# All Questions

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### Transformer ratio of a transformer that connects a generator to a MV grid?

Inside my one-line diagram in which I am studying some properties of the medium voltage grid, I want to connect a generator to the MV busbar to study the hosting capacity. Therefore there is not a ...
89 views

### What is the benefit of this capacitor?

As I know capacitor in DC circuit is not let current go through, and also it is just charging for a while and it becomes like open circuit, so what is the benefit of it?
179 views

### XKCD 356 puzzle

I was reading XKCD and saw this comic: Turns out it works, and have been thinking about this for an hour and have gotten nowhere. My first thought was to find the resistance of all paths of length ...
1 vote
43 views

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22 views

### SVPWM control on a BLDC Motor: No-load current is too high

I'm having issues running SVPWM control on a 2 pole-pairs. I'm using a Micronas HVC4223F with a 12V motor Faulhauber 2232BX4 with integrated Hall sensors. My card's half-bridges have over-current ...
1 vote
63 views

### Frequency Response of Antennas

Electromagnetics and antennas are not my main area of expertise. However, I have a specific question about antennas that I want to get right in order to make sure my signal processing is right. What ...
• 11
19 views

### DebugMon_Handler not triggered even after configuring DWT (Data Watchpoint and Trace) to look for memory writes

Can anyone advise why my actions described below do not work?: I have been trying to run the code snippet from the post Can Cortex M4 data watchpoint trigger an interrupt without a debugger? on(...
1 vote
112 views

### Why this grounding scheme?

The NASA technical book about grounding in spacecraft (NASA-HDBK-4001) (I believe the question may be relevant for any other terrestrial application) mentions this grounding scheme for subsystems: ...
• 1,052
314 views

### What is the meaning of temperature characteristics in capacitor datasheet?

I found a datasheet for a medium voltage ceramic capacitor in door knob form factor. I'm not familiar with one of the stated characteristics. Specifically, the temperature characteristics: +22/-33%....
• 101
61 views

### Altium designer PCB - Strange and confusing symbols everywhere (From DRC - Design Rule Checker)

I'm starting to learn Altium Designer, and I have this on my PCB screen: I've tried several things, but nothing works. Here is the same image, I just moved the components away: Can someone explain ...
• 43
17 views

### How do you combine state space models of a large power circuit having control circuit?

I am trying to model a hybrid network using state-space representation. How do I start? I have modeled the individual circuit figures. but I don't know how to proceed with combining the control and ...
• 1
27 views

### The problem with sensitivity time controlled (STC) based on pin diode

I'm using sensitivity time controlled (STC) pin diodes of PN:MPP 4201A-206 for our applications. Our operating frequency from 1300 MHz to 1400 MHz. See the schematic diagram below. As device ...
249 views

### DC motor speed control without changing the voltage

My truck's (2013 F150) blower motor lets you control its speed using a dial on the dash. I assumed the dash dial change the resistance of the circuit the blower motor was on, but when I took voltage ...
• 125
34 views

### Motor voltage spike

The circuit below is used as a relay in order to cut-off the common ground C- and Motor-. In my system, the m otor driver (Motor+,Motor-) is connected in parallel with the supercapacitors (C+,C-.) ...
2k views

### How long can a micro SD card hold data without being powered? [closed]

I lost a micro SD card few years ego, and I'm worried that someone may find it and misuse the data stored in it. How long can a micro SD card keeps the data without being powered, ignoring other ...
1k views

### How does current flow in multiple vias?

How does current travel in multiple vias from one layer to other? For example, we connect four vias, each of which has a limit of 1.3A each from power plane to sink device. If the sink draws 4A of ...
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33 views

I'm using a ADS1113 delta-sigma 16-bit ADC to sample a bipolar signal from a force sensor at 50Hz, and I have found a weird phenomenon. When the signal negative or positive, there is no issue, but ...
• 23
26 views

### What is the link between conjugate matching efficiency and amplifier efficiency?

In the design of a class AB amplifier, there is part of the understanding that I miss. It is well-known that the maximum power transfer is achieved when the load impedance is the complex conjugate of ...