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The summed control voltage (Manual, Pedal, LFO, Envelope follower) is fed into a sub audio BPF, then into a nonlinear amplifier with positive feedback (not a schmitt trigger, but similar), and then filtered by a second BPF. A variable portion of this is mixed to the straight CV to control the BBD's clock frequency. The effect is most prominent on single-shot, non-periodic CV changes, such as a fast single Manual of Pedal sweep. The single sweep is followed by smooth "echoes" that go in either direction (faster clock and slower clock). This is to emulate the "bouncing" tape speed of reel-to-reel tape machines when the friction from a thump against the reel is suddenly released.
When the BOUNCE control (a knob on the front) is full clockwise, only changes in the control signal (0 - 5 VDC, or what Steve refers to as CV in his post) affect the flanging while at full CCW only the control signal itself affects it. The control signals can come from the oscillator, the envelope follower, a manual adjust on the front panel, and a socket called remote (for a footpedal or other CV source). Unlike the Phaser, the FL-201 allows for combinations of the these four sources - for example the oscillator can be sweeping along at a given rate AND the envelope follower can add transients or longer releases. At one extreme of the knob, the user brings a signal differentiator, pulse shaper, and an active filter on-line. At the other extreme a VCO for setting the low frequency limit and a full-wave rectifier are in the path. The knob allows for mixing between these two extremes. They say, "(a)s this control is rotated clockwise, the flanging control signal is progressively substituted for by a damped sine wave initiated by changes in the control signal. This damped signal swings the flanging back and forth by a diminishing amount for each swing, simulating the "hunting" effect created by an AC or servo motor changing speed." How the electrons flow is described in great detail in the section called "Circuit Description" But without the schematic in front of you, the IC references won't make any sense I'll quote what's relevant. Let me know if you are bored. It seems IC11 is the differentiator and its output is dependent upon the rate of change of the input. They say, "(t)hus, when the oscillator changes from positive slope to negative slope," (crossing zero, right?), "the output of IC11 changes polarity." It says later, "The effect of all this circuitry is to generate a damped sinusoidal oscillation at a low frequency when the control voltage changes direction" (rising or falling, essentially anything but zero). Then it says, "(t)his corresponds in classical flanging to removing the load from the reel motor. The damped oscillation in flanging is caused by the mechanical inertia of the motor - when it reaches its proper speed, it cannot stop changing speed instantly, and thus tends to overshoot, causing it to slow down, etc.
И наконец:http://www.diystompboxes.com/smfforum/index.php?topic=49929.180Пост № 4564 - сэмплы.
