Difference between revisions of "Multiplex Echo Machine"

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Thermionic Studios has purchased this PCB and sourced the parts necessary to build this pedal. We are in the process of building the pedal and will have more to report upon completion.
 
Thermionic Studios has purchased this PCB and sourced the parts necessary to build this pedal. We are in the process of building the pedal and will have more to report upon completion.
  
−
* '''Thermionic Studios has one(1) Multiplex Echo Machine. When we finish assembling it, it will be available for rental'''
+
; Thermionic Studios has three(3) Multiplex Echo Machines:
 +
* One is "standard" with no modulation included,
 +
* Another is a "single modboard" version which includes a 1776 Effects Echo mod-board, with the warble switchable between the echoes, and
 +
* The final is a "double modboard" version which includes two 1776 Effects Echo mod-boards, one for each echo on the pedal.
  
 +
;When we finish assembling them, they will be available for rental.
  
 
==Controls==
 
==Controls==
Line 21: Line 25:
 
* Knob 3 - '''"Feedback":''' Increases / decreases the number of repeats - turning the knob clockwise increases the number of repeats.
 
* Knob 3 - '''"Feedback":''' Increases / decreases the number of repeats - turning the knob clockwise increases the number of repeats.
 
* Knob 4 - '''"Mix":''' Adjusts the dry/wet blend. Align the knob directly in the middle to have a 50/50 dry/wet mix.
 
* Knob 4 - '''"Mix":''' Adjusts the dry/wet blend. Align the knob directly in the middle to have a 50/50 dry/wet mix.
−
* 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:
+
* Knob 5 (3-position switch) - '''"Tape Mode":''' Changes the way the signal is routed through the PT2399’s (the integrated circuits that do the actual delay calculations) to simulate tape delays of the past:
 
*# Binson Echo rec
 
*# Binson Echo rec
 
*# Roland RE-201 Space Echo
 
*# Roland RE-201 Space Echo
Line 27: Line 31:
 
* Footswitch 1 - '''"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.
 
* Footswitch 1 - '''"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.
 
* Footswitch 2 -'''"On/Off":''' This turns the effect on and off in the signal chain
 
* Footswitch 2 -'''"On/Off":''' This turns the effect on and off in the signal chain
 +
 +
Please note that there are additional control instructions below, pertaining to the addition of a 1776 MP Modulation Board for the Multiplex Echo Machine.
  
 
==Bypass: True==
 
==Bypass: True==
Line 32: Line 38:
  
 
==General Information==
 
==General Information==
−
One thing to note about the Multiplex Echo Machine is that 1776 Effects also builds a modulation PCB that is meant to compliment it. With the purchase, population, and installation of this additional PCB, it is possible to create chorused, phased, or warbled sounds - sounds that emulate what would actually be created with those old original physical tape echo/delay systems. In many cases on those original units, the addition of some out-of-service modulation was preferred. Delays that end up getting chorused, whether by accident or on purpose, can sound very good to the human ear.
+
[[File:1776_MultiplexEcho2_front.png|right|frame|<div style="text-align:right">Image from [https://en.audiofanzine.com/guitar-delay-echo-phrase-sampler/1776-effects/multiplex/ Audiofanzine]</div>]]
 +
 
 +
=== PCB Modboards ===
 +
The "MP Modulation Add-On PCB" is a small upgrade PCB made available by '''''1776 Effects''''' and enables a builder to add a warble effect to a Multiplex Echo Machine PCB. With the addition of one of these PCBs, it is possible to create chorused, phased, or warbled sounds - sounds that emulate what would be created using those old original physical tape echo/delay systems. As it turns out, the aging, wearing, and eventual electronic drift of the components on the original units away from their specifications (or the actual stretching of the magnetic tape they employed), resulted in a "this-unit-needs-service"-type of modulation that in many cases ended up being preferred by musicians and listeners.
 +
 
 +
 
 +
It's possible to hook up an MP Modulation Add-On PCB to either the first, or the second delay. If you're only adding one Mod PCB, '''''1776 Effects''''' recommends installing the warble to the second delay. On the second image of the Multiplex Echo, notice the toggle that gives the user the ability to switch the warble between the first and second echoes.
 +
 
 +
=== Warble Controls ===
 +
There are two knobs for each warble and the pair act as standard modulation controls:
 +
* Speed Knob - '''"Speed":''' Sets the speed of the repeat of the warble modification of the echo effect.  The period of the warble is made faster as the knob is turned clockwise.
 +
* Depth Knob - '''"Depth":''' This control sets the eccentricity of the warble effect.  Turning the knob clockwise will make the warble more extreme; counter-clockwise, less extreme.
 +
 
 +
; Here's the instruction from the 1776 Effects MP Modulation Board Build Guide:
 +
 
 +
<blockquote>
 +
<div style="background-color:#222222; border:2px solid #e69710; padding:10px; {{border-radius|8px}}">
 +
"To connect the modulation board to the Multiplex, wire the O (out) pad to lug 3 of the delay 2 pot on your Multiplex build. If you want to be able to turn off the mod connect a SPST or SPDT switch between the O (out) and Delay pot. You could also use an On/Off/On switch, connecting the O (out) to the center lug of the switch and connect one outer lug to Delay1 and the other outer lug to Delay2. This will turn off the modulation in the center position, or send it to either delay 1 or delay 2. If only wiring one delay pot you should choose delay pot 2."
 +
</div>
 +
</blockquote>
  
 
http://1776effects.com/wp-content/uploads/2015/03/Multiplex-Build-Doc-1.7.pdf
 
http://1776effects.com/wp-content/uploads/2015/03/Multiplex-Build-Doc-1.7.pdf
Line 38: Line 63:
 
==Pedal Manual==
 
==Pedal Manual==
 
As of this time, 1776effects.com has not issued a separate manual on how to use the pedal.  The best current references that we're aware of are this wiki page, or the build manual linked here to the 1776 Effects website which describes the architecture of, and how to build the pedal.
 
As of this time, 1776effects.com has not issued a separate manual on how to use the pedal.  The best current references that we're aware of are this wiki page, or the build manual linked here to the 1776 Effects website which describes the architecture of, and how to build the pedal.
 +
 +
==Build Details==
 +
In the instance where this is a pedal built by Thermionic Studios, provide the specifics of the build in this section here. In the instance of a production pedal, either post an image of the completed PCB of the production in the enclosure, or remove this page section entirely.
 +
 +
[[File:JMKPCBs_TestingRig_PCB.png|center|frame|<div style="text-align:right">JMKPCBs Testing Rig PCB</div>]]
 +
 +
<center>
 +
{| class="wikitable" style="center; margin-right:20px; background-color:#eeffee;" cellpadding="10"
 +
|-
 +
! Item || Value
 +
|-
 +
| '''''PCB Creator''''' || (PCB Creator)
 +
|-
 +
| PCB Dimensions || length X width (metric)<br>length x width (SAE)
 +
|-
 +
| Enclosure Size || Hammond 1590(!!)/1550(!!)
 +
|-
 +
| Enclosure Orientation || Portrait / Landscape
 +
|-
 +
| Power Adapter || 9 volts, Standard Boss "barrel-negative" supply <br>9-volt battery snap available
 +
|-
 +
| Power Consumption || 'XXX' milliamps
 +
|}
 +
</center>
  
 
==Phase Inversion: No==
 
==Phase Inversion: No==
 
From our examination of the schematic below, the Multiplex Echo Machine appears to not invert phase on the output as compared with the signal that goes into the pedal.
 
From our examination of the schematic below, the Multiplex Echo Machine appears to not invert phase on the output as compared with the signal that goes into the pedal.
  
 +
===Multiplex Echo===
 
{| class="wikitable" style="left; margin-right:20px; background-color:#eeffee;" cellpadding="10"
 
{| class="wikitable" style="left; margin-right:20px; background-color:#eeffee;" cellpadding="10"
 
|-
 
|-
Line 55: Line 105:
 
* NOTE: Q1 modifies the period of the H11F1 IC. Q1 is engaged by means of the momentary switch (the '''Tape Speed''' control). So Q1 doesn't actually touch signal - just modifies the delay control. So while the transistor itself inverts phase, because it doesn't ever touch the signal, it can't cause a phase inversion of the signal coming out of the pedal.
 
* NOTE: Q1 modifies the period of the H11F1 IC. Q1 is engaged by means of the momentary switch (the '''Tape Speed''' control). So Q1 doesn't actually touch signal - just modifies the delay control. So while the transistor itself inverts phase, because it doesn't ever touch the signal, it can't cause a phase inversion of the signal coming out of the pedal.
  
−
As with all schematic observations, this will need to be born out by testing of the actual pedal.
+
===MP Modulation Board===
 +
{| class="wikitable" style="left; margin-right:20px; background-color:#eeffee;" cellpadding="10"
 +
|-
 +
! Schematic ID || Electronic Part || Action || Phase State
 +
|-
 +
| IC1a || TL072 || Non-inverting || Original
 +
|-
 +
| IC1b || TL072 || Non-inverting || Original
 +
|}
 +
 
 +
As with all schematic observations, the phase state output by the pedal will need to be born out by testing of the actual pedal.
  
 
==Schematic==
 
==Schematic==
 +
===Multiplex Echo===
 
[[File:1776Effects_MultiplexEchoSchematic.png|center|frame|<div style="text-align:right">&copy; Copyright 2016, JRM/1776Effects.com</div>]]
 
[[File:1776Effects_MultiplexEchoSchematic.png|center|frame|<div style="text-align:right">&copy; Copyright 2016, JRM/1776Effects.com</div>]]
 +
 +
===MP Modulation Board===
 +
[[File:1776Effects_MPModSchematic.png|center|frame|<div style="text-align:right">&copy; Copyright 2013, JRM/1776Effects.com</div>]]
  
 
==Artists==
 
==Artists==
Line 68: Line 132:
 
;Additional Sources
 
;Additional Sources
 
* https://youtu.be/yyB_XAd_D5g
 
* https://youtu.be/yyB_XAd_D5g
 +
* https://youtu.be/AuRNRvqXHD8
  
  

Latest revision as of 19:05, 7 January 2023

1776 Effects Multiplex Echo Machine. This is a delay pedal that appears to have been wholly designed and implemented by 1776 Effects. What makes this delay different from other delays available in the marketplace is that it enables emulation of three different magnetic tape-style echo/delays from days past:

  • The Binson Echorec
  • The Roland RE-201 Space Echo
  • The Echoplex Ep3

This is done by using two different ICs (integrated circuits) and controlling the timing and order in which each IC has signal fed into it.

Thermionic Studios has purchased this PCB and sourced the parts necessary to build this pedal. We are in the process of building the pedal and will have more to report upon completion.

Thermionic Studios has three(3) Multiplex Echo Machines
  • One is "standard" with no modulation included,
  • Another is a "single modboard" version which includes a 1776 Effects Echo mod-board, with the warble switchable between the echoes, and
  • The final is a "double modboard" version which includes two 1776 Effects Echo mod-boards, one for each echo on the pedal.
When we finish assembling them, they will be available for rental.

Controls

  • Knob 1 - "Delay 1": Sets the delay time of the first delay - turning the knob clockwise increases the length of the delay.
  • Knob 2 - "Delay 2": Sets the delay time of the second delay - turning the knob clockwise increases the length of the delay.
  • Knob 3 - "Feedback": Increases / decreases the number of repeats - turning the knob clockwise increases the number of repeats.
  • Knob 4 - "Mix": Adjusts the dry/wet blend. Align the knob directly in the middle to have a 50/50 dry/wet mix.
  • Knob 5 (3-position switch) - "Tape Mode": Changes the way the signal is routed through the PT2399’s (the integrated circuits that do the actual delay calculations) to simulate tape delays of the past:
    1. Binson Echo rec
    2. Roland RE-201 Space Echo
    3. Echoplex v. Ep3
  • Footswitch 1 - "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.
  • Footswitch 2 -"On/Off": This turns the effect on and off in the signal chain

Please note that there are additional control instructions below, pertaining to the addition of a 1776 MP Modulation Board for the Multiplex Echo Machine.

Bypass: True

The Multiplex Echo Machine is a true bypass pedal.

General Information

Image from Audiofanzine

PCB Modboards

The "MP Modulation Add-On PCB" is a small upgrade PCB made available by 1776 Effects and enables a builder to add a warble effect to a Multiplex Echo Machine PCB. With the addition of one of these PCBs, it is possible to create chorused, phased, or warbled sounds - sounds that emulate what would be created using those old original physical tape echo/delay systems. As it turns out, the aging, wearing, and eventual electronic drift of the components on the original units away from their specifications (or the actual stretching of the magnetic tape they employed), resulted in a "this-unit-needs-service"-type of modulation that in many cases ended up being preferred by musicians and listeners.


It's possible to hook up an MP Modulation Add-On PCB to either the first, or the second delay. If you're only adding one Mod PCB, 1776 Effects recommends installing the warble to the second delay. On the second image of the Multiplex Echo, notice the toggle that gives the user the ability to switch the warble between the first and second echoes.

Warble Controls

There are two knobs for each warble and the pair act as standard modulation controls:

  • Speed Knob - "Speed": Sets the speed of the repeat of the warble modification of the echo effect. The period of the warble is made faster as the knob is turned clockwise.
  • Depth Knob - "Depth": This control sets the eccentricity of the warble effect. Turning the knob clockwise will make the warble more extreme; counter-clockwise, less extreme.
Here's the instruction from the 1776 Effects MP Modulation Board Build Guide

"To connect the modulation board to the Multiplex, wire the O (out) pad to lug 3 of the delay 2 pot on your Multiplex build. If you want to be able to turn off the mod connect a SPST or SPDT switch between the O (out) and Delay pot. You could also use an On/Off/On switch, connecting the O (out) to the center lug of the switch and connect one outer lug to Delay1 and the other outer lug to Delay2. This will turn off the modulation in the center position, or send it to either delay 1 or delay 2. If only wiring one delay pot you should choose delay pot 2."

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

Pedal Manual

As of this time, 1776effects.com has not issued a separate manual on how to use the pedal. The best current references that we're aware of are this wiki page, or the build manual linked here to the 1776 Effects website which describes the architecture of, and how to build the pedal.

Build Details

In the instance where this is a pedal built by Thermionic Studios, provide the specifics of the build in this section here. In the instance of a production pedal, either post an image of the completed PCB of the production in the enclosure, or remove this page section entirely.

JMKPCBs Testing Rig PCB
Item Value
PCB Creator (PCB Creator)
PCB Dimensions length X width (metric)
length x width (SAE)
Enclosure Size Hammond 1590(!!)/1550(!!)
Enclosure Orientation Portrait / Landscape
Power Adapter 9 volts, Standard Boss "barrel-negative" supply
9-volt battery snap available
Power Consumption 'XXX' milliamps

Phase Inversion: No

From our examination of the schematic below, the Multiplex Echo Machine appears to not invert phase on the output as compared with the signal that goes into the pedal.

Multiplex Echo

Schematic ID Electronic Part Action Phase State
IC1a TL072 Inverts Inverted
IC1b TL072 Inverts Reverted - back to Original
Q1 2N3904 Inverts* Unaffected - please see note
  • NOTE: Q1 modifies the period of the H11F1 IC. Q1 is engaged by means of the momentary switch (the Tape Speed control). So Q1 doesn't actually touch signal - just modifies the delay control. So while the transistor itself inverts phase, because it doesn't ever touch the signal, it can't cause a phase inversion of the signal coming out of the pedal.

MP Modulation Board

Schematic ID Electronic Part Action Phase State
IC1a TL072 Non-inverting Original
IC1b TL072 Non-inverting Original

As with all schematic observations, the phase state output by the pedal will need to be born out by testing of the actual pedal.

Schematic

Multiplex Echo

© Copyright 2016, JRM/1776Effects.com

MP Modulation Board

© Copyright 2013, JRM/1776Effects.com

Artists

We are currently unaware of any artists actively using the pedal now, or who have in the past.

Additional Sources
Retrieved from "https://thermionic-studios.com/wiki/index.php?title=Multiplex_Echo_Machine&oldid=5611"