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PROJECT NAME
APOLLO MK. I
BASED ON
Catalinbread
WIIO
®
EFFECT TYPE
Overdrive / Amp Emulation
PROJECT SUMMARY
An adaptation of the Hiwatt amplifier used by Pete Townshend of The Who during their "Live at Leeds"
performance from 1970.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
This documentation is for the Mk. I version of the project. There is also a
the RAH. While the names are similar, the circuit and part numbering are different. Please be sure
your PCB is labeled "Apollo Mk. I" before proceeding with this build document.
APOLLO PREAMP DRIVE MK. I
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2021-02-19)
IMPORTANT NOTE
Mk. II
version, based on
1
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Table of Contents
Related Manuals for aion Apollo Mk I
Summary of Contents for aion Apollo Mk I
- Page 1 PROJECT NAME APOLLO MK. I BASED ON BUILD DIFFICULTY Catalinbread WIIO ® Intermediate EFFECT TYPE DOCUMENT VERSION Overdrive / Amp Emulation 1.0.0 (2021-02-19) PROJECT SUMMARY An adaptation of the Hiwatt amplifier used by Pete Townshend of The Who during their “Live at Leeds” performance from 1970.
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Page 2: Table Of Contents
The Apollo Mk. I is a direct adaptation of the V2 WIIO (non-limited version). The only modification is the addition of a trimmer that makes a feedback resistor variable, allowing adjustments to the gain, tone and feel of the circuit. The RAH is also available from Aion FX as the Apollo Mk. -
Page 3: Parts List
PARTS LIST This parts list is also available in a spreadsheet format which can be imported directly into Mouser for easy parts ordering. Mouser doesn’t carry all the parts (most notably potentiometers) so the second tab lists all the non-Mouser parts as well as sources for each. →... - Page 4 PARTS LIST, CONT. PART VALUE TYPE NOTES Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 470pF MLCC capacitor, NP0/C0G 100n Film capacitor, 7.2 x 2.5mm 100uF Electrolytic capacitor, 6.3mm 470n Film capacitor, 7.2 x 3mm 10uF Electrolytic capacitor, 5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 47uF...
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Page 5: Build Notes
BUILD NOTES Setting feedback trimmer The WIIO circuit contains a global feedback loop similar to the amplifier it’s based on. A 200k resistor and 470n capacitor send the output from the third stage back to the point just after the gain control between the first and second stage, which reduces the gain, cuts some of the top end, and makes it feel more “amp-like”. -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 47uF 100n BS170 BS170 BS170 270pF 100uF 100uF 100uF FEEDBACK 470n 250k APOLLO PREAMP DRIVE MK. I... -
Page 7: Drill Template
DRILL TEMPLATE Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended to first use a center punch for each of the holes to help guide the drill bit. Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring the scale on the printed page. -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B APOLLO PREAMP DRIVE MK. I... -
Page 9: Wiring Diagram
WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B APOLLO PREAMP DRIVE MK. I... -
Page 10: Document Revisions
LICENSE & USAGE No direct support is offered for these projects beyond the provided documentation. It’s assumed that you have at least some experience building pedals before starting one of these. Replacements and refunds cannot be offered unless it can be shown that the circuit or documentation are in error. All of these circuits have been tested in good faith in their base configurations.
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