AW: Mixturtrautonium (more details)

[Haible Juergen]

	>One ramaining problem:
	>I don't have any idea of who to build a subharmonic 
	>oscilator with 1/2,1/3,1/4 ... and/or 1/24th freq of the 
	>master oscillator, generating sawtooth waves, all with the 
	>same amplitude. 
	>My only idea is using a microprocessor, but
	>Oskar Sala build his instrument in the 30th, with tubes
	>(Surely without microprocessor).
	>Any ideas ????????????????????????????????????????????

My voltage controlled frequency divider (see schemos on my homepage)
produces the desired subharmonics. It sounds quite "Trautonium-like"
indeed, though I have only tried square waves. Square waves are what
you get at the output of my circuit. But internally, the variable frequency
division is made by a staircase generator, i.e. there is a kind of saw wave
already. Not smooth, of course, and level decreases with frequency, but
you could change this with a simple tracking VCF and VCA. You might
also look at the EDP Wasp schematics - they are producing decent 
saw waves from square waves with a very simple F/V converter and 
integrator.
Definitely no uP required.

JH