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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> controlling the frequency of oscialtor https://designers-guide.org/forum/YaBB.pl?num=1367563688 Message started by neuro11 on May 2nd, 2013, 11:48pm |
Title: controlling the frequency of oscialtor Post by neuro11 on May 2nd, 2013, 11:48pm Hi, is there a oscilator type, the frequency of which can be controlled using one component(capacitor). I mean unlike wien bridge oscilator where RC network determines the condition of oscilation and frequency of oscilaion, i want a oscilator of which frequency can be controlled by a capacitor indepoendent of conditions for oscilations. Please help!!! Thnx |
Title: Re: controlling the frequency of oscialtor Post by raja.cedt on May 3rd, 2013, 12:18am read about VCO.... |
Title: Re: controlling the frequency of oscialtor Post by neuro11 on May 3rd, 2013, 4:07am raja.cedt wrote on May 3rd, 2013, 12:18am:
Hi, thanks for your reply. I will check VCO. Could you please look at the schematic i attached. I have designed it based on a paper where the author explained the ic model, compnent value every thing and claimed the oscilation can be controlled through C2 only (from 10p to 1n) and oscilation condition depend on C1/C4= R2/R4. But somehow i cant make it work. Please have a look if i am missing something. Thanks |
Title: Re: controlling the frequency of oscialtor Post by raja.cedt on May 3rd, 2013, 5:12am hello, what kind of oscillator this? but there is some problem at opamp input pin number 3, there is no bias so it will not work. |
Title: Re: controlling the frequency of oscialtor Post by neuro11 on May 3rd, 2013, 7:55am raja.cedt wrote on May 3rd, 2013, 5:12am:
Sorry i have corrected it. |
Title: Re: controlling the frequency of oscialtor Post by raja.cedt on May 3rd, 2013, 8:31am Hello, Please have a look on wien bridge osc in google, you should have an -ve feedback around the op amp through some potential divider.... Thanks, Raj. |
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