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  1. M

    JEDEC standards

    I don't get it. What I want to do is design an 8051 system with 2 JEDEC approved 32K EEPROM modules, and a JEDEC approved 8K SRAM.  I want to do it on a single sided board. It seems that the JEDEC approved standard, just does not work with my 80C51 chip. Can anyone tell me why the JEDEC...
  2. M

    Motorola's circuit doesn't work.

    Have a look. I was trying to use it with my 8051 microprocessor. If I replace 100K with a short, the circuit 1/2 works (receives correct data) and 1/2 the time, it shuts off, turns back on, and then resets. Would capacitors help? I already have everything on a PCB and do not wish to change...
  3. M

    PCB making

    It seems that the ONLY way one can make PCB's using an inkjet printer is if multiple copies of the image, perfectly aligned are placed on the board. It appears that printing on the transparency only ONCE does NOT work. I just tried it a few minutes ago on a canon bjc-1000 printer, and as soon...
  4. M

    VU meter

    I'm trying to make my own VU meter, and I only have partial success. What I would like is full LED from full volume. My LED doesn't dance to the music :( The input is a resistor (which varies the strength) and a capacitor in series. This capacitor is connected to any audio source directly...
  5. M

    etching time

    I'm just wondering, what is the absolute minimum time one would take to etch a 10cm square board if most of it is etch-resisted by the circuit design, and the etch resist is fairly new, never heated, and the board just sits in the etching tank? why do I ask? because I rather let the etching...
  6. M

    indulis or Audioguru?

    After reading a post regarding an inductor and an oscilloscope, (somewhere in the project ideas section), It seemed that Audioguru attempted to answer the original poster's question, but then it seems that indulis made post(s) claiming that some or all of Audioguru's answers are wrong. I have...
  7. M

    my radio is changing stations by itself!

    ;D What I wanted was a radio where I can change the stations, not have it change stations itself. When I designed it on the circuit board, it worked perfectly. As soon as I placed it on a circuit board and added the digital station changer (basically a homemade R-2R DAC attached to a homemade...
  8. 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...
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