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  1. MP1

    motor driver L298 help

    You don't even need PWM for speed control since the input is looking for a TTL signal. You only need to change the speed of the pulse stream. MP
  2. MP1

    motor driver L298 help

    The L293 or L298 do not need PWM control. They are made for use with standard TTL signals. If you had looked at the first paragraph of the data sheet, you would have known this. Read the data sheet. MP
  3. MP1

    PCB photofabrication

    You would have to experiment around to see what the maximum exposure time would be. The light you are using is not very efficient. Do you have a place in your area that sells party supplies or lights for black light posters? There are many places where these are available. They really cut down...
  4. MP1

    PCB photofabrication

    wow, 1 hour is a long exposure time. I usually never expose for more than 3 minutes. Perhaps this is why you are getting different results. I use a light table that has 4 of the fluorescent "black lights" in it positioned approximately 120 mm above the glass. You do not need dark black...
  5. MP1

    PCB-Gold Plating before or After Mask?

    gogo, Look at a computer motherboard. All traces and pads are gold plated. MP
  6. MP1

    mixos turns 24 today!

    Happy birthday, Mike! Tip a few ouzo's!  ;D MP
  7. MP1

    PCB-Gold Plating before or After Mask?

    I have never heard of anyone plating "after" solder mask. I cannot think of a good reason to do that. At best, your plating is a cosmetic in this case. MP
  8. MP1

    PCB's... I am losing my hair !

    MOVED FROM MICROCONTROLLER FORUM Lakhan, You seem to have a problem with finding the proper forum. Please post your conversations in the correct forums. MP
  9. MP1

    FM Radio

    To All: The project schematic is back in it's original form and is correct. Anyone making this circuit should have no problems with it's design. Thanks Kyr, for joining the discussion and adding the additional comments about your project. MP
  10. MP1

    3-Axis Stepper Controller

    try here: http://www.alltronics.com/cgi-bin/category.cgi MP
  11. MP1

    PCB photofabrication

    Your spacing is 10 mil. You should be fine. MP
  12. MP1

    FM Radio

    The diode was not originally backwards. I should have looked closer after you the two of you told me it was wrong. Datasheet shows that it was in the correct placement. This is why I strongly press on members that we do not make changes unless you are actively bench testing a project. This is...
  13. MP1

    PCB photofabrication

    I use 3M transparencies. Hope you get it sorted out. I usually have no problems with traces down to 7 mil. I hate the press and peel stuff. I ask too much from it and end up with too much touch-up afterwards. MP
  14. MP1

    relay question

    You are on the right track kachew. All relays list a relay coil resistance. Just use ohm's law. You should come up with the same values as the manufacturer through calculation. MP
  15. MP1

    3-Axis Stepper Controller

    No problem!  8) Hope you will share a picture of your finished product with the group when you are done. Good luck! MP
  16. MP1

    FM Radio

    I haven't looked at the schematic for the problem yet. No it has not been changed from the original. I have only asked the original author to get involved. MP
  17. MP1

    FM Radio

    Good. I have notified Kyriakos to correct his schematic and re-post. Sarma, thanks for the correction. Since I was not following this thread, I read your post as variable cap and not varicap. If this schematic does not get corrected in the next month or so, please remind me and we will correct...
  18. MP1

    PCB photofabrication

    I have made thousands of boards using transparencies from an inkjet printer. How old is the printer? The old inkjets did not have very good resolution. You can get a new high resolution inkjet for US$50 if you shop around. I use darkest color and highest resolution. I also select transparency...
  19. MP1

    Seismic Detector?

    please post a link to the project. MP
  20. MP1

    FM Radio

    sarma, variable caps are not directional like an electrolytic.It does not matter which direction you connect. However, I do not see one in the project. Are you discussing the project in our project section here?: http://www.electronics-lab.com/projects/rf/020/index.html MP
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