Akashic Guitar effects circuit lookup
LOWERUPPERVOL

Enclosure not stated · 3 knobs

TH Custom Effects

AC-Sim V1.1

Based on the Woody

Category
EQ / Filter
Controls
Lower · Upper · Vol
Price
€7.65in stock

From the vendor

An active acoustic guitar simulator based on the Woody circuit by Mark Hammer. Uses two TL074 quad op-amp ICs to shape the body resonance and string attack of an electric guitar signal, producing a convincing acoustic character without carrying an acoustic instrument. The Ac-Sim is a two-band acoustic guitar simulator based on the well-known Woody circuit by Mark Hammer. All credit for the original circuit design goes to him. The effect shapes an electric guitar signal to produce an acoustic character by independently processing two frequency regions — a lower body resonance band and an upper string attack band — then blending the results. The Lower control manipulates the body resonance of

Schematic

The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 55 rows

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RefValueNormalizedTypeNotes
Resistors 27
R112k12kVirtual ground divider
R212k12kVirtual ground divider
R31M1MInput pull-down to VR
R42M22.2MInput bias resistors
R262M22.2MInput bias resistors
R510k10kInput noise filter
R612k12kIC1B bias
R710k10kIC1B input
R810k10kIC1C summing network
R910k10kIC1C summing network
R1010k10kIC1C summing / feedback
R1122k22kLower band resonance shaping
R1222k22kLower band resonance shaping
R1310k10kIC1D feedback
R14150k150kUpper HP bias resistor
R1610k10kIC2A summing
R1810k10kUpper band summing
R1912k12kUPPER pot load
R2010k10kLower band shaping (IC2B)
R2110k10kLower band shaping (IC2B)
R2210k10kLower band shaping (IC2B)
R233k33.3kLOWER pot series resistor
R2412k12kLower band load
R2522k22kVOL buffer feedback
R2710k10kIC2D bias
R281k1kOutput series resistor
R29100k100kOutput load / impedance
Capacitors 18
C1220u220uMain supply decoupling — polarised electrolytic
C247u47uVR rail decoupling — polarised electrolytic
C310n10nInput coupling — box film
C4680n680nLower band coupling — box film
C53n33.3nLower band resonance caps — box film
C63n33.3nLower band resonance caps — box film
C73n33.3nLower band resonance caps — box film
C8100p100pUpper band HF roll-off — ceramic
C910n10nUpper band coupling — box film
C1039n39nLower band shaping caps — box film
C1139n39nLower band shaping caps — box film
C1239n39nLower band shaping caps — box film
C1339n39nLower band shaping caps — box film
C1410u10uVolume stage coupling — polarised electrolytic
C1510n10nIC2D bias filter — box film
C16680n680nOutput coupling cap — box film
C17330p330pInput noise filter — ceramic
C18470p470pUpper HP trimmer filter — ceramic
Diodes 4
D11N40011N4001Reverse polarity protection
D21N41481N4148Soft clipping in upper band feedback path
D31N41481N4148Soft clipping in upper band feedback path
D41N41481N4148Soft clipping in upper band feedback path
ICs 2
IC1TL074TL074Quad op-amp, DIP-14 — TL074CN RC4136
IC2TL074TL074Quad op-amp, DIP-14 — TL074CN RC4136
Potentiometers 3
LOWERA10kA10kBody resonance control — 16mm board-mount
UPPERA10kA10kString attack / brightness — 16mm board-mount
VOLA100kA100kOutput volume — 16mm board-mount
Trimmers 1
R15500k500kUpper HP corner adjustment — 9mm trimpot