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  1. Kain

    Driving IGBTs

    I want to build an H-Bridge with IGBTs since I got quite some here and I'll be switching about 15A. Now, the low side of the H-Bridge is easy to drive since potential that appears on the gate is basically the same as Vge assuming that I connected E directly to GND. However the high side is a...
  2. Kain

    SERVO THROTTLE SIGNAL

    Wow, it's been a while since I visited the forum  ;D, but anyways. I got my hands on a brushless DC motor as well as the controller for it and I wanted to use it for a non-RC model applications, so obviously in order to drive it I will need to emulate the same signal as the one a receiver is...
  3. Kain

    IGBT and MOSFET drivers???

    Hi again everybody
  4. Kain

    USB to LPT Adaptors

    I just received my FPGA board from Digilent and besides the fact that it looks nice I noticed something that I don't like at all - it came with LPT programming cable. Well LPT is a dying standard as we can all see - new PCs or laptops don't even have one anymore and this is my case, as well. The...
  5. Kain

    EPROMs and "Don't Cares"

    I am really curious if EPROMs or EEPROMs allow for "don't care" conditions. Any ideas?
  6. 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...
  7. 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)...
  8. 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...
  9. Kain

    Phase measurements and time base.

    Hi again. I have been playing arround with the scope lately and it is not too hard to figure out that in order to make a correct phase difference measurement when we feed 2 signals we should always have the same time base, and this is where I wonder
  10. Kain

    CMOS 555 BURNS???

    Here is a circuit that I tryed yesterday. I first tryed with NE555 which is the regular 555 timer but then I wanted to have less power consumed so I decided to try with TLC555 which is same timer but CMOS (LINMOS) version from Texas Instruments. While the NE555 seems to work ok, the TLC555...
  11. Kain

    ACHIEVE LOW ESR CAPACITORS...

    Hello again, I was reading lately about swithing PSUs and noticed that they require a low or ultra low ESR capacitors in general. I have checked on different manufactors but I read that a ultra low ESR can be achieved by connecting smaller capacitors in parallel. I looked in google for some more...
  12. Kain

    ORCAD SYMBOL IN LIBRARIES...

    I was just trying to get little by little into ORCAD by trying simple simulations and I run onto this circuit on the picture. It's more than simple, but the problem is that I have no clue where I can find this double arrow symbol for node out? Does anybody here knows which lib contains this...
  13. Kain

    Dual CMOS based timer problems...

    I have built a timer circuit based on CMOS 4538 which consists of 2 monovibrators. I am getting some sort of problems, such as bouncing and wrong timing. Do you see anything wrong with the schematic that i posted because I don't see it. Maybe i overlooked something... There is no noise in the...
  14. Kain

    12V / 5A Transistor Switch

    Recently I had to use some 12V electrical clutches that draw about 4A continuosly under operation. I wondered if I can make a simple 1 transistor switch that can take this whole load? I was thinking of common collector configuration with zener stabilizator in the base. I do not care of any...
  15. Kain

    Step-up PSU with TL499A

    I have been trying to build a low power step up PSU for my PIC programmer. It is supposed to take 5V DC and convert it into 20VDC. The load takes about 50mA. I tryed to achieve it with TL499A, and on first sight I think the schematic and the board look good. However, when I built it it seems...
  16. Kain

    Protel DXP vs Orcad 9.1 or 9.2

    So far I have been using only Protel for my simulation and design purposes, but since now it seems I will be studing Orcad in university I wonder which one can be thought as a better software and if it is why would that be? I know it's all about personal oppinion in most cases but I've never...
  17. Kain

    Choice for digital oscilloscope?

    It's been a while for me walking arround and asking to use scopes so I finally decided to buy one, not to mention that I got some cash specifically to buy a scope. Now, the 2 models that I looked at and that I can afford (digital ones) are the Tektronix TDS210 Digital Oscilloscope and Instek...
  18. Kain

    Wireless USB adapter high gain antena

    I got myself a wireless G USB adapter. Reason why I wanted USB one is because it can be used pretty much on any PC - notebook or desktop vs. PCI or PCMCIA cards which are restricted to either desktop or notebook. Anyways, as expected USB adapters sacrifice something because of their compact...
  19. Kain

    CMOS based timer bouncing

    Hello, recently I did some CMOS timer design and it was working fine until we tested it in combination with some other relays. When we did this it started bouncing like crazy, so I think it is typical example of industrial noise influence :-[. Now I tryed to deal with it by putting optocouplers...
  20. Kain

    UV exposure and white LEDs?

    When using the photo-exposure method to transfer the artwork, we all know that it has to be perfectly alligned especially if we are making double layer boards. Since this cannot be done under regular light as we all know, I wonder if it can be done under light emmited from white LEDs? The reason...
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