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.

MC
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