Aion Electronics PRISM 매뉴얼 - 페이지 2

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Aion Electronics PRISM 매뉴얼

TABLE OF CONTENTS

1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Prism FET Amplifier is a pedal conversion of the obscure but highly sought-after BOSS
Amplifier. The original, which was manufactured from 1980 to 1984, was an always-on effect that
clipped to your belt and ran on a 9-volt battery.
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.
The original FA-1 used the long-obsolete HA1457W chip, which is a single version of the LM1458 (as
evidenced by the similarity of "1457" and "1458", and similar datasheet specifications). For the updated
version of the Prism, extensive A/B testing was done to verify that the LM1458 performs exactly the
same as two HA1457Ws and is sonically indistinguishable.
As a result, this new version eliminates the option to use the HA1457W and only supports dual op-
amps. However, the
HA1457W.
USAGE
The Prism has the following controls:
• Treble and Bass form a Baxandall EQ allowing for adjustment of the respective frequencies.
• Volume controls the overall output of the effect, from zero to approximately 26dB of gain.
• Low Cut toggle engages a filter that cuts bass frequencies below 200 Hz at -6dB/octave.
PRISM FET AMPLIFIER
previous version of the Prism
9 Licensing
is still available if you really do want to use the
®
FA-1 FET
2