Modulated waveform idea

[Ken Stone]

Asuming I understand what you are saying correctly...
The problem with this idea is as frequency increases, signal level 
decreases if you are using fixed charge/discharge for generating your 
waveshapes (timed for the lowest frequency). An AGC then needs to be 
used to compensate. 

>as I was reading the posts regarding different waveforms I came up with
>this idea for a voltage controlled waveform generator:
>- make two sub-oscillators with flip-flops using the pulse-width modulated
>  VCO output:
>	- first FF is rising edge triggered
>        - second FF is falling edge triggered
>- these two signals are the used to gate an other waveform
>  (saw/triangle/sine...)  on or off and the resulting waveforms are summed
>  or subtracted and various varying waveforms results  
>- additional variation can be added by controlling the DC-level of the
>  signal off situation.
>
>All you should need is a dual CMOS FF, a 4066 and one or more opamps plus
>the passive thuff to add two or three more pots to tweak.
>
>Maybe somebody has tried this already...
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>   Kimmo Koli                         Helsinki University of Technology 
>   kimmo at ecdl.hut.fi                  Electronic Circuit Design Laboratory
>   http://www.ecdl.hut.fi/~kimmo      Otakaari 5 A 
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                Ken Stone  sasami at blaze.net.au
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