Ci 139......which circuit is "entirely pefect"? More than that, in electronics, no formula is "entirely" correct...we always have to face simplifications and neglections. And, of course, there is no linear oscillator which produces "clear" sinusoidal waves.it was a sarcastic reply to analog kid - (i don't like to repeat myself) i won't cange my statement about most sine wave oscillators being not entirely perfect ← this is what i have encountered so far and no matter what you say it does not change that experience.
You're going to have to go back and learn the fundamentals. How can you do a complicated design if you don't know squat!!?I used the GIC-resonator, but I got stuck again on how to use the JFET as VCR, when I change the input voltage the resistance of the JFET doesn't really change, and I cannot find the maximum input voltage(Vp). If someone could help.
PS: I am a first-year student, which got a project task to make this, but I have hardly any knowledge about these things.
You said and I quote:
Of course, we will help you in case of a special problem - however, here we cannot teach you how to use a FET as a variable resistance. You cannot find the information you need in the internet?? I must say - I cannot believe you.
The attached article might help; it discusses the design of a Wien Bridge oscillator with sine wave output, tuned by a pair of JFET voltage-controlled resistors. Obviously, not a project for beginners...
This is how my system looks likeHow about showing us a schematic of your attempt to control the resistance by varying the gate voltage. Is it possible that you are applying a voltage to the Gate that is greater than the voltage on the Source. That would explain why you can't get the resistance to change. Oh, by the way you know that the change will be non-linear if you manage to do it correctly.
I noticed the Manhattan style dead bug construction of the VCO and can assure you this is way beyond the capabilities of a 1st year. The use of a 741 in the TS schematic is a dead giveaway that something is wrong because 9kHz is the top end of the frequency range for that part as @Audioguru has often observed.The attached article might help; it discusses the design of a Wien Bridge oscillator with sine wave output, tuned by a pair of JFET voltage-controlled resistors. Obviously, not a project for beginners...
|Thread starter||Similar threads||Forum||Replies||Date|
|T||the outcome should be like this? voltage controlled oscillator||PCB Layout , EDA & Simulations||27|
|C||Voltage Controlled Sine Wave Oscillator||Homework Help||24|
|S||Generating two frequencies using a voltage controlled oscillator||General Electronics Chat||3|
|Voltage Controlled Oscillator with LM358||Analog & Mixed-Signal Design||33|
|Creating a Voltage Controlled Oscillator without using IC||Homework Help||5|
by Kate Smith