Akashic Guitar effects circuit lookup

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Experimentalists Anonymous

Electro Harmonix Guitar Synth

Based on the Electro-Harmonix Guitar Synth

Category
Ring Mod / Synth· Guitar Synth and Misc Signal Shapers
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Guitar Synth and Misc Signal Shapers

Schematic

The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.

Parts list 234 rows

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Check before you build · 8 values the reader of this schematic was not sure of
  • All counts: hand-drawn sheet with no R/C/D designators; values tallied by eye, so a few parts may be over- or under-counted
  • IC113/IC114/IC301-IC304: drawn '1048', type unclear
  • 1N965B: zener marking hard to read
  • '.33' cap at IC103 and '.0039uF' chorus cap: units/digits uncertain
  • 2.2pF comparator caps drawn '2.2pf' (could be 2.2uF)
  • VCO1 '+10µf' cap could be 10pF
  • Filter/Synth switch pole counts estimated
  • Initial Gain pot value not drawn
RefValueNormalizedTypeNotes
Resistors 87
×14K74.7kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×168Ω68board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×2680Ω680board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×41K1kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×22K42.4kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×14K34.3kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×25K65.6kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×18K28.2kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1010K10kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×312K12kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×113K13kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×115K15kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×118K18kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×220K20kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×522K22kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×124K24kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×327K27kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×130K30kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×447K47kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×8100K100kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1120K120kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×3200K200kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×3270K270kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1330K330kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×4470K470kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1680K680kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1750K750kboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1??board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); one resistor by IC104A has no value drawn; read from the schematic by eye
×1160Ω160board 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×2330Ω330board 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×14K34.3kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×46K86.8kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×510K10kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×122K22kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×233K233.2kboard 2 (VCO1-3, freq-to-voltage, noise); 1%; read from the schematic by eye
×243K43kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×447K47kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×275K75kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×190K90kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×3100K100kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×2120K120kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×3200K200kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×2221K221kboard 2 (VCO1-3, freq-to-voltage, noise); 1%; read from the schematic by eye
×1270K270kboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×11M1Mboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×16M86.8Mboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×1??board 2 (VCO1-3, freq-to-voltage, noise); VCO3 comparator output resistor, no value drawn; read from the schematic by eye
×2360Ω360board 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1680Ω680board 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×91K1kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×11K51.5kboard 3 (VCF, exp converter, VCA, chorus, output); panel filter-mode input; read from the schematic by eye
×11K81.8kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×13K33.3kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×14K74.7kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×57K57.5kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×18K28.2kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×19K19.1kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×510K10kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×313K13kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×315K15kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×222K22kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×224K24kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×227K27kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×330K30kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×133K33kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×143K43kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×747K47kboard 3 (VCF, exp converter, VCA, chorus, output); six 2%; read from the schematic by eye
×951K51kboard 3 (VCF, exp converter, VCA, chorus, output); panel mixer; read from the schematic by eye
×256K56kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×162K62kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×3100K100kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1120K120kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1150K150kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1220K220kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×2470K470kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1560K560kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×2910K910kboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×11K81.8kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×52K2kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×42K72.7kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×14K74.7kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×230K30kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×291K91kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×7100K100kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×2300K300kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×1470K470kenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×2??envelope generators (IC402 VCA env, IC403 VCF env); no value drawn: VCF env inner feedback (likely 100K), resistor above Initial Gain pot; read from the schematic by eye
Capacitors 48
×210pF10pboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1.0022uF2.2nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×4.01uF10nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); ceramic; read from the schematic by eye
×1.022uF22nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×2.033uF33nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1.056uF56nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1.068uF68nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×3.1uF100nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1.18uF180nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×1.33uF330nboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); drawn '.33' at IC103; read from the schematic by eye
×21uF1uboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×22.2uF2.2uboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); tantalum, back to back; read from the schematic by eye
×310uF10uboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); two tantalum supply caps; read from the schematic by eye
×1??board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); input coupling electrolytic, no value drawn; read from the schematic by eye
×22.2pF2.2pboard 2 (VCO1-3, freq-to-voltage, noise); comparator hysteresis caps, drawn '2.2pf'; read from the schematic by eye
×410pF10pboard 2 (VCO1-3, freq-to-voltage, noise); mica; read from the schematic by eye
×168pF68pboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×1100pF100pboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×3.0018uF1.8nboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×2.0022uF2.2nboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×1.0047uF4.7nboard 2 (VCO1-3, freq-to-voltage, noise); read from the schematic by eye
×3.01uF10nboard 2 (VCO1-3, freq-to-voltage, noise); two ceramic supply bypass; read from the schematic by eye
×1.1uF100nboard 2 (VCO1-3, freq-to-voltage, noise); noise source; read from the schematic by eye
×21uF1uboard 2 (VCO1-3, freq-to-voltage, noise); one tantalum ±10%; read from the schematic by eye
×110uF10uboard 2 (VCO1-3, freq-to-voltage, noise); VCO1 ramp node, drawn '+10µf'; read from the schematic by eye
×2470uF470uboard 2 (VCO1-3, freq-to-voltage, noise); supply; read from the schematic by eye
×1150pF150pboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1180pF180pboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.0022uF2.2nboard 3 / panel; guitar input to fuzz switch, across 51K; read from the schematic by eye
×2.001uF1nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.0033uF3.3nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.0039uF3.9nboard 3 (VCF, exp converter, VCA, chorus, output); drawn '.003?µf'; read from the schematic by eye
×4.0047uF4.7nboard 3 (VCF, exp converter, VCA, chorus, output); 5% mylar; read from the schematic by eye
×1.0082uF8.2nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×4.01uF10nboard 3 (VCF, exp converter, VCA, chorus, output); two ceramic supply bypass; read from the schematic by eye
×2.015uF15nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.027uF27nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×2.047uF47nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×4.1uF100nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.15uF150nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.22uF220nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×1.33uF330nboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×21uF1uboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×24.7uF4.7uboard 3 (VCF, exp converter, VCA, chorus, output); tantalum, back to back; read from the schematic by eye
×610uF10uboard 3 (VCF, exp converter, VCA, chorus, output); two NP back to back; two tantalum supply; read from the schematic by eye
×122uF22uboard 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×2.01uF10nenvelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×22.2uF2.2uenvelope generators (IC402 VCA env, IC403 VCF env); one tantalum; read from the schematic by eye
Diodes 6
×26DiodeDIODEboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); no part number given; read from the schematic by eye
×1DiodeDIODEboard 2 (VCO1-3, freq-to-voltage, noise); no part number given; read from the schematic by eye
×11N965B1N965B / 15Vboard 3 (VCF, exp converter, VCA, chorus, output); zener, part number hard to read; read from the schematic by eye
×11N40011N4001board 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×8DiodeDIODEenvelope generators (IC402 VCA env, IC403 VCF env); no part number given; read from the schematic by eye
×21N36661N3666envelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
Transistors 9
×22N50872N5087board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×22N50882N5088board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); read from the schematic by eye
×12N4859A2N4859Aboard 1 (envelope detector, fuzz, muting, loop control, adaptive filter); JFET; read from the schematic by eye
×42N4859A2N4859Aboard 2 (VCO1-3, freq-to-voltage, noise); JFET; read from the schematic by eye
×22N50872N5087board 2 (VCO1-3, freq-to-voltage, noise); noise source; read from the schematic by eye
×42N50872N5087board 3 (VCF, exp converter, VCA, chorus, output); two in exp converter, mute, VCA driver; read from the schematic by eye
×12N50882N5088board 3 (VCF, exp converter, VCA, chorus, output); read from the schematic by eye
×12N4859A2N4859Aboard 3 (VCF, exp converter, VCA, chorus, output); JFET; read from the schematic by eye
×52N50882N5088envelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
ICs 40
IC10145584558dual op amp (A input buffer, B fuzz stage); read from the schematic by eye
IC10214581458envelope detector; read from the schematic by eye
IC103CA3080CA3080OTA; read from the schematic by eye
IC10414581458read from the schematic by eye
IC105CD4098CD4098dual monostable; read from the schematic by eye
IC106311311comparator; read from the schematic by eye
×131403140board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); unlabeled op amp after 2N4859A (muting control); read from the schematic by eye
×1311311board 1 (envelope detector, fuzz, muting, loop control, adaptive filter); unlabeled comparator feeding IC109 (loop control); read from the schematic by eye
IC109TL601TL601analog switch; read from the schematic by eye
IC110TL601TL601analog switch; read from the schematic by eye
IC11114581458adaptive filter; read from the schematic by eye
IC112741741read from the schematic by eye
IC11310481048as drawn; type unclear; read from the schematic by eye
IC11410481048as drawn; type unclear; read from the schematic by eye
IC115311311read from the schematic by eye
IC20140304030quad XOR (input squarer and ring mod); read from the schematic by eye
IC20240474047read from the schematic by eye
IC20340474047read from the schematic by eye
×331403140board 2 (VCO1-3, freq-to-voltage, noise); unlabeled (two in freq-to-voltage, one VCO1); read from the schematic by eye
×2311311board 2 (VCO1-3, freq-to-voltage, noise); unlabeled (VCO1 core, VCO3 core); read from the schematic by eye
IC20631403140read from the schematic by eye
IC208311311read from the schematic by eye
IC211311311read from the schematic by eye
IC21231403140read from the schematic by eye
IC21340664066sign changer; read from the schematic by eye
IC21431403140read from the schematic by eye
IC215311311read from the schematic by eye
IC30110481048VCF stage; as drawn; read from the schematic by eye
IC30210481048VCF stage; read from the schematic by eye
IC30310481048VCF stage; read from the schematic by eye
IC30410481048VCF stage; read from the schematic by eye
IC30545584558read from the schematic by eye
IC30630803080OTA (VCA); read from the schematic by eye
IC30745584558chorus LFO; read from the schematic by eye
IC308MN3007MN3007BBD; read from the schematic by eye
×14047BE4047BEboard 3 (VCF, exp converter, VCA, chorus, output); chorus clock; read from the schematic by eye
IC31045584558read from the schematic by eye
IC40145584558A master out, B VCF summer; read from the schematic by eye
IC40245584558read from the schematic by eye
IC40345584558read from the schematic by eye
Potentiometers 22
Guitar VolumeA10KA10kPotentiometerread from the schematic by eye
SensitivityA10KA10kPotentiometerread from the schematic by eye
PortamentoB100KB100kPotentiometerread from the schematic by eye
VCO1 VolumeB100KB100kPotentiometerread from the schematic by eye
VCO2 VolumeB100KB100kPotentiometerread from the schematic by eye
VCO3 VolumeB100KB100kPotentiometerread from the schematic by eye
Ring Mod VolA10KA10kPotentiometerread from the schematic by eye
Noise VolumeA10KA10kPotentiometerread from the schematic by eye
VCO1 CoarseA10KA10kPotentiometerread from the schematic by eye
VCO1 FineB10KB10kPotentiometerread from the schematic by eye
VCO2 CoarseA10KA10kPotentiometerread from the schematic by eye
VCO2 FineB10KB10kPotentiometerread from the schematic by eye
QB100KB100kPotentiometerread from the schematic by eye
Pulse WidthB100KB100kPotentiometerread from the schematic by eye
Master VolumeA10KA10kPotentiometerread from the schematic by eye
VCA AttackA100KA100kPotentiometerread from the schematic by eye
VCA DecayA100KA100kPotentiometerread from the schematic by eye
VCF AttackA100KA100kPotentiometerread from the schematic by eye
VCF DecayA100KA100kPotentiometerread from the schematic by eye
Initial Gain??Potentiometerno value drawn; read from the schematic by eye
Sweep RangeB10KB10kPotentiometerread from the schematic by eye
Initial TuneB10KB10kPotentiometerread from the schematic by eye
Trimmers 5
×1??board 2 freq-to-voltage trim (11), no value; read from the schematic by eye
×550K50kboard 2: two in freq-to-voltage, VCO1, IC206, IC214; read from the schematic by eye
×1100K100kboard 3 Lo Trim (exp converter); read from the schematic by eye
×15K5kboard 3 chorus (9); read from the schematic by eye
×1100K100kboard 3 chorus (8); read from the schematic by eye
Switches 15
FuzzSPDTSPDTread from the schematic by eye
SynthDPDTDPDTguitar on/synth; read from the schematic by eye
VCO1 WaveSPDTSPDTpulse/saw; read from the schematic by eye
VCO2 WaveSPDTSPDTsquare/triangle; read from the schematic by eye
VCO3 WaveSPDTSPDTsquare/saw; read from the schematic by eye
SyncSPSTSPSTread from the schematic by eye
FilterDPDTDPDTx4: VCO1, VCO2, VCO3, ring mod on/filter routing; pole count estimated; read from the schematic by eye
Filter ModeSPDTSPDTLP/BP; read from the schematic by eye
Filter TrackSPSTSPSTread from the schematic by eye
ChorusSPDTSPDToff/on; read from the schematic by eye
PWMSPSTSPSTread from the schematic by eye
Dynamic ResponseSPDTSPDTread from the schematic by eye
VCA AR/LFODPDTDPDTread from the schematic by eye
VCF AR/LFODPDTDPDTread from the schematic by eye
Envelope FollowerSPDTSPDTenvelope follower/sweep; read from the schematic by eye
LEDs 2
×1NSL5046NSL5046envelope generators (IC402 VCA env, IC403 VCF env); read from the schematic by eye
×2LEDLEDenvelope generators (IC402 VCA env, IC403 VCF env); no part number given; read from the schematic by eye