[sdiy] Roland TB-303 "square" wave variation

[Richie Burnett]

It was measured at the output of the waveshaper.

The various small coupling capacitors in the VCF and VCA circuits change the 
shape of the "square" waveform due to high-pass filtering action.  This is 
most noticeable for low pitched notes.

A Google image search for "TB-303 square wave" conveniently turned up this 
image that illustrates this behaviour:

https://static.gearslutz.com/board/imgext.php?u=http%3A%2F%2Fi.imgur.com%2FkIqEq7W.png&h=ab5a5cf9aec6aa0e6caefaecdf1b99a0

-Richie,


-----Original Message----- 
From: Mattias Rickardsson

He must have read it directly off the waveshaper. The filter would never 
pass the waveform this clean, as hinted by the previously published "weedy 
bass response" filter curves. :-)

/mr

Den 22 okt. 2015 7:31 em skrev "Bruno Afonso" <bafonso at gmail.com>:

Are you reading this off the VCO waveshaper or after going through the rest 
of the circuit ?

b