Search results

  1. Kain

    Step-up PSU with TL499A

    Hum... Am i supposed to solder those with low voltage soldering iron?
  2. Kain

    Step-up PSU with TL499A

    I just tried it - doesn't help at all. You ment the capacitor to be between the input and ground, correct? I used 1000uF cap to try it  ???
  3. Kain

    Step-up PSU with TL499A

    Congratulations for the 3000 posts (already 3004). Is there going to be a party too? ;D About the step-up PSU - i tried setting the current limiter to 350mA and yet exactly the same as before happens. Sometimes actually the board fires up, BUT I am unable to regulate the output trough the...
  4. 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...
  5. Kain

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

    Alrighty, I have already built the modified PSU. I haven't done much testing though but I noticed that the maximum voltage was actually 28V instead of 30V. Any idea why this would be? Here are 2 pictures of it assembled  ;D
  6. 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...
  7. Kain

    Choice for digital oscilloscope?

    Ok, it seems I will have to answer myself. I would take the Tektronix because it does 1Gs/s up to 60MHz on each channel vs. the other one which is capable of only 100Ms/s on each channel. The Tektronix has some additional functions that will come up handy too. Amen
  8. 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...
  9. Kain

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

    Ok, finally some late update on this project. I assembled the dual layer PCB today - as expected it's really compact and neat
  10. Kain

    Our Site Doesn't Open

    Yey! Finally back in ;D. I can't believe I survived those hours without the site running. It's still slow though. Maybe it's not over yet? ???
  11. Kain

    Wireless USB adapter high gain antena

    Alrighty, I will try to attach an antena to SW1 somehow and hope this will do it. On touch actually it does make a huge difference, I mean when I touch SW1. Thanks anyways. :)
  12. Kain

    Running LEDs at PWM and current sensor Q.

    Audioguru, you are right in general but the things change when you decide to use high intensity white LEDs or high intensity LEDs in general. I have about 100 of those still left over with 20000mCD intensity, and about 10 more with 13lm flux. When you actually overdrive the 20000mCD ones on...
  13. Kain

    Running LEDs at PWM and current sensor Q.

    Hi Inspar8r, welcome to this forum. I have done what you are trying to do with the PWM and I used exactly 555 timer. The timing components you can calculate very easily. You can either look up in google for 555 timer datasheet since they will provide you with all the information on the different...
  14. Kain

    Wireless USB adapter high gain antena

    Oh, I forgot to post the pictures of the adapter. It seems this small rounded component is the antena it is having right now. The wireless controller is obviously the ZyDAS ZD1211 on which I can't find any detailed documentation such as suggested schematics, but this is not that important for now.
  15. 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...
  16. Kain

    3 stage timer design

    I did some timers recently. I highly recommend you CMOS 4538. This thing is really accurate given you have good accurate RC, meaning within good tollerance. The C has no limit and R can be up to 1M Ohm and the formula to determine the timing interval is T=RC. This is more than simple. The chip...
  17. Kain

    CMOS based timer bouncing

    Ok, here is the big no no I did on the PCB - I have traces passing between the pins of the ICs... Don't comment me pls ;D. The other thing is that some of the traces (I just didn't want to say all :-[) are pretty long for CMOS based circuit. And the really big no no was powering them up at 5V...
  18. 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...
  19. Kain

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

    Yea, I dunno what was wrong with me. I found 10000uF/63V for 5$ each at mouser, so total is going to be 25$ which is acceptable ;D. About the transformer I don't recall saying it costs 10$. I would really like if it was 10$ though....hehe. The one I am getting will be hammond 30V @7.5A for...
  20. Kain

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

    I was just collecting the parts for this project and the price of C1 almost killed me - it costs as much as the transformer... Do you think I can use the same value capacitor on 50V instead of 63V, since it's almost half cheaper then the 63V one? Or maybe somebody knows a place where I don't...
Top