Search results

  1. billy2

    Making PCBs with magazine's paper

    Just use a good glossy paper, clean the copper surface VERY well and then apply a lot of heat and pressure for 5 minutes. Then let it soak in hot water AS LONG as it takes for the paper to come out. For the etching tank you can check out the TupperTank in the recent projects section.
  2. billy2

    How about ....

    I am in need of a second hand cheap oscilloscope !
  3. billy2

    IC question

    Yes, just drill the holes and leave the pads unrouted...
  4. billy2

    Free sample chips!

    In the request form of Maxim you have to specify the desired package type, instead of the 'no pref' option ! Of course the requested samples must exist in PDIP package, some of them are SMD only.
  5. billy2

    PCB Etching Tank - Do it yourself

    Hi Everybody ! I have started to build my own PCB Etching Tank based on the articles I am attaching here. Soon I will publish all my efforts with photos and descriptions and I am hoping that it is going to be a cover story :) :) (if Mike likes it of course) !!! EtchingTanks.zip
  6. billy2

    Absolute Newbie needing help

    In order to program the parallel port under Windows 2k/XP you will need a special driver because these operating systems do not provide direct access to the parallel port (as it was done by the OUT command in Win95/98/Me). I have found this excellent component for Delphi, which I have tested...
  7. billy2

    Absolute Newbie needing help

    Why don't you try the Toner Method ? It is very cheap and convenient down to 16 mil tracks. Read the article about 'Making PCBs with Magazine Paper' and I am sure you will like it !
  8. billy2

    A (simple) question about PSU

    I have found this schematic of a dual +-12v psu and I have a question about capacitors : I am aware that the two big 2200uF capacitors are for smoothing the transformer output and the two 10uF for providing a stable output from the regulators. But why are so many 100nF capacitors in parallel ...
  9. billy2

    Making PCBs with magazine's paper

    Forgot to say that all the traces were just 16 mil. I had to make a small and compact PCB.
  10. billy2

    Making PCBs with magazine's paper

    Well, this try was not so successful. I used EPSON PHOTO PAPER which I assumed was good. :( The picture is 600 dpi. As you can see the traces do not have a uniform width and the holes are not properly aligned. My explanation is this : The paper was not good, and that's all. After ironing I...
  11. billy2

    fine Soldering Techniques info. pls.

    Any idea WHERE we can find this liquid solder flux ? Any common brands ? It is a very good idea after etching, it makes the pcb looks really professional.
  12. billy2

    EAGLE Layout Editor question (simple)

    All right, I just insert one simple component to my board, let's say a resistor from the rcl library. Well, the default diameter and drill hole are just too small for me. I press change -> diameter and I click the component. Nothing happens. I then press change -> drill and I again click...
  13. billy2

    Free sample chips!

    You won't believe this story... :o As I have written before, I have ordered samples from some companies in order to find the best one, which is of course TI (best record : TWO days from Order to Delivery, from US to Greece). :o But today I received something which I never ordered (and still...
  14. billy2

    Build a simple PC oscilloscope

    And finally this is the best of all : I have found schematics of a pc oscilloscope that works with the PICOScope software !!! http://free-ri.hinet.hr/abacus-ri/ from this thread ...
  15. billy2

    Build a simple PC oscilloscope

    Found some more : **http://www.leonardo.caltech.edu/~ee5x/eecs52/projects/scope/scope.htm **http://www.fpga4fun.com/digitalscope.html
  16. billy2

    Build a simple PC oscilloscope

    Hi all ! After I have bought my brand new usb logic analyzer :D (have a look : http://www.usb-instruments.com/hardware-ant8.html) which I need most, because digitals is my main hobby, I am thinking of building a simple pc oscilloscope as well, rather than buying a new one, because it is not...
  17. billy2

    control RELE by parallel port of pc

    Check this as well : http://www.southwest.com.au/~jfuller/noalimba/noalimba1.htm it is much simpler, I have made it many times and works very well indeed. Don't forget the diode parallel to the relay ! If you have win95/98you can control the parallel port directly with the 'out' command. For...
  18. billy2

    Making PCBs with magazine's paper

    This is indeed a very good idea dear MP. I am thinking of making such an etching tank (because it is hard to find a fabricated one here) out of plexiglass. The problem is that I don't know where to find and cut the plexiglass. I have found some good literature in the net. I am attaching one pdf...
  19. billy2

    Making PCBs with magazine's paper

    Mixos has asked me to scan a PCB that was made with the paper toner method. Here it is ! (300 dpi). Please post your thoughts and remarks. The three holes in the lower left were enlarged (1.0 mm instead of 0.8 mm of the original) because a jumper couldn't fit, just ignore how it looks. Please...
  20. billy2

    Free sample chips!

    Hello all ! This is the crash test of the major semiconductor companies regarding their free sample service. The test trial was carried out during January and the results are the following (recipient in Greece) : GOLD MEDAL : Texas Instruments ;D Ordered : 3/1/04 Delivered : 7/1/04 Time taken...
Top