1776 Multiplex Delay Modulation Add-on

 A little useful modulation daughterboard for your delay circuits. Created by the one and only Chris Stelloh.

I originally made this for Ben Spinks, who verified it. It's the modulation daughterboard for the 1776 Effects Multiplex delay and it works pretty well with just about any PT2399 delay circuit. I've listed my preferred values as well as the originals from the build document. You can add a toggle between the mod depth and the delay pot to turn it off and on, but if you simply max the speed/rate knob, the modulation is no longer audible and the rate LED is static.

 

1776 Effects RE-20 stripped down

 Here is another great layout by Sebastian!

In his own words...

Just wanted to share a layout I did of the RE-20 circuit from the 1776 Multiplex Echo Machine. It seemed like there aren't a lot of options for delay effects with parallel, independent delay controls. For the sake of simplicity (and a layout that would fit in anything smaller than a shoebox), I haven't included either the speed-ramp circuit from the original Multiplex, or the modulation circuit from the Multiplex Jr.

 

1776 Effects Multiplex Jr.

 Schematic and info HERE .

Original calls for a VTL5C3 vactrol but since they are obsolete and stupidly expensive the layout calls for a home made vactrol. Just socket the LED and LDR to find the right combo.