high freq vco

[Magnus Danielson]

From: Scott Gravenhorst <chordman at earthlink.net>
Subject: Re: high freq vco
Date: Sun, 13 Aug 2000 08:36:52

> This may be old news:
> 
> Someone mentioned the LM566 VCO...  I was interested in what
> the output circuit looked like so I looked it up on the web.
> National has it classified as "discontinued".  My concern
> was that it was built like the 555 timer which crowbars
> the supply whenever the logic output switches states.  I
> have already been thru this with the FatMan VCOs and would
> like to avoid this.

Well, what you should look after is the NE566, which we recall that Signetics
had, but that is now part of Philips Semiconductor so you will find it at:

http://www.semiconductors.com/pip/NE_SE566

I note the feature:

* Frequency adjustable over 10-to-1 range with same capacitor 

Anyway, there is an PDF so you can fetch that and have a look. The internal
topology is featured. No SPICE model as far as I can see.

Cheers,
Magnus