Pittsburgh Modular Taiga - Page 35

12.1 Echos Overview:
The Echos module utilizes a pair of 4,096 stage BBD chips to produce a voltage controllable
analog delay signal. Clean delay time can vary from 16ms to 250ms. The maximum delay time
can be increased using the [Echos Time CV Input Jack]. The delay time maxes out at 500ms but
the increased time comes at the cost of delity and high frequency clock noise bleed.
The name BBD stands for bucket brigade device in reference to a line of people passing
buckets of water to quickly extinguish a re. Each stage of a BBD chip contains a single
capacitor. Pairing two chips together creates a chain of 8,192 capacitors. Like the water
buckets, an audio signal is passed from capacitor to capacitor within the BBD chips once
every clock step. A slower clock produces a longer delay and a faster clock produces a
shorter delay.
12.2 Echos Delay Time:
Delay time is set by adjusting the [Echos Time Knob]. Turning the knob to the right increases the
delay time. Delay time can be voltage controlled by patching into the [Echos Time CV Input
Jack] and adjusting the [Echos Time CV Knob]. The [Echos Time CV Knob] is an attenuverter.
That means the incoming signal is off(-ish) when the knob is set to the 12 o’clock position.
Turning the attenuverter to the right passes the original signal through. Turning the attenuverter
to the left passes an inverted version of the original signal through. Turning the [Echos Time CV
Knob] to the right will increase the amount of CV passed through to the delay time. Turning the
[Echos Time CV Knob] to the left will increase the amount of inverted CV passed through to the
delay time. Locating the exact off position of an attenuverter can be difcult. The easiest way
to remove the CV signal from the signal path is to simply remove the patch cable patched into
the [Echos Time CV Input Jack].
12.3 Echos Regeneration:
The [Echos Regeneration Knob] sets the amount of repeats created by the delay. Turning the
[Echos Regeneration Knob] full left will produce 1 repeat. Turning the knob to the right increases
the number of repeats until the delay begins to self-oscillate.
12 Echos Module
echos
time
out
time
in
mix
regen
echos
time cv
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