GuitarPCB releases NostalgiTone Space Modulator DIY build document

September 1, 2024 · 1 sources

GuitarPCB published the build document for the NostalgiTone Space Modulator in September 2024. The document describes a do-it-yourself combo build in the NostalgiTone series that combines delay, reverb and chorus in one pedal¹.

The delay uses a PT2399 chip with a maximum delay time of up to 600 milliseconds, and the document says pushing the chip to that limit may introduce subtle artifacts that vary with each chip's tolerance. It offers a modification to cap the maximum at 500 milliseconds by soldering a 150k resistor between lugs 1 and 2 of the Time potentiometer. The delay has a four-knob layout for Time, Repeats, Tone and Mix, and chorus modulation can be added with Width and Rate controls¹. The reverb circuit uses the Belton BTDR-3H Brick, with Depth, Rate and Darken controls. The chorus has Rate and Depth controls¹.

Each of the three circuits has its own trim pot, labeled VOL1 to VOL3, to set volume. The document suggests starting points of Chorus at 11:00, Delay at 12:00 and Reverb at 2:00, then adjusting by ear against the bypassed signal¹. The main PCB ships with three standard footswitch wiring boards (6 pins) and three pieces of ribbon connector. Each wiring board needs a current limiting resistor for its status LED, with a value between 1k8 and 4k7¹. The document specifies a 9-volt power supply with a 2.1mm plug and negative tip, capable of at least 100mA¹.

The document lists IC2 and IC3 as PT2399 and IC7 as the Belton Reverb Brick model BTDR-3, with RC4558 suggested for IC1, IC3, IC4 and IC6. It notes a slightly higher component count than previous NostalgiTone releases and describes the build as step-by-step¹. No price or release date for the board is given in the document.