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  1. W

    Creating a perfect PCB with toner

    Yes, the process is very easy, here some photos of my board, so easy and you dont have to try "x" times, just put the board under water and it's done, can't be more easy than this, and is very cheap.
  2. W

    Creating a perfect PCB with toner

    I did my board with cloths Iron also, it took about 2 min to transfer the toner, and like the photos in that link, the design came out perfet.
  3. W

    Simple O2 meter with LM3915

    Thank you audioguru, the 20k resistor it's on the other board. ;)
  4. W

    Creating a perfect PCB with toner

    I've done this today, it works fine, it took me about 30 min to make the board. The pages that i use do not absorve the toner, you can remove from the pages with your fingers if you want to. The transfer process took about 5 minutes, very fast and clean.
  5. W

    Creating a perfect PCB with toner

    The good thing is, it works very well http://myweb.cableone.net/wheedal/pcb.htm
  6. W

    Simple O2 meter with LM3915

    Thank you audioguru, i will build the circuit and i let you know. ;D
  7. W

    Simple O2 meter with LM3915

    I've found this schematic to use as a base: Just need to figure the LDR part.
  8. W

    Simple O2 meter with LM3915

    Hello Audioguru, i've sent you a PM. Scroll down the PDF to see the conection to the LDR! Thanks!
  9. W

    Simple O2 meter with LM3915

    Project files attached below. O2_project.zip
  10. W

    Simple O2 meter with LM3915

    Hello guys, after a few months (problem to find LM3914 around here) i've build the thing, but is not working :( Attached to this message is the full schematic and board design and the Eagle project files. Problems 1- When i turn the device on, the 10th led lit and stay fixed, when i turned off...
  11. W

    Simple O2 meter with LM3915

    Does any one know or have any idea how o make the "Bar Display with alarm flasher" work with this configuation?? Because the design is too big already, i did have an idea to add to this circuit, a few extra 4148 diodes and a 555 so when the especific led turn on it will trigger the 555 to flash...
  12. W

    Simple O2 meter with LM3915

    Using LDR will be like "plug and play" so you don't need to mess up with the car cables. But the circuit is not ready yet, something must be done with the second LM3914, after that i still have to make the circuit blink or buzz when it reaches a certain level.
  13. W

    Simple O2 meter with LM3915

    Trying to do a nice thing here, adding this LDR so when we have day light the display will be brighter and dimmish at night. I think this wil do.
  14. W

    Simple O2 meter with LM3915

    Here is the incomplete schematic, looking the web to see if i could use a 741 at the input and define the values.
  15. W

    Simple O2 meter with LM3915

    Here is the schematic for the voltage regulator, now to the LM3914 part....
  16. W

    Simple O2 meter with LM3915

    Hello Audioguru, sorry, not Wilson but Wellington ;) Long time no see Audioguru, how are you?! You don't have that schematic around, did you? I was thinking the same about the input protection for the 7805, true is, i was thinking in using a 7806 instead to compensate the output protection also...
  17. W

    Simple O2 meter with LM3915

    Yes, i got it! I have a few LM3914 here ;) I'm working on the schematic right now, the worst part is the "heavy filtering" part because the signal is only 1v max, there is the alternator part that can blow the regulator off (some friends os mine did that).
  18. W

    Simple O2 meter with LM3915

    Hello audioguru, when you say "need heavy filtering" what do you have in mind?
  19. W

    Simple O2 meter with LM3915

    Hello Capitain! Or should i call you General ;D Thanks for the schematic, there is a lot os these on the net. I want to try building one from scratch but if everything goes wrong i might use yours as reference! Audioguru knows me better when i pull out the stunt with 2 LM386 in a circuit that i...
  20. W

    Knight Rider with Halogen Bulb

    But a "flash trail" means that the output transistor will be operating as a linear amplifier and getting very hot. You could do it with PWM and it would remain cool. No, no,  no, what  meant to say was to make the same effects with 4017 and LED's ;)
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