[sdiy] High frequency VCO designs

[Tim Ressel]

Um, why 20-40MHz? The 50240 TOG uses 1/10 that. At 2 MHz the venerable 4046 will do the trick.

Tim Ressel
Circuit Abbey
503-750-9331
timr at circuitabbey.com



----- Original Message -----
From: Tom Wiltshire <tom at electricdruid.net>
To: synthdiy diy <synth-diy at dropmix.xs4all.nl>
Cc: 
Sent: Monday, September 22, 2014 2:01 PM
Subject: [sdiy] High frequency VCO designs

Hi All,

What contemporary VCO designs are there that can cope with frequencies between 20-40MHz?

There were several synth designs based on top-octave-dividers that used a high frequency VCO to clock the divider (PolyMoog, for one example). It occurred to me (and I'm not the first) that whilst you can't copy aTOG chip in a PIC, you can adequately copy a single output of a clock chip and it's associated divider. This is closer to the older 12-separate-oscillators-plus-dividers scheme. But that's fine, better even. The important thing is to get some voltage control in there by using a VCO for the uP clock.

So, VC-clocks for a PIC? Any ideas?

Thanks,
Tom

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