mettula Posted May 17, 2007 Report Share Posted May 17, 2007 Hello all, I need some help with this questionWhich of the following statements is not true and why?a. An oscillator must have a source of energy.b. An oscillator must have a frequency determining circuit.c. An oscillator must have an amplifier.d. An oscillator must have a negative feedback circuit.Is it b the one which is not right?thanks a lot Quote Link to comment Share on other sites More sharing options...
walid Posted May 17, 2007 Report Share Posted May 17, 2007 HiThe statements which is not true is:d. An oscillator must have a negative feedback circuit.because An oscillator must have a positive feedback circuit to maintain oscillation. negative feedback is good for amplifiers to get more stability. Quote Link to comment Share on other sites More sharing options...
mettula Posted May 17, 2007 Author Report Share Posted May 17, 2007 and yet another question which i cannot make my mind about.what circuit produces a sine, square, triangular, and saw tooth waveformsopamps or oscillators? i mean oscillators can be build from opamps. what is the best answer to thatthanks Quote Link to comment Share on other sites More sharing options...
walid Posted May 17, 2007 Report Share Posted May 17, 2007 I am not expert like Mr. guru, I will try to answer using my simple information : Oscillators can be built using opamps or transistors or may be some special IC's.opamps can not handle high frequency but transistors canif u want to build a function generator try to search one in google or tell me to find one for uThat is all I know regarding your question, and I hope that others help me in the answer Do not hesitate to ask about everything that comes to you Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 17, 2007 Report Share Posted May 17, 2007 Hi Walid,I mentioned the obsolete ICL8038 and XR2206 function generator ICs in my reply to his PM. Quote Link to comment Share on other sites More sharing options...
walid Posted May 17, 2007 Report Share Posted May 17, 2007 Thank you guru Quote Link to comment Share on other sites More sharing options...
mettula Posted May 20, 2007 Author Report Share Posted May 20, 2007 Thanks guys. Quote Link to comment Share on other sites More sharing options...
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