Problem with Oscillator dont run

[mpamponet]

May someone help me?This simple oscillator doesn´t oscillate. At real breadboard its ok. See attached. Thanks.

[Euler's_Identity]

I tried your circuit and it didn't oscillate.  So, as you're dealing with a charge and discharge of a capacitor in your circuit, I changed your simulation settings to "set to zero."  It still didn't oscillate with the large electrolytic.  So I changed the value to 0.1uF and tried it.  After closing the switch and charging the cap to about 0.9 volts, I then opened the switch and it began to oscillate.

Leaving it to run while I responded to you, I see that I have returned to a, roughly, 40mvp-p triangle at about 2ms repetition rate. 

So, give the above a shot and see what happens.

[mpamponet]

Dear Euler,

The expected is the circuit oscillate when the power is on. In this case it doesn´t oscillate. Thank you but yet stay the problem.

Would you or anybody may help me?

Best regards,

Mpamponet

[Euler's_Identity]

Why should the circuit oscillate?  What about its design causes it to oscillate?   If the circuit is supposed to oscillate upon power-up, why include a switch?

[mpamponet]

In fact I´d like to understand how this circuit oscillate because in practice it oscillates. The swtich doesn´t matter. It was a try to start the oscillation.

mpamponet

[Abel_Souza]

Hi,

Here have two links to help to help you.

http://zone.ni.com/devzone/cda/tut/p/id/5662

http://www.angelfire.com/electronic/beausalector/transistorastblcircuit.html

Regards,

Abel
NI Brazil