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  1. M

    PCB photofabrication

    I tried again and this time it works. It must be the timing.
  2. M

    PCB photofabrication

    I just bought a blacklight from Spencers. It is similar to the model at the following URL: http://www.spencersonline.com/index.cfm/fuseaction/products.detail/categoryID/4c03fc90-c45d-43ab-9664-11034dcbf79d/productID/30443747-4c20-40e7-8ed2-c81920107086/ I used it to try to expose the board...
  3. M

    PCB photofabrication

    according to several documentations, they suggest between 20 and 30 minutes. 3 minutes is very short. I don't have those kind of lights. What I am using is a halogen light that is commonly available. so what you are claiming is that my current light source is almost useless. this isn't light...
  4. M

    PCB photofabrication

    I was wondering if I used the transparency, pass it through once through the printer, and create a longer exposure time, would that make a notable difference? My exposure times are usually one hour, but if it is worth it, I am willing to up it to at least 3 or 4 hours.
  5. M

    PCB photofabrication

    almost fine. I chose to increase the spacing since I am opting for cheaper medium. The circuit will print perfectly, but not dark (or solid) enough to make a practical PCB if I use a transparency. I have a standard blank sheet of printing paper, but I don't know if that will work because it...
  6. M

    RF transmitter

    I also like Audioguru's version better than the original version, because a +ve and -ve pole is much better defined. If one pole is missing, no circuit will function. Its just the same as connecting the -ve end of the battery to the circuit and leaving the +ve end in mid-air.
  7. M

    PCB photofabrication

    no, but according to a few articles that I read about it, it requires more effort than using the transparency method mentioned here. Also, Press-n-peel is not available in any local electronic store. If I understand you correctly, then this method is ridiculous. If the solder side is NOT...
  8. M

    PCB photofabrication

    I need to learn from you. about 5 years. My printer uses a parallel port. It doesn't support USB. I don't think my printer qualifies as an "old inkjet" if sometimes the transparency works. The major problem I have with using a transparency is that the second copy of the same image does not align...
  9. M

    PCB photofabrication

    Until now, I was using transparencies as the media to put my PCB artwork on in order to complete the photofabrication process. The PCB works excellent with a transparency, BUT, in order for this to happen, the artwork must be excellent. In most cases, it is not. When I pass the transparency...
  10. M

    Theory discussion moved from Q/A

    You know, transistors can smoke alot easier than that. :o  Just be an idiot when connecting them. In fact, if you connect the base of the 2N3904 to the positive of a high DC voltage source and the emitter to the negative of the same source, I can guarantee that it will malfunction. In fact, I...
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