[sdiy] Buchla 144 dual square wave oscillator

[Dennis Verschoor]

I have a 144 here and it's a pretty nice sounding vco.

On Sat, Jul 4, 2009 at 8:16 PM, Donald Tillman<don at till.com> wrote:
>   > From: "Jerry Gray-Eskue" <jerryge at cableone.net>
>   > Date: Fri, 26 Jun 2009 13:53:58 -0500
>   >
>   > Complements, this is a nice detailed analysis.
>
> Thanks.
>
>   > So I take it that the flip-flop is a Toggle type providing a
>   > divide by 2 of the oscillator frequency?
>
> I was going to suggest Wikipedia..., but man, the Wikipedia Flip Flop
> page is confusing mess.
>
> The flip flop here has two transistors, and two stable mirror-image
> states that it can be in -- each state has one transistor on and one
> transistor off.  A single pulse input causes the flip flop to switch
> from one state to the other.  Hence the name "flip flop".  And so a
> flip flop will convert a string of pulses into a square wave.
>
> And since two state changes make a square wave, yes, it will divide
> the original frequency by two.
>
> Don Buchla could have just squared up the original sawtooth wave, but
> he probably went to the trouble of using this approach so he could be
> assured of of having a 50% duty cycle without any trimming.  Hence the
> "square wave" in the title of the module.
>
>  -- Don
>
> --
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



-- 
Music at: http://mono-poly.blogspot.com/