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Aion Electronics MERIDIAN Manual

Guitar exciter / compressor

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PROJECT NAME
MERIDIAN
BASED ON
PS-021 Guitar Exciter / Compressor
EFFECT TYPE
Compressor, frequency enhancer
PROJECT SUMMARY
A gem from the 1980s, this effect combines a Dyna-style compressor with an exciter that enables
control over the even & odd harmonics.
Actual size is 2.3" x 2.43" (main board) and 1.78" x 0.86" (bypass board).
MERIDIAN EXCITER / COMPRESSOR
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2019-08-31)
1

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Summary of Contents for Aion Electronics MERIDIAN

  • Page 1 A gem from the 1980s, this effect combines a Dyna-style compressor with an exciter that enables control over the even & odd harmonics. Actual size is 2.3” x 2.43” (main board) and 1.78” x 0.86” (bypass board). MERIDIAN EXCITER / COMPRESSOR...
  • Page 2 Big Muff. The Meridian is a direct clone of the original PS-021 and PS-020 except for two changes. First, it’s been converted to true bypass and the JFET switching has been removed. Second, the obsolete CA3080 chip has been replaced by the current-production LM13700, which performs identically.
  • Page 3 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 Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W MERIDIAN EXCITER / COMPRESSOR...
  • Page 4 Film capacitor, 7.2 x 3.5mm 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor. 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. MERIDIAN EXCITER / COMPRESSOR...
  • 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. MERIDIAN EXCITER / COMPRESSOR...
  • Page 6 The compressor portion of the circuit is identical to the classic Ross / Dyna Comp circuit, except that the sustain control has more limited range in the PS-021. But, it can easily be modified to give a more Dyna- style effect. Change R8 to 27k and the Sustain pot to 500kC. MERIDIAN EXCITER / COMPRESSOR...
  • Page 7 SCHEMATIC 1N5817 100uF 100n IC1A LM13700N 47uF 47uF BIAS 10uF GND GND SUSTAIN IC1B LM13700N IC1_BUF2 LM13700N IC1_BUF1 LM13700N 25kB EXCITER IC3A IC3B IC4A IC2B IC2A 100k Q1-Q6: 2N5088 IC4B IC1: LM13700 IC2-4: JRC4558D MERIDIAN EXCITER / COMPRESSOR...
  • Page 8 SUSTAIN x: -0.65, y: +1.71 x: +0.65, y: +1.71 ø9/32” ø9/32” COLOR EXCITER x: -0.65, y: +0.41 x: +0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” MERIDIAN EXCITER / COMPRESSOR...
  • Page 9 ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B MERIDIAN EXCITER / COMPRESSOR...
  • Page 10 WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B MERIDIAN EXCITER / COMPRESSOR...
  • Page 11 (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 (2019-08-31) Initial release. MERIDIAN EXCITER / COMPRESSOR...