19/24
fig. 11, Ramp Bias adjustment display.
•
Saw
—
RMPBIAS
o Saw is just an inverted ramp, you’ve done enough already.
No, really, ignore any offset variance,
it’s fine
.
•
Triangle
—
TRIBIAS, TRSIADJ
o
TRIBIAS
is identical in function to
RMPBIAS
. Adjust to correct waveform offset.
o TRSIADJ controls the conversion of the ramp into a triangle, adjust this until
the display shows an equilateral triangle-ish shape (fig. 12).
No, I’m
not
getting bored with writing this manual
at all
.
fig. 12, Effect of adjusting the TRSIADJ trimmer potentiometer
•
Sine
—
TRSIADJ
,
SINAMP
,
SINRND
,
SINBIAS
o Ready for fun? The sine is derived by nonlinear distortion of the triangle and
has four trimpots that affect its shape. Sine is also the only one that has an
amplitude adjustment. Because I’m nice like that.
I mean, really, the damn thing has enough trimpots already, doesn’t it?
o
TRSIADJ
affects both triangle and sine. Adjust to correct any unevenness at
the bottom of the waveform, but it will also affect the triangle. Find a suitable
medium.
o
SINBIAS
is
not
the same as the other bias adjustments — the uppy-downy
thing — it is the bias on the distortion applied to the triangle relative to the
zero Volt baseline. Adjust this until the top and bottom of the sine are
balanced (fig. 13).
o Confession: the labels for
SINAMP
and
SINRND
are swapped. Ignore what
the words mean please. You have to adjust the two of them together anyway,
so it’s not that big of a deal. Following this:
SINRND
controls the amplitude (height) of the sine. Adjust this until the
sine is roughly ±5V
SINAMP
controls the roundness of the sine (fig. 14). Adjust this next until
the shape resembles a sine wave.
If, for some reason, you really borked
2
your sine wave or are just having
2. Really screwed up.
Summary of Contents for Infernal Noise Machine
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