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  1. CRE

    "Soft" LED Chaser w/ acceleration?

    I agree that the narrow angle of projection can be a real PIA, but on occassion I don't mind if it gets me the color wavelength I want. I just ordered some blue 3mm LEDs which I hope come out nice and deep in color (430nm as 450nm is "true blue"). They're not the brightest only about 50mcd typ...
  2. CRE

    Sensor/Eye

    Well, first does the solenoid just turn on once? or is it on until the path is cleared? If it's the first a 555 timer setup as a monostable vibrator would work. Second, if sensed optically can the sensor/emitter be placed opposite eachother? If yes then I'd probably first experiment with a LDR...
  3. CRE

    How to control the motor

    Do keep in mind that while most DC motors will operate in either direction depending on the polarity of the voltage, that if it is not brushless or designed for such operation the brushes inside may be damaged... it's all a matter of how it's constructed of course.
  4. CRE

    "Soft" LED Chaser w/ acceleration?

    Well, my thoughts on the LEDs in an IC was that since the light isn't straight as in a laser passing it through an acrylic rod/lens should serve to blend the colors sufficiently. hmmm...... free string o' LEDs? :) Nice.... too bad about the flicker. When you post the info on the 16M projector...
  5. CRE

    LM317 circuit doesn't supply enough current (only 20mA)???

    Well, that's kinda where my thoughts were heading... As I've said before I'm a newbie with only enough knowledge to be dangerous. ;D But I recalled that they weren't all rated for 1.5A. looking at National's datasheet packages TO-39, LCC and TO-252 are only rated for .5A. But I was just curious...
  6. CRE

    Garage door Status Indicator

    I personally would recommend against a switch dependant on the garage door opener's operation. I would recomment placing something along the lines of 6" to 12" of strip magnet on the door and a reed switch on the inside frame. This way if someone were to pull the release and open the door...
  7. CRE

    LM317 circuit doesn't supply enough current (only 20mA)???

    Hi everyone, I was just curious, mac72, what type of LM317 have you got (I'm referring to the package)? If you don't mind the brand and suffix would help as well. Thanks.
  8. CRE

    PC Oscilloscope

    well, if a few other want to verify the design I'll give it a shot on my backup PC.... I'll also need to know where to get software for SuSe Linux though. I'm not trying anything untested on my main PC. Theory is one thing.... I've had a lot of them.... ;D The product can sometimes be quite...
  9. CRE

    I have a couple of questions:(

    Woohooo..... Somewhere I can help! As Yevgeni mentioned another name for an opto coupler is a phototransistor, it's a type of optoisolator. In a lot of cases I've found the 4N25 to be sufficient for my needs. What we need to know is how many LEDs and their specs. You might need to use the...
  10. CRE

    recorded voice player

    Well, the tape option would work, but wouldn't that require a LOT more in the way of components, space and overall power? A COB might not be a bad idea but I couldn't begin to tell you where to go to get that designed, much less produced cheaply... Unless you're planning a full production run...
  11. CRE

    "Soft" LED Chaser w/ acceleration?

    You know oddly enough I have yet to burn a transistor out... :o As for the LEDs well, that's what I get for not paying enough attention. Thanks for all the suggestions Audioguru, and I look forward to more on that circuit of yours. I was interested in doing something similar using a 3 LED IC...
  12. CRE

    "Soft" LED Chaser w/ acceleration?

    Yup, I saw the "mood light" ;) I'm familiar with basic concept, I've made a couple circuits that'll fade an LED using a dual or quad opamp, but what I want is to fade 3 or more in sequence. I'll try out the cap and transistor when I get the parts. This circuit would most likely be used for...
  13. CRE

    PC Oscilloscope

    Is an optoisolator out of the question? I figure you'd need to add some sort of control to adjust the gain on the transistor side of it and how about the sensors? Do they have to supply any voltage or signal or is everything supplied by the test circuit? In which case you really just need to...
  14. CRE

    "Soft" LED Chaser w/ acceleration?

    Thanks for the reply Audioguru, I don't have all the parts to experiment with yet (gotta order some more LEDs). I'm ordering from DigiKey and they list two "series" of 4046; CD4046*, and 74HC4046* does it matter which one I use? Now back to the fading, how do I go about using a cap to produce...
  15. CRE

    PC Oscilloscope

    Thanks for the reply Dazza but the link's either broken or the server's down... I'll try it again tonight. Although I really don't think I need anything very complex, just a small circuit to isolate the soundcard/PC from the test circuit. I'm too new to oscilloscopes to know what can and can't...
  16. CRE

    PC Oscilloscope

    I'm also interested in making one of these, but out of fear of frying my soundcard I'm hesitant. Does anyone possibly have a schematic for one which makes the use of an optoisolator? I don't anticipat working on anything which requires more than 18v (for the circuit) that I'd need to test so I...
  17. CRE

    "Soft" LED Chaser w/ acceleration?

    Hello, This is something I've been trying to figure out the logic of.... I'm lost. :-\ There are two additions I'd like to make to a LED chaser similar to those which commonly us a 555 and a 4017. The first is I'd like to make one where each LED slowly fades on and then slowly fades off...
  18. CRE

    recorded voice player

    The ISD's use non-volatile memory (EEPROM) so all that you would need to do as far as I can tell is connect a mic and record button long enough to record the desired sound.... then remove the two and insulate the record pin to prevent it from grounding. I'm just a newbie with alot of this so if...
  19. CRE

    E12 Resistor Series

    Thanks again Ante, Anyone know of any other values in the E12 (or even E24) range which has two valid codes?
  20. CRE

    E12 Resistor Series

    Thanks for the prompt reply Ante. Ok, so there isn't one that's "right" or "standard"? Has anyone here come across either or both? (I'm making a chart and labels for my organizer... ;) )
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