Akashic Guitar effects circuit lookup
HIGH PASSMIDLOW PASSHIGH FREQUENCYMID FREQUENCYLOW FREQUENCY

125B · 6 knobs

PedalPCB· PCB725

Referee EQ

Based on the Broughton Audio Resonant Filter Equalizer· 1 other board clones it

Category
EQ / Filter
Controls
High Pass · Mid · Low Pass · High Frequency · Mid Frequency · Low Frequency
Price
$12.00in stock
Tags
125B, 125B 6-Knob (Type 1), Bass
Buy the PCB at PedalPCB Build document4/29/26

From the vendor

Controls

• High Pass

• Mid

• Low Pass

• High Frequency

• Mid Frequency

• Low Frequency

Details

• Designed for a 125B enclosure with top-mounted jacks

The company, product and service names used in this web site are for comparative purposes only. All trademarks and registered trademarks are the property of their respective owners. This product is not manufactured or distributed by Broughton Audio, maker of the Broughton Audio Resonant Filter Equalizer.

PedalPCB is in no way affiliated with Broughton Audio.

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 52 rows

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RefValueNormalizedTypeNotes
Resistors 28
R11K1kResistor, 1/4W
R22M2MResistor, 1/4W
R32M2MResistor, 1/4W
R410K10kResistor, 1/4W
R5470R470Resistor, 1/4W
R610K10kResistor, 1/4W
R715K15kResistor, 1/4W
R810K10kResistor, 1/4W
R910K10kResistor, 1/4W
R1015K15kResistor, 1/4W
R1110K10kResistor, 1/4W
R12470R470Resistor, 1/4W
R1310K10kResistor, 1/4W
R1415K15kResistor, 1/4W
R1510K10kResistor, 1/4W
R1612K12kResistor, 1/4W
R1712K12kResistor, 1/4W
R182K72.7kResistor, 1/4W
R195K65.6kResistor, 1/4W
R2010K10kResistor, 1/4W
R212K72.7kResistor, 1/4W
R2215K15kResistor, 1/4W
R23100K100kResistor, 1/4W
R24100R100Resistor, 1/4W
R10047R47Resistor, 1/4W
R10110K10kResistor, 1/4W
R10210K10kResistor, 1/4W
CLR4K74.7kResistor, 1/4W* LED current limiting resistor
Capacitors 13
C1100n100nFilm capacitor, 7.2 x 2.5mm
C2100u100uElectrolytic capacitor, 5mm
C34n74.7nFilm capacitor, 7.2 x 2.5mm
C44n74.7nFilm capacitor, 7.2 x 2.5mm
C5100u100uElectrolytic capacitor, 5mm
C66n86.8nFilm capacitor, 7.2 x 2.5mm
C76n86.8nFilm capacitor, 7.2 x 2.5mm
C856n56nFilm capacitor, 7.2 x 2.5mm
C910u10uElectrolytic capacitor, 5mm
C101u1uElectrolytic capacitor, 5mm
C1156n56nFilm capacitor, 7.2 x 2.5mm
C100100u100uElectrolytic capacitor, 5mm
C101100u100uElectrolytic capacitor, 5mm
Diodes 1
D1001N58171N5817Schottky diode, DO-41
ICs 4
IC1TL072TL072Dual op-amp, DIP8
IC2TL072TL072Dual op-amp, DIP8
IC3TL072TL072Dual op-amp, DIP8
IC4TL072TL072Dual op-amp, DIP8
Potentiometers 6
HP_FREQA100KA100k16mm right-angle PCB mount pot, dual*Dual gang potentiometer
MID_FREQA100KA100k16mm right-angle PCB mount pot, dual*Dual gang potentiometer
LP_FREQA100KA100k16mm right-angle PCB mount pot, dual*Dual gang potentiometer
HPC10KC10k16mm right-angle PCB mount pot
MIDB10KB10k16mm right-angle PCB mount pot
LPC10KC10k16mm right-angle PCB mount pot

Other boards based on the Broughton Audio Resonant Filter Equalizer