Search for ICL8038 : "ICL8038 Signal Generator Medium/Low Frequency 10Hz-450KHz Triangular/Rectangular/Sine Wave Generator" .

 

Yes, it is my brilliant writing to say "MOD IN" to allow external modulation to produce FM..
I have never used the modulation feature.

 

Go find AudioXpress Magazine....February 2007.
This oscillator is capable of 0.05Hz - 30kHz in one exponential (1 octave /volt)
sweep and sine and cosine outputs (90 degrees quadrature) with THD low enough (0.1%)
for frequency response measurements and audible distortion evaluation.
For those of you that are familiar with early music synthesizers,this circuit was designed by Dennis Colin...co-developer of the ARP 2600 synth.

 

Hello,

An other project is on Music from outer space:
http://musicfromouterspace.com/analogsynth_new/VCO20120618REV0/VCO20120618REV0.html

Bertus

 

Try an Intersil IC8038 or an XR-2206, both will handle that range. I'll attach a copy of the XR-2206 datasheet as the one on line has several mistakes in the internal cct. diagram, which I corrected and added some external components to, to make it more understandable.