Hello everyone I am looking for usage of RC oscilators but sadly I cannot find them anywhere. That is why I decided to post there my question.

Please provide an answer for all future users of this Electrical Engineering Stack.

The question is:

What are the usages of RC sinusoidal oscilators?

Please post not only the one usage but the list of them.

EDIT: The usages which I found:

  1. They are used to generate low frequencies ( mainly audio ).

  2. Used in audio signal generators and in electronical music instruments

Thanks in advance for your help :)

  • 3
    \$\begingroup\$ Where did you hear of RC generators? What do you think they do? Your question will be closed unless you improve it significantly. Show your research. Can you name any use for one? \$\endgroup\$ – Transistor May 8 '16 at 11:47
  • \$\begingroup\$ What's a RC generator? \$\endgroup\$ – Marko Buršič May 8 '16 at 11:55
  • 1
    \$\begingroup\$ Ok so in english it is named RC oscilators. \$\endgroup\$ – FieryCod May 8 '16 at 12:05
  • \$\begingroup\$ @transistor Thanks for your response I did some research before but I did not provide the proof so I edited my question. The problem is that I need more examples of it's usage. \$\endgroup\$ – FieryCod May 8 '16 at 12:13
  • 1
    \$\begingroup\$ LOL! Just saying it's not homework is completely meaningless. On top of that you didn't actually say it wasn't homework, not that it would matter anyway. The professionals here got their degrees and did plenty of homework in the process, so can spot it quite well. We know homework when we see it, and your question is just screaming "homework". \$\endgroup\$ – Olin Lathrop May 8 '16 at 13:06

Its not true that RC oscillators only generate low frequencies... In microcontrollers, many has internal RC oscillator running at 8Mhz then larger frequencies are obtained by a PLL circuit. The RC internal oscillator is used because it is easy to be implemented by the chip manufacturers, but the reason why its uses are limited is because of its accuracy (capacitance and resistance tend to drift mainly with temperature). pic18f series with internal oscillators has an accuracy of 5% over the whole temperature range. A quartz oscillator circuit can guarantee an accuracy of about 0.01%. As Florent said, an RC oscillator is just like any oscillator but isn't accurate(microcontrollers have means to calibrate the RC oscilaltor) and its output frequency drifts.

  • \$\begingroup\$ Ok so to sum up the RC oscillators can be also useful in microcontrollers if the accuracy does not vary am I right? \$\endgroup\$ – FieryCod May 8 '16 at 12:44
  • \$\begingroup\$ true. other than clocking the microcontroller's CPU, the watchdog timer inside the microcontroller and the ADC timer are RC oscillators (they need seperate timers for different functions so the cheapest and smallest in size is an RC oscillator) \$\endgroup\$ – fhlb May 8 '16 at 12:52
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    \$\begingroup\$ The R-C oscillators used in microcontrollers are astable multivibrators, not sinewave oscillators. Since the question specifies the latter, this answer is not relevant. \$\endgroup\$ – Dave Tweed May 8 '16 at 13:25
  • \$\begingroup\$ @Dave you're absolutely right. \$\endgroup\$ – fhlb May 8 '16 at 13:27

You're right, they are used in electronic music instruments.

The twin-T oscillator for example is used in the very famous TR-808 drum machine.

RC oscillators can be used in any application where you don't need frequency precision and stability, as their frequency vary depending on the temperature for example. You could use them to clock a microcontroller but it's better not to considering their unstability.

  • \$\begingroup\$ Thanks but I'm still have to find at least 4-5 usages. \$\endgroup\$ – FieryCod May 8 '16 at 12:30
  • 1
    \$\begingroup\$ Is this for a homework? You can think of plenty of usages from what I told you. There is also much information on the internet. \$\endgroup\$ – Florent May 8 '16 at 12:31
  • \$\begingroup\$ No it is not for homework, it is for all stack users including me. I will be writing a test and I want to extend my knowlegde. \$\endgroup\$ – FieryCod May 8 '16 at 12:32
  • \$\begingroup\$ Most SMPS use RC osc. \$\endgroup\$ – Autistic May 8 '16 at 12:38
  • \$\begingroup\$ @Autistic could you proof your comment? \$\endgroup\$ – FieryCod May 8 '16 at 12:55

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