Hi Everyone

I need control a VCO (IC 4046) so it need a LFO (low frequency oscillator), it must be sinusoidal, range about 0.1 to 1.0 Hz.
Could someone say where find it ? or, How design it ? ( better if use single +9V).

Regards

Audiofilo

 

Hello,

A nice place for music related oscillators is :
http://www.musicfromouterspace.com/analogsynth.php?page=ANALOG
Most circuits work with + 12 Volt and - 12 Volt.
An other more on education minded site is :
http://www.educypedia.be/electronics/analogoscil.htm
There are links to all kinds of oscillators including designs with opamps.

Greetings,
Bertus

 

The sinusdoidal part is the hard one. If I read the data sheet correctly the on board VCO will do the freq just fine. I've put some work into this, you can convert the square wave to a triangle wave, and then to a sine wave with an op amp intigrator.

Why phase locked and why do you need a sine wave?

 

Hi, Bertus, Bill, thank.

It is for a chorus circuit, it use a BBD (MN2008) which use a external clock, I need sweep the clock slowly. For chorus the sweep must be sinusoidal (i.e, for flanger effects it must be triangular).

Regards