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Hi circuit guys
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I am a bit unclear on one aspect of designing the system. Firstly I have a dc power suplly which produce 200V @ maximum 200A (40kW). The DC power supply unit needs 3 phase 415V input. So what is the maximum fuse should I for 3 phase AC input? Also what is the maximum current rating...
My friend has lost his asm file for PIC project but he had the codes inside his PIC chip. I have managed to read the content from device and save as Hex file. Now how can I convert the hex into readable code in terms of ASM? I have attached the hex file.
I am currently learning how to calculate the bootstrap capacitor for IR2110 Application. So far I have identified every parameters apart from one:
I use the forumla from Application Note...
I keep hearing the words such as high level and low level electronic/software/control engineering crpping up in various documents and job adverts. Can you please kindly tell me what are they? What is the different between high and low level in terms of software, electronic and control...
Dual Diode Module
I have measured my dual diode with diode check from DMM and the first reading of first diode revealed 0.4V and 0.8V on the second diode. It is clearly the voltage drop between two diodes are different. How can I tell which one of them is good or bad?
I have attached...
I am fully aware that the previous post mentioned how to test the IGBT with DMM and a 9V battery. However I discovered that a colleague of mine did further tests on IGBT which I have not seen the tests before. I could have asked him about his test but there was a time constraint as I...
I am in the process of writing my specification to cover every angle of protection microcontroller from interferences. Is there any good book or pdf describe a great deal of circuits to protect ADC channels, eliminating noise in the power distribution, etc for me to look into?
how to test a thyristor
I am currently carrying out a damage on battery charger and stumbled on problem as it would not operate. I suspected it was a thyristor and I have no idea how to test it. Two thyristors are in the thyristor bridge circuit configuration with two subbers cicuit...
I am attempting to use in-place algorithm for 4 points FFT based on radix-4. I try to work out on paper but I keep losing the 1st original data which will cause further problem.
INPUT OUTPUT INPUT OUTPUT
1 2 2 2
I have been trying to calculate FFT based on Radix-4 in Excel. Also I have been comparing my result with matlab. But I am stuck at the moment because I felt something did not seem to be correct. Please find the attached file.
Any help would be appreicate
radix 2 fft
As I am learning to implement FFT algorithm in C. I am aware some of these equations are related to buttefly calculation such as
a+bW^k and a-bW^k and cos(2PI/N)-jsin(2PI/N).
But I am struggling to understand why sin(x)*Im2 are needed in equation 1 and 2. Also cos(x)*Im2 in...
signed 8 bits
I am struggling to understand why negative 8 bit convert to 16 bit ? What about positive?
What is the benefit?
data[i] += 0xFF00; // convert to negative 16-bit
data[i] = data[i];
static dynamic load
Since physic is not my strong point, I am going to ask question in regard to static and dynamic pull test.
My vehicle weighs approximately 10 Tonnes and has managed to pull 2 Tonnes using a spring scale. I believe this regards a static pull test.
Now I intend to...
DC Brushless Fan
Recently I have measured the current pulses from the dc brushless fan runnint at 24V. Is the regular current pulse indicates one complete revolution?
If not, that I have to resort the hall effect sensor to mesure RPM
Is that correct??
Please find my attached schematic..
Assuming that 200mv goest to inverting of op-amp, I assume the gain is 1.42 hence the voltage would be 2.82V. (Is that correct?)
Can someone please tell me how to work out the voltage at pin 3 (non-inverting op-amp) mathematically...
how to calculate power factor
I am taking samples at least 1ms sample of 50Hz sine wave on 3 phase and I manage to get Vrms and Irms from 3 phase. But I am not sure how to calculate apparent power and watt.
3Ph Vrms =(V1rms + V2rms + V3rms)/3
3Ph Irms =(I1rms + I2rms + Irms)/3
I am attempting to implement load switch based on p-channel and n-channel MOSFET but I need to carry out calculation before buying or conducting experiment on. The input of voltage can be in range of 5V to 24V and the maximum load would be no more than 10A. I would be extremely...