volt control of osc triange tilt?

Caloroso, Michael E CalorosoME at corning.com
Tue Nov 9 15:45:31 CET 1999

> In a message dated 11/8/99 5:55:20 PM, you wrote:
> <<...well as it happens I've got a block schematic for the CEM3396.
> I see a pulse width control input, and a waveshape control input,
> but nothing to say the tilt of the triangle is variable..>>
> I'm pretty sure that the waveshape CV lets you vary the wave continuously 
> from triangle to saw to pulse shape.  The pulse CV input effects the wave 
> only when the wavshape is set all the way over to pulse (it allows PWM).
> However, I don't think the 3396's variable triangle allows you to tilt the 
> triangle in either direction (left or right, making an up or down-going 
> sawtooth).  I think it only goes one way - until the wave becomes an up-going 
> sawtooth in shape, which then starts squaring off into a pulse.  I could be 
> wrong about this, though.  I'm pretty sure the 3396 spec sheet gives 
> pictorial examples of the available waveshapes.
The CEM3396 has two oscillators - Pulse and Wave.

The waveshape control input changes the Wave between a triangle and ramp, but according to the spec sheet it does indeed tilt in only one direction.  It has no effect on the Pulse.

"Do not take the OBMx swimming or play it in the rain" - warning label on rear of OBMx

Opinions (and mistakes) expressed herein are my own and not those of my employer.

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