aion Ephemeris Manuel - Page 2
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Imprimer la pageTABLE OF CONTENTS
1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Ephemeris JFET Booster is based on the Xotic EP Booster, a one-knob boost first released in 2009
that is loosely based on the preamp section of the Echoplex EP-3 tape delay. There have been some
minor changes to the circuit throughout production, but
the most accurate representation of the circuitr.
In addition to the gain knob, the original EP Booster also has a DIP switch on the inside with two
additional settings. In the stock circuit, the minimum gain setting is +3dB above unity. One of the DIP
switch settings adds a resistor at the output that essentially just turns down the volume and sets the
minimum gain position at unity gain instead.
The second mode disables a treble-cut filter. This could be called a treble boost, but in practice it
provides something more like a flat response while the stock mode has a slight cut above 3.2kHz for a
vintage-sounding warmth.
The Ephemeris moves the treble cut to a front-panel control, and replaces the fixed resistors at the
output with a true volume control. The gain and volume controls are somewhat redundant, but at high
gain levels it's possible to get the second transistor to clip, so different combinations of gain & volume
can yield different tones. You can still dial back to unity gain as well, so the pedal can be used as a tone
enhancer or buffer.
We have also ported the "Bass" switch from the earlier version of the EP Booster, and added a third
position which cuts bass a bit, inspired by the original EP-3 preamp. More on this in the build notes.
USAGE
The Ephemeris has the following controls:
• Gain sets gain of the JFET stage.
• Volume sets the volume level at the output.
• Bright (toggle switch) disengages a hi-cut filter between the stages.
• Bass (toggle switch) selects the frequency range of the filter, with Low and Hi settings as well as an
in-between Mid.
EPHEMERIS JFET BOOSTER
10 Licensing
we traced one in 2023
to ensure that we had
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