[sdiy] Tr-606 hats / cymbals

[Ullrich Peter]

Hi!


>The classic Roland (606, 808, etc.) metallic noise is 6 summed square
>waves.  You can do this with a hex inverting Schmitt trigger (40106 or
>similar).  The DR-110 hihat uses only 4 square waves, and the CR-78
>metal beat sound uses 3.  The similar Korg KR-55 and Wersi CX-1 use
>8 square waves which are X-OR "ring modulated" in pairs.  I tend to
>prefer this sound.  The 808 and KR-55 cowbell, and CR-8000 rimshot
>are also derived from these circuits.  The mixed square wave signals
>are put through bandpass filters, usually different ones for hihats
>and cymbals.

You can also see such a circuit in the Synchime design.
I placed a copy of the schematics  on my webpage as they can not be found at 
http://www.physicsenterprises.andrews.edu/diy_archive/schematics/drums/ any longer.

You can find the schematics via my webpage at http://come.to/synpro and select the 
top botton "downloads". I also placed my layouts  for this and the syntom  II circuit 
there as I built this drum synth 25 years ago.

This circuits lets you make strange cymbal sounds as you can filter the generated sound.

Ciao
Peter

http://come.to/synpro
http://go.to/datadial  (Synth addon)
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