[sdiy] Odyssey square wave not square?

[Grant Richter]

You don't mention what frequency you are talking about.
The amount of tilt should vary with frequency.
My guess:
The high pass filter section is not going to it's lowest setting.
What you are describing is simply the effects of high pass filtering  
(the one after the low pass before the VCA).
The cap or slide pot may be bad.

On Nov 26, 2005, at 8:56 AM, Chris Kay wrote:

> Hi,  I have an Ody MKII (2813) which I 've been trying to  
> calibrate. If I set it up as follows:
>
> osc. 1 keyboard tracking on
> osc. 2 sync off
> PW slider fully down
> filter freq. slider fully up
> VCA gain slider fully up
> osc. 1 (or 2) to audio fully up
> all other sliders down
>
> I've noticed that when I monitor the high gain output with a scope  
> and send a square wave from one of the osc's, I don't get a square  
> wave out. I get something that resembles a shark's tooth pattern  
> and doesn't sound square, it's sort of buzzy, not hollow. I've  
> calibrated both square wave ouputs from board B(II) using the osc.  
> PW trimmers to get nice looking 50% pulse waves.
>
> Further more, when I select the sawtooth on either osc. and monitor  
> the high gain, I don't really get the classic ramp, rather an  
> initial spike followed by an exponential downward curve with some  
> small 'wobbles' on the tail. Again the sawtooth output from board B  
> looks like a nice classic sawtooth.
>
> Clearly something's happening to the signal in board C(II). Does  
> anybody have any ideas? All suggestions gratefully accepted.
>
> Cheers
> Chris