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 Forum index » DIY Hardware and Software » Developers' Corner
A New Opamp Sine Wave Oscillator...
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Thu Apr 10, 2008 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
will the component values in the example work ok? i am not too good at figuring out values on my own with formulas (not good at math)

thanks


Yes, the example is one that I built and tested so unless there's some mistake, I'm sure that those component values will work. If I recall correctly that oscillator ran at something like 170 Hz or so, which is barely in the low end of the audio range, so you should be able to hear it.

Note that you cannot just hook a speaker up to the output since the output is a low-current drive and speakers are 8 Ohms, of course. How do you plan to observe the signal, do you have an oscilloscope? If not, you could make a quick and easy LM386 amplifier to a speaker, or - I never tried this - I guess you could hook up a pair of headphone earbuds since they are high impedance.

Good luck, I hope you build it!

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loss1234



Joined: Jul 24, 2007
Posts: 1535
Location: nyc
Audio files: 41

PostPosted: Thu Apr 10, 2008 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, i will hook it up to an opamp preamp. and then patch it into my vca i suppose. although i think i am more interested in using it in the sub-audible range as an lfo.
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Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Thu Apr 10, 2008 7:46 am    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
i think i am more interested in using it in the sub-audible range as an lfo.


I looked at the component calculations. If you want to drop the oscillator into the sub-audible range, then you can multiply the resistors by 10 so that R1 = 50 k Ohm and R2 = 100 k Ohm. This will drop the frequency to 17 Hz. To take it one step further, you can multiply the capacitors by 10 so that C1 = 2 u F and C2 = 1 u F. This will drop the frequency by another factor of 10 to 1.7 Hz.

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