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  1. Kain

    Ante 50 Years Young

    Happy Birthday Ante. Thank you for helping us all in here. I hope you had a good one, or are still haiving it
  2. Kain

    Scope calibration service???

    I have already tryed this, and it does not help. In fact this behavior persists even if I have no probe connected at all...
  3. Kain

    Scope calibration service???

    Well, so far I have only used it in home and my boss's place and it acts in the same way in either place. I haven't really dig the ground and put some salty water to kill anything that I get my hands on  ;D but given that I have used it on 2 different places and it acts in the same way should...
  4. Kain

    Scope calibration service???

    Do I get this right or there is no place arround here? I checked for few services but they are all online... and I don't exactly like the idea of shipping the scope to a company , especially outside of CA. C'mon people, if you don't know a place at least say "I don't know"
  5. Kain

    Scope calibration service???

    I was just having fun with the PSU from: http://www.electronics-lab.com/forum/index.php?topic=196.0 and tryed to measure the ripple again. Well I noticed something that I didn't pay attention to before - the scope is actually measuring some p-to-p voltage of about 200mV when used on 5V scale...
  6. Kain

    Convert 0-30V 3A PSU to 5A or more

    Ok, I thought so about the feedback but wasn't sure - no enough time to analyze this circuit anyways, but this is why we have Audioguru here  ;D! I measured the negative input of U2 and it was quite enough to force the output to max so it does make sence. I am about to replace the 3 power BJTs...
  7. Kain

    Convert 0-30V 3A PSU to 5A or more

    I actually found the problem. As I said I was assembling the PSU and what happened was that one of the 2N3055 was not hooked up correctly. I exchanged the base and the emmiter so when I loaded the PSU on 7A I blew all of the 2N3055 transistos and the TIP31A one (Q2). I think I might have blown...
  8. Kain

    Convert 0-30V 3A PSU to 5A or more

    Ok, I finally managed to blow this PSU up. I burned Q2 and it was quite obvious since R15 begun to smoke. The output current was 7A at 2V when this happened. Any idea why it burned? I haven't replaced Q2 yet, and I don't wan to if it is going to burn on me again since this is not a fix...
  9. Kain

    0-30 Vdc Stabilized Power Supply

    Hi fish2005, I am not sure if the dual power supply is also floating. One can think of the common as floating but in the case of laboratory PSU the common is very often ground as well, and as ground I mean earth. Even if it is not, the center point is called ground and positive and negative...
  10. Kain

    Convert 0-30V 3A PSU to 5A or more

    I know that this is a bit out of topic since it is not directly related to the PSU, but can anybody here suggest a good CAD to draw a cover label for the face pannel of the PSU? I finally put it together - now it is going all the way to 30V/6.9A with fan cooling. The ripple problem is solved -...
  11. Kain

    Transformer Winding Sequence Question

    Thanks for the reply - it surelly was a good information. What does the information on the LITZ wire in parantesis indicate though (e.g. 1X15X,1)?
  12. Kain

    Transformer Winding Sequence Question

    The article where I took this data from is basically the application of HID lamp controller made by TI. There is an inductor and a transformer that I am willing to try and build but one problem is that I don't quite know where I can buy the transformer core from. Here is the article in PDF. The...
  13. Kain

    Transformer Winding Sequence Question

    I was looking at some SMPS and saw the informaton about the winding sequence of the transformers and inductors. Can anybody here explain the meaning of the information below? This is what is typed in the datasheet: L2 RM10PA250-3F3 PHILIPS 10T PRIMARY LITZ(2X10X,1) 60T SECONDARY LITZ(1X15X,1)...
  14. Kain

    signal waveform generator

    Oh ok. It seems like the best of the 3 is the MAX038 anyways. Good thing I got it as sample some time ago  ;D
  15. Kain

    signal waveform generator

    Audioguru, where do youfind datasheet for XR20x6? I tryed to google it, but nothing came up... ::)
  16. Kain

    LC circuit

    One more thing - I recommend you to experiment first with transient responces of RC and RL circuits so you can notice few things, sich as inductors are dead short to DC once they build their magnetic field and capacitors act as nearly open circuit once they charge up. Cheers  :)
  17. Kain

    LC circuit

    Connecting a stright wire and an inductor is not the same thing. A wire has some ammount of inductance but it is very small on first place. Another thing to consider is that every wire that you get your hands on has some resistance - it's a resistance derived from the resistivity of the material...
  18. Kain

    Bridge Rectifier

    To get 12V rectified you will need a step down trasformer to get 12V AC and then you use full wave bridge rectifier (if your transformer does not have center tap) to get these 12VRMS to DC voltage. Keep in mind that the output will be the peak voltage of the secondary - 2 X Rectifier Diode...
  19. Kain

    Simulation Models Creation...

    I just downloaded TINA - it has few things that DXP doesn't, such as 555 simulation. I also found the simulation model for TLC555 which is the linmos version of the 555 timer chip, but yet I cannot figure out how to create the simulation ready part  ::) Ok, I understand that we can get some sim...
  20. Kain

    Simulation Models Creation...

    I've been playing arround with DXP2004 evaluation software lately and with Orcad student edition, in particular with simulations  ;D. I've noticed one thing for DXP 2004 but I assume that it is the same for any simulation software out there - we have limited number of simulation ready parts...
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