EARTHQUAKER DEVICES: Disaster Transport Jr

This is my first layout for a PT2399 based delay.  The Earthquaker Devices Disaster Transport Jr.   It's a pretty cool delay, with some very usable sounds - the addition of the tone control certainly helps, especially if you like something a little lo-fi sounding, or just as a method to filter out noise on longer delay times.

This is a large layout compared to some others available - I've built a couple from other layouts, and they're always a bit cramped for my liking.   

EARTHQUAKER DEVICES DISASTER TRANSPORT JR - VERO LAYOUT

THE PT2399 CHIP

Want to know more - there's a really great analysis of the PT2399 chip on Electrosmash.  It's basically designed for karaoke machines.

TAILS MOD

I'll eventually get around to another version for keeping the delay tails when the pedal is bypassed.   The tails version basically runs as follows;

• Input & output jacks wired directly to the board (as marked in & out) - the TL072 is acting as a buffer that is always in the circuit (goodby tru-bypass if that bothers you).

• The foot switch is wired to break the signal going from the buffer to the PT2399 chip - so it stops signal reaching the delay chip, leaving the tails to finish naturally OR continue to self-oscillate if you have the feedback cranked.

MODULATION MOD - DISASTER TRANSPORT

Another mod is to add an LFO on a daughter board, so along with the tone control to filter the top end off the repeats, you can add something resembling tape warble. 

Modulation is the difference between the Disaster Transport Jr, and the regular Disaster Transport. 

The Keely Magnetic Echo is a very similar circuit to this one (like most PT2399 delays), with modulation.  So a good place to start for finding a LFO to add to the Jr.

VIDEO DEMO