Akashic Guitar effects circuit lookup
TREBLEBASSMIDSLOPE

125B · 4 knobs

God City Instruments

Decker

Category
EQ / Filter
Controls
Treble · Bass · Mid · Slope
Price
$10.00in stock

From the vendor

3-band passive EQ

Decker is a simple FMV EQ circuit similar to the tone stack found in many classic amps. A volume trim control is also available on the front panel to compensate for any loss or boost in volume caused by equalization. The op amp stages of this circuit can easily be tuned to provide a healthy amount of boost and/or overdrive if so desired. It can be built as a stand-alone pedal or as an add-on to a gain circuit in need of amp-like EQ. By adjusting values, a wide range of tonal options are available.

Sale is for PCB only. You must source the components and build the pedal yourself. To make foot switch wiring easier, we also suggest you buy the 3pdt utility switch.

Build documentation can be found here below. Please read before purchasing.

Decker Build Guide

For your convenience, a parts kit can be purchased here:

http://smallbear-electronics.mybigcommerce.com/kit-decker-pcb-not-included/

Share your work, get tips, ask questions and help troubleshoot at our Facebook Group. Don't forget to agree to the group rules if you wish to join. GCI DIY PCB builders group

NOT FOR COMMERCIAL USE

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 38 rows

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RefValueNormalizedTypeNotes
Resistors 12
CLR4.7k4.7k1/4 watt resistor 1k-10k Current limiting resistor for LED
R11M1M1/4 watt resistor 2.2M Pull down resistor
R210k10k1/4 watt resistor
R310k10k1/4 watt resistor
R410k10k1/4 watt resistor 1k-47k Lower for more output gain and op amp clipping.
R510k10k1/4 watt resistor 1k-47k Lower for more input gain and op amp clipping.
R6100k100k1/4 watt resistor
R71k1k1/4 watt resistor
R810k10k1/4 watt resistor
R91M1M1/4 watt resistor
R1010k10k1/4 watt resistor
R11100k100k1/4 watt resistor
Capacitors 12
C10.47u470nFilm cap See Duncan TSC
C247n47nFilm cap 10n-0.1u Input cap. Forms HPF with R9.
C3100u100uElectrolytic cap
C40.1u100nFilm cap
C5100u100uElectrolytic cap
C61u1uFilm cap
C74.7n4.7nFilm cap See Duncan TSC
C80.33u330nFilm cap See Duncan TSC
C92.2n2.2nFilm cap 1n-4.7n Forms input LPF with R10.
C100.1u100nMLCC
C11100p100pMLCC 220p-1n Raise if using smaller R4 values.
C121u1uFilm cap
Diodes 1
D11n58181N5818Schottky diode 1n5817, 1n4001, bat41 Any suitableprotection diode for 9v.
ICs 1
ICLM833LM833Dual Op Amp TL072, OPA2134, etc Any pin compatible dual op amp
Potentiometers 4
TREBLEB25kB25kPotentiometers See Duncan TSC
BASSA100kA100kPotentiometers See Duncan TSC
MIDB5kB5kPotentiometers See Duncan TSC
SLOPEA10kA10kPotentiometers See Duncan TSC
Trimmers 1
TRIMA100k100kPotentiometers
Switches 1
SPADPADSend to PCB
LEDs 3
LEDL1L1LED
L+PADPADLED+
L-PADPADLED-
Other 3
RPADPADReturn from PCB
VPADPAD9v input
GPADPADGround