Recent content by DjMadness

Hello berkeman I'm sorry for not being clear. I think your second explanation aims at my point: to describe magnet North and South. It's a school educators project: you should design two differently charged magnetic boards, then attach a small magnet under alphabetical letters. The teacher...

Hello I have magnetic sheets A4 sized that could be bent but not enrolled, having a thin thickness. I want to cut them in a circular shapes. The idea, is there any possibility to make one of them (or other material same physics) positively charged and second negatively charged; then have...

Dear Dave, No matter what professional you are, if you read right the description I've wrote before uploading the image you can comprehend what I was talking about. Symbols are after all tools to ameliorate comprehension. A non polarized capacitor, generally a ceramic capacitor in electronic...

Hello, Excited to design, using relays, corresponding switches and timers, a control diagram that has a function as follows: When user presses the push-button, a lamp turns on and remains that way (self-latched). After a small time delay when the user re-presses the same push-button the light...

Dear old Jim, It was a metaphor or equivalent. Please tell me how to add images via private messaging. <Beside adding image URL, and if having image on the hard disk> Thank you

Dear old Jim, Your references, and explanations are vociferous! Let me ask you at the moment about a switch, driven by PIC, that connects/disconnects caps according to code. Popular one, is about Open-Relay Switch, but it is cored on Relay, that in turn have mechanical moving part. I want to...

Dear old Jim, Since the total resistance in the choke "load" is too high, and could result in several milliamps drawing, can I make its resistance lesser, by using parallel resistors with the choke? In this case 50/diminished R would have a significant value, to be noticed especially when...

Dear old Jim, I did all this, but on the primary side to the transformer, because I have no access to a variac at the moment, and therefore I cannot supply the secondary with 50VAC. Using your methodology, I've found that primary inductance is of 8H which is tooo big. Even thought I`m not...

Dear old Jim, Hi Following is the secondary of a 220/50VAC transformer: This is the intended choke to be used as a load, when fed by a 50VAC source. The problem is that I don't know its Henry's value, and no inductance function exists in my multi-meter. How can I know its L[H]?? Beside...

Dear old Jim, Things got very confused to me. What do you mean by "try your fan motor"? You mean use it as the choke? Or do the power factor measurement on it? Suddenly I`m not able to understand anything I don't know why...Too many theories, too many real circuit problems. Can you advice me...

This for sure cannot withstand a 50VAC. This for sure cannot withstand a 50VAC.

This is the image of the 50mH inductor:

Dear old Jim, We are in trouble! I think that my previous posted circuit makes no sense! Once fully charged, an inductor plays the role of a wire, that means when I shunt connect it to 50VAC voltage source, this would be a form of short-circuit. On the other hand, how come a single inductor...

Simply, a resistance does not get affected by frequency. Inductive reactance could be understood as a frequency dependent resistance. There are other large explanations about reactance and equivalent phasor representation but could minimally understood by previous phrase.

Dear prof Jim, I have no access for uploading any image at the moment unfortunately. The resistor in the supply leads (0.01R) is neglected. It is only concerned for the simulator to work with. I need the correct power of the 4.7R resistor to maintain the 3Amps drawn by this circuit. Also I...