Wien Bridge VS Psipce = Mad Student - Electronic Circuits Projects Diagrams Free

drahte1905 · 7th January 2008, 06:31 PM

For a favor I need to design a Wien bridge oscillator with an oscillation frequency in the range of 1.9 kHz and 2.1
kHz. Use ±15 V supplies for the opamp.

Then I find following circuit which is suppose to have f=20kHz [I try to build a proper Wien and then shift f to 2kHz with replacing RC components magnitudes.] and build it with Pspice but I can't get an output

I read that i need to connect a function generator to give ossilation a head start but I can't figure out how I am gone connect FC tor circuit ?

Also to achieve 2kHz maybe I need help but having a output has got first priority

Roff · 7th January 2008, 08:04 PM

On the noninverting input (pin 3), set an initial condition (.ic) of 1V. get rid of the AC voltage source, and replace it with ground. It works in LTSpice when I do that.

drahte1905 · 7th January 2008, 08:49 PM

Quote:

Originally Posted by Roff

On the noninverting input (pin 3), set an initial condition (.ic) of 1V. get rid of the AC voltage source, and replace it with ground. It works in LTSpice when I do that.

Thanks for your quick responce;

Allright I get rid of AC sources but I cant understand initial condition part

I am using Pspice because it is obligatory in this project so; How we gone set an initial condition in Pspice

Roff · 8th January 2008, 02:14 AM

It's been about 11 years since I used Pspice. How do you run a transient sim? Most Spices use .tran <step size> <end time>. If this is how you do it, you can also do the following:
Place a node name on the noninverting input node. Let's say you call it "A". Use the directive
.ic v(A)=1
then run the simulation. If that makes no sense to you look in the documentation for "initial conditions" or ".ic" (which you should have done already). Failing that, maybe one of the other trolls here can help.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Bode Plot Wien Bridge Oscillator	andy257	General Electronics Chat	5	21st December 2005 10:29 PM
does anyone have an idea about the design of an wien bridge?	tyal26	Electronic Projects Design/Ideas/Reviews	2	8th May 2004 02:47 AM

7th January 2008, 06:31 PM	(permalink)
drahte1905	Wien Bridge VS Psipce = Mad Student For a favor I need to design a Wien bridge oscillator with an oscillation frequency in the range of 1.9 kHz and 2.1 kHz. Use ±15 V supplies for the opamp. Then I find following circuit which is suppose to have f=20kHz [I try to build a proper Wien and then shift f to 2kHz with replacing RC components magnitudes.] and build it with Pspice but I can't get an output I read that i need to connect a function generator to give ossilation a head start but I can't figure out how I am gone connect FC tor circuit ? Also to achieve 2kHz maybe I need help but having a output has got first priority Last edited by drahte1905; 7th January 2008 at 06:53 PM.

7th January 2008, 08:04 PM	(permalink)
Roff	On the noninverting input (pin 3), set an initial condition (.ic) of 1V. get rid of the AC voltage source, and replace it with ground. It works in LTSpice when I do that. __________________ Ron (aka Rube)

8th January 2008, 02:14 AM	(permalink)
Roff	It's been about 11 years since I used Pspice. How do you run a transient sim? Most Spices use .tran <step size> <end time>. If this is how you do it, you can also do the following: Place a node name on the noninverting input node. Let's say you call it "A". Use the directive .ic v(A)=1 then run the simulation. If that makes no sense to you look in the documentation for "initial conditions" or ".ic" (which you should have done already). Failing that, maybe one of the other trolls here can help. __________________ Ron (aka Rube)