The second shot shows the same sine wave but sync'ed to the positive edge of an external square wave:
electronic design for sound synthesis
Friday, 3 February 2012
LFO Auxiliary Sine and Sync
Just for the record, here are scope shots of the Aux LFO sine output. The first shot shows the basic diode-shaped sine wave:
Clearly not a perfect sine, but the distortion is down to around 1% THD. Not hi-fi grade but certainly useful for modulation purposes.
The second shot shows the same sine wave but sync'ed to the positive edge of an external square wave:
The sync circuit is designed to reset the auxiliary oscillator to the 0 degree starting point. With the switch in the NEG position the oscillator is reset by the falling edge of the square wave.
The second shot shows the same sine wave but sync'ed to the positive edge of an external square wave:
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