[sdiy] Looking for low parts count HF-VCO

[Magnus Danielson]

From: "Daniel Araya" <daniel.araya at sr.se>
Subject: [sdiy] Looking for low parts count HF-VCO
Date: Tue, 16 Jan 2007 15:05:18 +0100
Message-ID: <s5ace9c9.009 at rhcl03n02.sr.se>

> Hi, 

Daniel,

> I need a simple VCO with a range of about 500kHz to 1,5Mhz, I need it
> vary the samplerate of an ISD sampling/playback IC. 
> I vaguely remember somebody using a 4046 and have also read about using
> 555's for HF VCO. 

The 4046 would be a no-brainer. It should prove to be no major issue to have it
do that. It's really a cook-book thing. We are talking about a 4046, a cap and
a resistor or there abouts. Oh, and naturally a cap for decoupling.

> The stability of the VCO isn't that important, it's a pretty lo-fi
> sound in the ISD IC's anyway.
> 
> Any ideas?

The 4046 is the way to go if you ask me. You should be up and running in
no-time. Oh, and you can just forget about the detectors and just use the VCO
part. :)

Cheers,
Magnus