# Tag Info

Accepted

### Cross section of ceramic capacitors

It looks to me like the grinding/polishing has been done fairly well (with more care you could have less scratches), and you're looking at an accurate and undamaged image of the capacitor cross ...
• 12.2k

### Will this mains disconnect circuit work?

Firstly, you are playing with mains electricity. Everything I suggest here is contingent upon you knowing that it could kill you, or someone else. Secondly, altering mains-connected wiring may lay you ...
• 37.6k

### Will this mains disconnect circuit work?

You need a no-volt-release switch, which is designed to do exactly what you want. Like these ones. They are used in industrial machinery to stop motors starting unexpectedly after a power cut. You'll ...
• 1,042
Accepted

### Why is power of a signal equal to square of that signal?

If the signal is represented as a voltage $v(t)$ or a current $i(t)$ and it is connected to a (1 ohm) resistor, the power dissipated in the resistor is proportional to $v^2(t)$ or $i^2(t)$. ...
• 3,881

### Cross section of ceramic capacitors

I assume the purpose of this exercise is to source capacitors that are OK. Unless you are buying gazillions of the things, and so would have the purchasing clout to make the manufacturer listen, ...
• 168k
Accepted

### Why we use conjugate of current than the original phasor in the calculation of Complex Power i-e S=VI*

The voltage and current signals have an angle associated to them, better known as $\theta_v$ and $\theta_i$, respectively. In terms of power, you want the phase difference between those two ...
• 5,724

### What is this Op-Amp Configuration doing?

It's a precision full wave rectifier. Try searching on google for it using those words. Here's one: -
• 462k

• 22k
Accepted

### Order of precedence for parallel operator

It looks like the parallel operator is surprisingly common, and there are precedence rules defined by some sources, but not all. MIT in their courseware suggest using it, and set exam questions on it....
• 56

### Analysis of Preamp circuit

the purpose of the 0.1 µF input capacitor and the 200 kΩ resistor is not a HP filter, but an AC input coupling; if it was standalone, it would be a high-pass filter with a ~8 Hz cutoff frequency, ...
• 95.7k

### Rectified Voltage doesn't seem possible

The voltages shown are measured relative to ground, and they are assuming an AC-coupled average-reading multimeter. It's a simple bridge rectifier. The 10nF capacitors are to reduce buzz in the audio ...
• 404k
Accepted

### AC analysis of voltage divider CE amplifier - how are non-parallel resistors treated as parallel?

What properties of a power supply make it provide a low-resistance path for AC signals In AC analysis you treat the DC power supply as a short. This is justified by the rule of superposition.
• 5,007

### Series/Parallel Resistor Association

Don't be confused or mislead by the diagonal "wires". Resistors R5 and R6 are tied together at each end, so they are parallel by definition. In my experience it is almost always easier to ...
• 41

### Is it possible to ignore Nyquist-Shannon theorem?

I was thinking about accumulating data and then doing some maths on this. How would you figure-out which frequency produced the samples (black dots): - Blue is over-sampled and red is under-sampled. ...
• 462k

### Best way to transfer indication signal from one STM32 to another STM32

Consider RS-485 between the two. It's easy to do, cheap, and can be made extremely reliable. One of the advantages of RS-485 over CANbus and similar is how easy it is to get RS-485 in and out of ...
• 14.4k