Has anybody found a vco like LM566 model?

HI,
Has anybody found a vco like LM566 model? I need simulate the running of vco for my students.
thank you so much.
MCP

I'm always interested in helping students (and their instructors). On that note, I just passed along a phase-locked loop circuit to the forum, through a thread I began many months ago.
This url,
http://forums.ni.com/ni/board/message?board.id=370&message.id=50&query.id=581439#M50
should get you to the thread.
It isn't what I'd call a "designed" PLL, as I tweaked it into operation (the 1k was increased to 10k). But I think it's still pretty cool to play with, and I thought your students and the others here might like it. However, do note that I used a building block VCO. ...at least for the moment that is. ;-)

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