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PROJECT NAME
LITHIUM
BASED ON
Electro-Harmonix® Small Clone
EFFECT TYPE
Chorus
PROJECT SUMMARY
An early BBD-based analog chorus most notably used by Kurt Cobain for much of Nevermind.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.86" (bypass board).
LITHIUM ANALOG CHORUS
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.1 (2022-10-21)
1
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Summary of Contents for aion LITHIUM
- Page 1 EFFECT TYPE DOCUMENT VERSION Chorus 1.0.1 (2022-10-21) PROJECT SUMMARY An early BBD-based analog chorus most notably used by Kurt Cobain for much of Nevermind. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board). LITHIUM ANALOG CHORUS...
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Page 2: Table Of Contents
The Lithium is an expanded adaptation of the MN3007 Small Clone, with the addition of a Depth control (converted from a switch) and a Mix control. If you want to read more on the changes, the build notes are extensive, so there are plenty of details for the curious. -
Page 3: Parts List
Metal film resistor, 1/4W 180k Metal film resistor, 1/4W Metal film resistor, 1/4W 120k Metal film resistor, 1/4W 470k Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W LITHIUM ANALOG CHORUS... - Page 4 Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm 100n MLCC capacitor, X7R 1N5817 Schottky diode, DO-41 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 2N5087 BJT transistor, PNP, TO-92 2N5088 BJT transistor, NPN, TO-92 2N5088 BJT transistor, NPN, TO-92 LITHIUM ANALOG CHORUS...
- Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. LITHIUM ANALOG CHORUS...
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Page 6: Build Notes
We have experimentally included the same standard MN3007/MN3207 conversion jumpers on the Lithium PCB, although it should be stressed that we have not tested this and it may be wildly deficient for this circuit. It’s possible that the input biasing network (bias trimmer through R14) would need additional changes in order to work properly. - Page 7 Note that the modern Small Clones also change R8 to 9k1 to add back some of the brightness that is lost by the capacitor change. This is sort of a hack on EHX’s part since it puts the pre/de-emphasis filters LITHIUM ANALOG CHORUS...
- Page 8 You can also use two 4.7uF electrolytic capacitors wired in series, with the negative legs going to the pads of C14 and the positive legs tied together. This will give an effective capacitance of 2.35uF, which is well within tolerance. LITHIUM ANALOG CHORUS...
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Page 9: Schematic
RC4558P OMIT OMIT GND2 2N5088 1N914 2N5087 180pF MN3007 470pF GND2 GND2 GND2 RATE GND2 GND2 SW1B GND2 2.2uF BP CD4047BE GND2 SW1A 470k GND2 IC3B 47pF 100pF 120k IC3A LM358N LM358N GND2 10uF GND2 GND2 GND2 LITHIUM ANALOG CHORUS... -
Page 10: Drill Template
125B INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” DEPTH RATE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” LITHIUM ANALOG CHORUS... -
Page 11: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B LITHIUM ANALOG CHORUS... -
Page 12: Wiring Diagram
WIRING DIAGRAM GND NC OUT GND +V +V JACK GND JACK GND GND PCB 125B LITHIUM ANALOG CHORUS... -
Page 13: Document Revisions
Changed recommendation for IC3 to LM358 as used in the original. The TL022 is usually an upgrade for LFOs, but in this circuit it seems to sometimes cause issues with the travel of the Depth pot. 1.0.0 (2022-09-24) Initial release—and incidentally, the 31st anniversary of the release of Nevermind. LITHIUM ANALOG CHORUS...
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