Less famous fixed filters . Source : www.ruskeys.net/  

Tubes are HOT! Pulse Oscillator 

 from this page : http://users.triera.net/zupanbra/elektronke/Generator_pravokotnega_signala.html

Automatic Gain circuit from Joe Paradiso's modular

taken from 1978 issue of Polyphony magazine

Low Distortion audio oscillator ,more on the page : http://www.williamsonic.com/AudioOsc/index.html

 

 

 

- No drums were harmed during the making of this song .

Yoyo Oscillator ,the whole article about and the design is shared on this link : http://physics.mercer.edu/petepag/yoyo.html

 

 

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Our Moog, which ARP in waveform,

              Filter be thy Gain.

       Thy waveshape be square.

            Thy cutoff be 24dB,

            As it is in Oberheim.

Give us this VCA our board of bread.

   And solder together our circuits,

As we forgive those

Who think analogue is dead.

And lead us not into unwanted oscillation,

But decouple our supplies:

For sine is the pure tone,

And the power supply, and the modulation,

Forever and ever.

Ohm.

For a modern implementation of a CMOS organ concept or rather a CMOS poliphonic synth ,check out Jacob's project on his website : http://www.jacobwatters.com/c-monster.php#construction or the topic over at E-M : http://www.electro-music.com/forum/topic-45583.html