Akashic Guitar effects circuit lookup
1

Enclosure not stated

Griffin Effects

SP-1 Spectrum

Based on the Boss SP-1 Spectrum· 4 other boards clone it

Category
EQ / Filter
Difficulty
Intermediate
Price
$11.00in stock
Buy the PCB at Griffin Effects Build document

From the vendor

The SP-1 is a parametric equalizer with one frequency band only. The spectrum knob sets the frequency range in the interval 500Hz to 5kHz. The balance knob sets the peak within the range. Today it is one of the most sought after collectors items and a mint condition SP-1 doesn't come cheap so build your own for a fraction of the price!

The original unit used dual potentiometers and the Balance one was a 10KA/10KC. We modified the circuit board to use a standard 10KA/10KA dual potentiometer. The circuit functions exactly the same. Just no need for a special/hard to get potentiometer.

Controls: Balance, Spectrum Current Draw: 23mA Input Impedance: 1 Mohm Output Impedance: 1 kohm PCB: Manufac

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 34 rows

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RefValueNormalizedTypeNotes
Resistors 18
R11K1k
R2470K470k
R310K10k
R410K10k
R51K1k
R610K10k
R718K18k
R810K10k
R922K22k
R1010K10k
R1110K10k
R1210K10k
R13470E470
R14100K100k
R1533K33k
R1633K33k
R173K33.3k
R181M1M
Capacitors 12
C1.047µ47n
C24µ74.7u
C34µ74.7u
C40.1µ100n
C5.0033µ3.3n
C6.0033µ3.3n
C71µ1u
C84µ74.7u
C947p47p
C101µ1u
C11100µ100u
C1247µ47u
Diodes 1
D11N40011N4001
ICs 1
IC1RC3403A*RC3403A
Potentiometers 1
VR11K1k
LEDs 1
D2LEDLED

Other boards based on the Boss SP-1 Spectrum