[sdiy] NEWBEES are alive and kickin' !

[>>>marjan<<<]

> We noticed VCO's can be arse-kickin simple. A battery, a resistor, a capacitor and a 'four-layer-diode' (sorry i do not know the proper english word, but it's such a diode that starts conducting at a certain (positive) voltage (NOT being almost 0)) can already make a SAW Oscilator.
> 

a SCR, thyristor...
Check out Korg Ms20, polysix or tb303 vcos for such types


> So, questions:
> 
> 1) Why are most VCO's (e.g. in tom's cookbook) having a quite complicated structure. Just to make it 1 V/Oct? (than that must be hard.)
> 

all types of stability, 1v/oct track thru all the range, same
performance thru the whole range, 
wave precision, expo control...

> 2) A bit the same question: Are there any circuits converting a CV linear with frequency to a CV linear to note (1V/oct)? Or do 1V/Oct need to generate the waveshapes in a completely different way in order to be so?
> 

that would be lin to exp conversion?
hmm, it could be done in several ways, for practical ones try finding
MS04 or (02 or 03) korgs utility modules, they are online somewhere
(or I can send them to you)
also I think
Magnus Danielson had such cct but can't find the link...



cheers,


marjan