Multiplex Echo Machine

000000==Controls==

• Knob 1 - "Delay 1": Sets the delay time of the first delay
• Knob 2 - "Delay 2": Sets the delay time of the second delay
• Knob 3 - "Feedback": Increases / decreases the number of repeats
• Knob 4 - "Mix": Adjusts the dry/wet blend
• Knob 5 (3-position switch) - "Tape Mode": Changes the way the signal is routed through the PT2399’s to simulate tape delays of the past:
  1. Binson Echo rec
  2. Roland RE-201 Space Echo
  3. Echoplex v. Ep3
• Footswitch 1 -"On/Off": This turns the effect on and off in the signal chain
• Footswitch 2 - "Tape Speed": Holding down the momentary footswitch slowly speeds up the delay speed. Releasing the switch slows the speed back down to the time setting of the knob. The tape speed is highly interactive depending on how you have "Delay 2" set.

General Information

http://1776effects.com/wp-content/uploads/2015/03/Multiplex-Build-Doc-1.7.pdf

Phase Inversion

Electronic Part	Action	Phase State
Q1	Inverts	Inverted
Q2	Inverts	Reverted
Q3	Does not Invert	Reverted
Q4	Inverts	Inverted
IC1a	Does not Invert	Inverted
IC1b	Does not Invert	Inverted

Schematic

© Copyright 2016, JRM/1776Effects.com

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Additional Sources

Build Instructions