best location for Top Component Center

When designing footprints of symmetrical components like SOIC-14, it is easy to determine the top component center, but where should be the best location for an unsymmetrical component? Is top ...
• 485
33 views

### How to interface USB Webcam with an ARM Cortex M3/M7?

I want to interface a USB Webcam (USB2.0 1080p 2MP) for a hobby project. The idea is to take pictures (no video feed/recording) in regular intervals and send them over Ethernet to a server. I don't ...
16 views

### Help required regarding KVL and KCL laws to develop the state model

I am developing a state space model for the given circuit. I am confused about the series capacitors C7 and C8 and that connected parallel to C6 but in between C7 and C8 there is ground connected. ...
46 views

### Burned motor controllers: possible root causes analysis

On a submarine robot we built, during an operation, we recently had 3 defect thruster motors (the internal power PCBs have many burnt components, 2 of the motors cracked open due to internal pressure)....
• 2,731
18 views

### Inline dimming circuit fed from dimmable lighting controller

I have an industrial dimmable lighting controller (240VAC, 50Hz) which has one output going to a splitter cable with multiple connectors, where many dimmable LED tubes can be connected. I would like ...
• 101
35 views

### How to properly calculate amps from home consumption metering system like Shelly EM?

I am creating a system for detailed measuring of power consumption in my home. For that I am using Shelly EM, which is using 50A hall sensor clamped over my main line (single phase 240V AC) inside my ...
• 165
15 views

### Phase detection accuracy with USRP N210 and CBX-40

I have designed a simple TX/RX system in GRC with a single USRP N210 and CBX-40. I am transmitting sinusoidal signals at various frequencies within the 2-6GHz range and detecting the amplitude and ...
• 1
38 views

### Why do some transformers trip circuit breaker. Eg a ups transformer. I need a soft start resistor details

I need a soft start for a ups transformer. Because when I power it with 230v ac it trips the breaker. I need a diagram to build my own soft start circuit.
29 views

### TVS Diode Testing

Nowadays, I'm tried to use a TVS diode but I think it is damaged. How can I test a TVS diode? How can I understand that is it working or not? What is the best way to test TVS diodes?
• 43
1 vote
42 views

### Could I change decoupling capacitors values on ATmega power pin?

I have a question about some capacitor values. I'm building, as part of my project, an Arduino with an ATmega328. For some reasons, in my design I have capacitors of 47 k that allow me to construct ...
• 35
33 views

### Keil uVision Disassembly Window with ARM Microcontroller

I have a couple of probably simple questions for you all regarding disassembly from C code to assembly code. I am using Keil uVision as a programmer and debugger with a TIVA TM4C123GXL microcontroller ...
• 1,134
63 views

### What are the use cases for the earth ground terminals in a bench power supply?

When I use bench power supply such as below: I use the red terminals as (+) and black terminals as (-) and also as ground. But the green terminal I never use and it is connected to mains earth ground....
• 528
1 vote
43 views

### Impact of circuit length in high frequency circuit

I learned that after the RF antenna, we need to determine the matching circuit and calculate the line impedance depending on the FR4 characteristics. I also learned that after we got the surface ...
1 vote
22 views

### Current-fed Royer oscillator startup speed

I am trying to design a current-fed Royer oscillator based 5 kV supply that needs to start up fast and then decay fast. The goal is less than 100 ms for both startup and decay. The criteria are to ...
• 343
14 views

### Controlling SMPS with SSR (Blinking SMPS)

I want to control AC for Meanwell RS-25-3.3 using SSR-25DA. When SSR is off mode the SMPS keep blinking as in hiccup mode, I think. I don’t think leakage current from SSR is too high to trigger this ...
18 views

### What are pre-driver and driver circuits in an IC?

I'm new to analog IC design. What does a pre-driver or driver circuit look like, and what is their main function?
25 views

### Is this a typical complementary astable multivibrator? [duplicate]

Is this complementary astable multivibrator more reliable to build on a breadboard compared to other complementary astable multivibrators?
59 views

### Capacitors in the path of power and ground

Is there any risk of using capacitors or decoupling capacitors directly between a top level power supply and Vss? The electrical rule checks don't propagate voltage through capacitors so this issue of ...
44 views

### Which complementary astable multivibrator is more reliable to produce for tests on a breadboard?

Astable multivibrator coupled with complementary astable multivibrator: I tried to build this schematic on a breadboard, but the complementary astable multivibrator circuit on the right does not work ...
162 views

### Is it possible to use basic networking on an FPGA without an OS?

I need to set up networking (just a basic echo server) on an FPGA board (ZYNQ Ultrascale+) using only the PL side. The end goal is to DSP a large amount of data coming from a receiver through ethernet....
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64 views

### 74HC595 shift register outputting data when it shouldn't

When I connect my Arduino with this 74HC595 shift register circuit, all the shift register's outputs go high, and any code I run doesn't seem to change this. Regardless of what I run, all outputs are ...
65 views

### Pull up resistor why is it low when switch is pressed

When the switch in a pull up resistor is pressed why would the voltage in the pin be read as low? wouldn't closing the switch also connect VCC to the ground? wouldn't that mean that the voltage at the ...
• 17
53 views

### Powering ESP32 and two MG90S using supercapacitor

I'm working on a drone-dart project (at a spare moment which happens almost never 😂). Dart is controlled by an ESP32CAM and two MG90S servo motors. It is raised to the sky by a drone and then ...
• 105
50 views

### What do you call the clear adhesive film used to shield electronics?

I am a newbie and am just trying to fix the remote control for my electric fireplace. I am trying to replace a peanut butter button with a contact switch. Between the cover and the PCB board there is ...
• 101
42 views

### Use of LM386 with simple regen receiver

I have been experimenting with a very simple AM regenerative receiver discussed at circuitbasics.com. The schematic is shown here: I obtain fairly good performance feeding the output to an old Radio ...
• 103
35 views

### DisplayPort with unpowered sink: EDID possible?

When using dvi or hdmi, the source provides 5V to power an eeprom inside a monitor or any other sink, reading the edid back and setting the resolution accordingly. That is possible because both dvi ...
1 vote
79 views

### Where to put audio isolation transformer?

I tried researching (aka Googling) but I couldn't find definite answer on install location of an audio transformer. Can I put this transformer inside the box? This is my preference. Or does the ...
1 vote
38 views

### Three-pin SMD part marked 550B identification

Can anyone help me identify this part?
104 views

### Why is one op-amp in my circuit messing up the other?

I am attempting to create a board that takes an input signal, outputs the buffered input signal and its inverse, and then also outputs the difference of those signals once affected by an outside ...
341 views

### TC962 Voltage Doubler - Why the slightly lower output?

I am prototyping this voltage doubler circuit based off the datasheet of the TC962. Capacitors are GRM21BZ71E106KE15L. When applying 9V at the input, the output is 17.96V at no load. When drawing ...
• 131
1 vote
51 views

### P-MOS control and capactive load

I am trying to drive an high capacitive load with a P-Mosfet. I added a PTC to limit the current, but it doesn't seen to be working. The mosfet is often killed. Can anybody help and provide a 'simple' ...
221 views

### Cheapest solid-state way to turn a 240 VAC, 15 W resistive load on/off

I need to be able to pulse a 240 VAC, 15 W resistive load on and back off. I need it to turn on only for a single line cycle, then it will remain off for at least 60 seconds, so perhaps the components ...
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58 views

### Electromagnetic induction metal detection circuit

I am trying to develop a metal detector for use in a minesweeper competition. I aim to use a coil based metal detector because it has a long range and can detect underground metals. There was a ...
36 views

### Soft support/stress piece to be used with PCBs

I need to add some little stress on a PCB board which connects to another board as follows: If I dont do that the headers of the top might move due to plastic enclosure stress on the other part. I ...
• 3,510
1 vote
49 views

### Finding poles by inspection - 2 resistors

This is a follow on question from Finding poles by inspection - R to ground Is this correct? I have tried to follow the approach there.
• 2,673
65 views

### Minimizing logic expression for two-input NAND gate implementation

I have recently been struggling with this homework problem that is requiring minimization of a logic expression to be implemented using all NAND gates. The problem requires a very small number of NAND ...