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PROJECT NAME
PRISM
BASED ON
BOSS
®
FA-1 FET Amplifier
EFFECT TYPE
Boost / Preamplifier
PROJECT SUMMARY
An extremely loud and tonally-flexible boost/preamp with a two-band EQ, most notably used by The
Edge of U2.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
PRISM FET AMPLIFIER
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2020-07-03)
1
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Summary of Contents for Aion Electronics PRISM
- Page 1 Boost / Preamplifier 1.0.0 (2020-07-03) PROJECT SUMMARY An extremely loud and tonally-flexible boost/preamp with a two-band EQ, most notably used by The Edge of U2. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). PRISM FET AMPLIFIER...
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Page 2: Table Of Contents
It’s a solid circuit, but the non-standard implementation prevented it from getting much attention— although it was famously used by The Edge which caused vintage prices to skyrocket. The Prism is the same circuit in an alternate format, converting it to a standard pedal with a footswitch, LED and 9V adapter jack. -
Page 3: Parts List
Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 10uF Electrolytic capacitor, 5mm 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor. 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. PRISM FET AMPLIFIER... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. PRISM FET AMPLIFIER...
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Page 5: Schematic
SCHEMATIC 100R 1N5817 100uF 47uF 10uF 100n FLAT/CUT VOLUME BASS 50kB 470k 10uF 2N5457 470n 470k 470R IC1B LM1458N IC1A LM1458N 50kB TREBLE PRISM FET AMPLIFIER... -
Page 6: Drill Template
BASS x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” VOLUME LOW CUT x: 0, y: +0.66 x: +0.85, y: +0.66 ø9/32” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” PRISM FET AMPLIFIER... -
Page 7: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B PRISM FET AMPLIFIER... -
Page 8: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. PRISM FET AMPLIFIER... -
Page 9: Document Revisions
(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.0 (2020-07-03) Initial release. PRISM FET AMPLIFIER...
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