Akashic Guitar effects circuit lookup
DELTADEPTH 1DEPTH 2SPEED 1SPEED 2

Enclosure not stated · 5 knobs

Scientific Guitarist

Soliton MultivibeA True Classic with Modern Features

Controls
Delta · Depth 1 · Depth 2 · Speed 1 · Speed 2
Price
see vendor

From the vendor

I have to admit that I love a good vibe pedal. There are many excellent ones out there that do a great job getting those classic tones. However, I had the thought that it would be really cool to have the option of creating more complex movement of the phasing in a vibe pedal and decided that doing digital control would allow for some really fun flexibility.

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The digital control is a primary distinguishing feature of the Soliton. An ATTiny85 produces the LFO using the input from a potentiometer. The code has been made flexible enough to allow for a wide range of LFO shapes: sine, triangle, square, rising sawtooth, falling sawtooth, or even arbitrary shapes. The LFO shape is stored in the code as a wave table that is used for creating the LFO output voltage. Digital control also allows for specifying multiple modes and including tap tempo. Further modifications are possible to make it t

Schematic

The schematic is in the vendor's build document, page 1. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 62 rows

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RefValueNormalizedTypeNotes
Resistors 19
R11M1M
R21M1M
R310k10k
R410k10k
R547k47k
R647k47k
R710k10k
R847k47k
R915k15k
R1022k22k
R1147k47k
R1247k47k
R1347k47k
R1447k47k
R1547k47k
R16100k100k
R17100k100k
R1810k10k
R1956k56k
Capacitors 15
C1100n100n
C2100u100u
C347u47u
C415n15n
C5100u100u
C6100n100n
C7220n220n
C8100p100p
C94n74.7n
C10100u100u
C11470p470p
C12100u100u
C131u1u
C14470p470p
C151u1u
Diodes 1
D11N400x, 1N58171N400X / 1N5817
ICs 4
IC1TL072PTL072P
IC278L05Z78L05Z
IC3TL074PTL074P
U1ATTINY85-20PUATTINY85-20PU
Opto 4
LDR1KE-10720KE-10720
LDR2KE-10720KE-10720
LDR3KE-10720KE-10720
LDR4KE-10720KE-10720
Potentiometers 5
DELTA25kBB25k
DEPTH125kCC25k
DEPTH225kCC25k
SPEED110kBB10k
SPEED210kBB10k
Trimmers 2
OUT_TRIM100k100kTrimmer
RLED10k10kTrimmer
Switches 2
MODESPDTSPDT
SWLSP10LSP10
LEDs 4
D2LEDLED
D3LEDLED
D4LEDLED
LEDLSP10LSP10
Other 6
+9VLSP10LSP10
GNDLSP10LSP10
GND_INLSP10LSP10
GND_OUTLSP10LSP10
INLSP10LSP10
OUTLSP10LSP10