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PWM Section
The rightmost output on TZ0 is a PWM
or pulse-width-modulated output. A pulse
signal with PMW is a square-shaped
signal that can vary its duty-cycle (the
amount of time the wave is high vs low).
The PWM signal is derived by simply
feeding the triangle from the VCO core
to a comparator, with the other voltage
of the comparator being some voltage.
The TZ0 PWM section is shown in the
diagram above. The overall initial pulse-
width is simply set by using the "PW"
knob. When the knob is centered, the
pulse output will be 50% duty cycle (a
square). Turning the knob CCW makes
for narrower pulses, and CW makes for
wider ones.
Finally, any signal such as a LFO or
VCO or envelope can be inserted into
the "PWM" jack and used to modulate
the width of the pulse output. It is simply
summed with the DC value which is
adjusted by the "PW" knob.
© 2023 Weston Precision Audio
Sync
The oscillator core of TZ0 can be sync'd
from another oscillator with the "Sync"
input. It is a "reset" or "hard" sync type
which resets the triangle's integrating
capacitor on the rising edge of the
inputted sync signal. Try keeping the
sync signal fixed and adjusting the
tuning put constant for classic sync
sounds.
The diagram below shows the action of
the "Sync" input:
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