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Recent content by Zerosum

  1. Z

    Is it normal for an opamp to "rectify" a signal?

    Hello, Sorry, I meant to reply to this sooner! Your explanation of the potential to damage a scope makes sense, I will certainly pay more attention to that in future! Am I to infer then, that connecting just one scope earth at a time would be safe? This circuit is more of a concept...
  2. Z

    Is it normal for an opamp to "rectify" a signal?

    Uh oh, it's possible to destroy a scope that easily? Wouldn't it have some kind of internal overvoltage protection? I have a cheap multimeter that has a removable fuse, surely a relatively expensive scope would have something similiar? In any case, i'll certainly be more careful in future! I...
  3. Z

    Is it normal for an opamp to "rectify" a signal?

    Hello, wow, thanks for all of the helpful replies! I actually just got this circuit to work, I think I was connecting the two oscilloscope ground leads incorrectly? I have one lead connected to the input, and one to the output of the op amp, and when I changed their position I get a full wave...
  4. Z

    Is it normal for an opamp to "rectify" a signal?

    Hello, This is the schematic that I am using: http://electro-music.com/forum/phpbb-files/whitenoise_969.jpg I hadn't tried using a split power supply for the op amp, I should have thought of that! However I just tried it, and it didn't seem to make a difference? I was still getting a half...
  5. Z

    Is it normal for an opamp to "rectify" a signal?

    Forgive my poor understanding of this subject, but I have built a simple white noise generator, which is working. I then fed the signal into a UA741 low-noise opamp. The signal was indeed amplified, as I expected, but I now only get the upper half of the waveform, the opamp seems to be cutting...
  6. Z

    Working on getting a Pierce Oscillator to Oscillate

    I think I'll try some more Colpitts circuits myself, maybe the Pierce is just a bit hit or miss? On another note, What do you guys think of this oscilloscope...
  7. Z

    Working on getting a Pierce Oscillator to Oscillate

    Thanks a lot CDRIVE, I will build that one later, and see how well it works. I am convinced I am doing something obviously wrong, it can't be this hard to build an oscillator, can it? They are relatively simple circuits...
  8. Z

    Working on getting a Pierce Oscillator to Oscillate

    Thank you very much, I had a good look at those links. I will try the CMOS inverter one when I get the 32khz xtals I ordered. I found this circuit: http://www.hqew.net/files/Images/Article/Circuit_Diagram/pierce-quartz-crystal-oscillator-circuit.gif For a 2Mhz crystal, which I will try...
  9. Z

    Working on getting a Pierce Oscillator to Oscillate

    Hello, I tried the radio again, and I got nothing at all, the sound didn't change anywhere. I also tried removing the crystal, and the waveform I was getting didn't change, which indicated that the crystal is not doing anything. Steve, 10Mhz is quite similiar to what I am using, so I think it...
  10. Z

    Working on getting a Pierce Oscillator to Oscillate

    That's vey kind of you, thank you! I ordered a few 32 khz crystals from eBay, so I'l try those once they get here. I have a few other caps I can try as well.
  11. Z

    Working on getting a Pierce Oscillator to Oscillate

    Steve, I think I might do that, just to test the circuit. Would the values of the components change if I get a crystal at a different frequency? If the 3.3 mH inductor is the correct value, it seems my hacked scope is the issue then... I think I will just go and buy a simple one, I'm sure it's...
  12. Z

    Working on getting a Pierce Oscillator to Oscillate

    I tried with 6V, and there was no sine wave, but I still get my strong, regular wave. I took a screenshot of it, if it helps:
  13. Z

    Working on getting a Pierce Oscillator to Oscillate

    Unfortunately my multimeter doesn't seem to have a frequency function, just current volts and resistance. I tried several times with a small radio, putting the aerial right up to the circuit and slowly moving through the frequences, but couldn't hear anything but normal stations and static...
  14. Z

    Working on getting a Pierce Oscillator to Oscillate

    That's what I was thinking too. I read somewhere that a PC scope can only handle about 44 Khz or so?? It may well be working, I just didn't want to drop a fair amount of cash on a piece of equipment unless I knew I needed it. When I turn on the power to the circuit, the pc scope does immediatly...
  15. Z

    Working on getting a Pierce Oscillator to Oscillate

    Hello, I am fairly new to electronics, and I am trying to build a very simple crystal oscillator circuit, to use with some radio experimentation that I intend to do. The simplest crystal oscillator seems to be the Pierce oscillator, and that is what I am trying to build. I've tried many...
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