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  1. MP1

    UV Exposure Unit

    If the tubes are spaced too far apart, you could get striping on the board. Mine are as close as I can get them, which is a few inches apart due to the width of the fixtures. What I refer to striping is where bands of light are more intense and develop better than the other parts of the board...
  2. MP1

    Power Supply - looking for 200pf capacitor

    alun, audioguru: No discourage intended to audioguru, and I would hope no offense was taken...in fact, I was trying to "encourage" poschi who has purchased parts and worries that his project might not work. Go for it, poschi! BTW: alun, consistency? Not with this many newbies behind a solder...
  3. MP1

    Power Supply - looking for 200pf capacitor

    Several other members of the forum have reported that they have built the original with no problems. I would call the other thread, which is too long for any new members to care to read, as improvements on the design rather than fixes. MP
  4. MP1

    time beeper

    I have seen other similar comments on this forum in the past regarding CMOS voltage. These CMOS devices work fine in the 3 volt range and a little under. I think much of this misconception has come from working with TTL devices and perhaps older battery technology. Also note these devices only...
  5. MP1

    [README] Please read this before posting in Projects Q/A

    This area is for questions and comments regarding the projects in our "Projects" section of this website. These can be accessed with the blue button at the top of the page. For questions about something you are wanting to design or other circuit requests, you should post in the Circuit General...
  6. MP1

    Drilling PCB?

    That is correct. You can check your pc board layout to see what sizes you actually need and narrow down the need for many sizes. For example, sizes which are close can be edited and you might only need 2 or 3 different sizes.  Maybe less. You might also want to employ a magnifier with a light...
  7. MP1

    Drilling PCB?

    A dremel is great since it runs at high speed in the 30,000 rpm range. This will give your bits additional life. It will also give you a nice clean hole. Slower drills will actually burn the pc board material and give you a discolored hole. Some type of fixture such as a drill press will keep...
  8. MP1

    Electronic Stethoscope

    This is where I get off the merry-go-round.... MP
  9. MP1

    Electronic Stethoscope

    The low pass you have put on the front end of your revised circuit kills any noise specs that might show up. Noise is found in the higher frequency ranges. That is why many music noise cutting circuits employ low pass features. Many noise gates are high pass cut circuits and noise removal on...
  10. MP1

    time beeper

    is it the one from our site? "Timed Beeper" http://www.electronics-lab.com/projects/oscillators_timers/008/ MP
  11. MP1

    Electronic Stethoscope

    Noise specs reallly don't mean much in a circuit that gives you a beep beep or a thump thump. Now if the person has swallowed a radio, and you must hear the football game or latest concert, then I agree 100% to the updated op-amps.  Make 2 such circuits for stereo effect.  ;D Have fun uh3455! MP
  12. MP1

    Inverter Circuit 12V DC to 230VAC Sine Wave

    There is some information on winding transformers in the Articles section of this site. MP
  13. MP1

    Wind power generator project

    You will need some type of control to stay in the wind. For a simple lightweight version, you might be able to use a vane. Larger units are motorized and use a wind sensor for feedback. Ante, in your last post you mentioned two steppers positioned with one always in the other's half step...
  14. MP1

    Reduce DC voltage, How? please..

    The data sheet does not specify a resistor (R1) between Vout and Vref for either LM117 or LM317. The resistors used in the various examples are just that. "Examples". The formula is Vout=1.25V(1+R2/R1)+Iadj(R2). MP
  15. MP1

    Amp trouble

    Since you have the schematic, you should be able to answer this question better than someone who has the same model amp. Most likely they are not going to have a clue about the color code of the internal wires. Post the schematic or the part in question so that someone can see what you are...
  16. MP1

    What are all NES and SNES

    NES are those things on your legs, sometimes spelled "knees" and SNES is what happens when your nose blows....sometimes spelled "sneeze". oh yeah, and ante is right, too... ;D ;D ;D ;D ;D MP
  17. MP1

    Google before posting

    Have you noticed that sometimes google brings you here? It is a little humorous to me that someone on this forum might say "go search google" and the search brings them back here.  ;D We also have a search engine for posts on this site. Maybe it will be easier for some who get confused on...
  18. MP1

    wireless USB data

    I recommend that you start here: http://www.rfdigital.com/ Lots of choices. MP
  19. MP1

    Design Steps in Big Companies!

    ...sounds like a "Projects Design/Ideas" kind of subject to me...    ;D ;D MP
  20. MP1

    time beeper

    binkibir, This area of the forum is for questions about projects which are in the projects section of this site. Where is the time beeper? I can move this thread to the appropriate area, but you will need to post a link so that members can help you. MP
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