Oscillotor circuit simulation in Proteus (ISIS)

I tried the circuit as attached, but it won't generate any output signal with ISIS.

Did I miss anything?

Boncuk

Hi Hans,

EDIT:
Have you tried with a 9V supply, CD devices are not super fast at 5V.

Also I would use a 3.3meg in place of the 10meg.

I dont use ISIS so I cannot double check.

This is from the d/s, it shows a difference in the connections.

Crystal oscillators have a long startup time. Run you sim out 20 to 50 msecs before you declare it dead.

RCinFLA said:

Crystal oscillators have a long startup time. Run you sim out 20 to 50 msecs before you declare it dead.

Click to expand...

So it must be definitely dead. I ran it for minutes without any change.

Where did you get the cd4521 model? Did you make it yourself?

Cheers Ian

Frequently an oscillator must be "kicked" to get it started in a SIM program.

Boncuk said:

So it must be definitely dead. I ran it for minutes without any change.

Click to expand...

That is oscillator run time, not computer run time, just to be sure. Unless you have a very fast computer, minutes of results would be likely hours of computer cpu time.

I would suspect the 2.2k resistor being too high in value and 82 pF being too large. There is quite a wack to loop gain with these values.

* I just noticed that pin 4 and 6 are reversed. The 2.2k should be fed from output of inverter.

https://www.electro-tech-online.com/custompdfs/2011/04/AN-118.pdf (see last page, fig. 8)