Enclosure not stated · 4 knobs
Earthquaker Disaster Transport JrVerified
Based on the EarthQuaker Devices Disaster Transport Jr· 5 other boards clone it
From the post
Had a sleepless night, so I decided to knockout some new layouts before the end of the new year. This one kicked my ass a bit, but I got it as small as I could. a nice sounding delay, that's similar in architecture to the Deep Blue Delay. It's a nice sounding warm, natural delay.
From the source:
The Disaster Transport JR is an analog voiced digital delay with 625ms delay time with an all analog dry signal path and true bypass switching. It was designed as an anti-modern delay for those who appreciate a nice vintage tape echo with all it’s peculiarities. Its unique tone control doubles as a noise filter on longer delay settings and really helps the delay shine with a dirty signal. The mix control allows you to boost the effected signal to nearly 4x the original signal level and the repeats control goes from one signal repeat to near infinite repeats all the way through to self oscillation.
Controls
Mix: Sets the output level of the effected signal. This should be treated as a gain control/master volume for the delay line. Unity is around noon and everything above noon will boost the delayed signal louder than the original. This is a gain control so, like any pedal with a lot of gain, a hint of noise and distortion at max setting is completely normal.
Tone: Most delay pedals are heavily filtered at the output to remove the clock noise and other unwanted hash that is common from extending the range of the delay time beyond the limit of the circuitry. This usually leaves the delay sounding dark, muddy and disappear when hitting it with dirt. The Disaster Transport has done away with a lot of the heavy filtering and replaced it with a tone control which allows the user to choose their desired sound and results in more natural tape-like repeats. The tone control is at it’s darkest fully counter clockwise and brightens as you turn it clockwise. A good rule of thumb is to leave the tone control between off (fully counter clockwise) and noon at longer delay times. This will remove all the common noise from hyper-extending the circuit.
Time: From about 30ms fully counter clockwise to about 625ms fully clockwise.
Repeats: Sets the regeneration of the delay line. From one single repeat fully counter clockwise, subtle repeats around 9 O’clock, strong naturally decaying repeats at noon, near infinite repeats around 2 O’clock and full on self oscillation fully clock- wise.
Original:
Tails:
A version of this pedal was requested with tails, so I took a look at the Deep Blue Delay, which this is based off of, and made the same modifications. To have tails, you don't use a 3PDT switch and the usual stomp switch wiring, you're going to use a DPDT switch with the input and output wires going directly to the sockets. With tails the stomp here will cut new signal going into the PT2399 and so when bypassed the output of the PT2399 will continue repeating with the last input it received and the repeats continue, and IC1 will the
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 28 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 20k at column 21, rows M-N (right edge, beside the Tone 2 / Mix 3 wires): top of the resistor is covered by a 1uF electrolytic, label reads 20k but could be 220k
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 1k | 1k | read from the layout by eye | |
| ×8 | 10k | 10k | read from the layout by eye | |
| ×1 | 20k | 20k | read from the layout by eye | |
| ×3 | 22k | 22k | read from the layout by eye | |
| ×3 | 47k | 47k | read from the layout by eye | |
| ×1 | 100k | 100k | read from the layout by eye | |
| ×2 | 220k | 220k | read from the layout by eye | |
| ×2 | 470k | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 9 | ||||
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×6 | 22nF | 22n | read from the layout by eye | |
| ×6 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×5 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | read from the layout by eye | |
| ICs 3 | ||||
| IC1 | TL072 | TL072 | read from the layout by eye | |
| IC2 | PT2399 | PT2399 | read from the layout by eye | |
| Regulator | 78L05 | 78L05 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Time | B50K | B50k | Potentiometer | read from the layout by eye |
| Repeats | B5K | B5k | Potentiometer | read from the layout by eye |
| Mix | B5K | B5k | Potentiometer | read from the layout by eye |
| Tone | B25K | B25k | Potentiometer | read from the layout by eye |
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