Akashic Guitar effects circuit lookup
DISTORTIONRESPONSELOUDNESSLEVELCLIPMIDDARK

1590BBM · 7 knobs

God City Instruments

Socialist Jr. V1.1

Category
Distortion
Controls
Distortion · Response · Loudness · Level · Clip · Mid · Dark
Price
$10.00in stock

From the vendor

Distortion

The spiritual successor to the one that started it all, Socialist Jr. does the "Brutalist Jr. thing" but with a number of improvements and additional options built right into the PCB. If you're planning on building a highly modified Brutalist Jr., the Socialist Jr. will get you there faster. Here's a quick summary of the changes:

• Moved I/O pads for easier wiring.

• 2nd op amp stage converted to non-inverting to improve bias and make it tolerant to a wider range of dual op amps.

• Gain converted to a dual pot to control two gain stages simultaneously resulting in a much wider range of useable gain settings. (cleans up better) Values scaled to make this work well with readily available, B100k dual pot.

• "Response mod" pot built in.

• "Clipping mod" switch built in.

• Deeper mid-cut with Loudness fully engaged.

• Less volume drop when Loudness is set at minimum. (tone-stack bypass)

• "Mid Shift" switch built in.

• "Bright Switch" added. This was not a common mod in the Brutalist Jr. but it's useful for removing sizzle when loudness is fully engaged.

Sale is for PCB only. You must source the components and build the pedal yourself. Photo of completed pedal is for reference only. Enclosure shown in the completed pedal, courtesy of Acid Rain Pedalworks.

Build documents can be found here. Please read before purchasing.

Socialist Jr. V1.1 Build Guide

Note: V1.0 and V1.1 are mostly compatible. The values shown in V1.1 more closely resemble the original Brutalist Jr. circuit.

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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 64 rows

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RefValueNormalizedTypeNotes
Resistors 22
CLR4.7k4.7k1/4 watt resistor
R11k1k1/4 watt resistor
R22.2M2.2M1/4 watt resistor
R310k10k1/4 watt resistor
R410k10k1/4 watt resistor
R51M1M1/4 watt resistor
R62.2M2.2M1/4 watt resistor
R710k10k1/4 watt resistor
R81k1k1/4 watt resistor
R910k10k1/4 watt resistor
R1022k22k1/4 watt resistor
R11120k120k1/4 watt resistor 68k-180k Affects mid frequency. Lower value = lower frequency.
R12100k100k1/4 watt resistor 4.7k-33k Affects output volume. Smaller = more volume. May cause clipping
R131k1k1/4 watt resistor 470R-3.3k Affects gain and bass in 2ndstage. Smaller = brighter and gainier.
R141k1k1/4 watt resistor
R15100R1001/4 watt resistor
R162.2k2.2k1/4 watt resistor
R1710k10k1/4 watt resistor
R182.2k2.2k1/4 watt resistor
R19100k100k1/4 watt resistor 12k-220k Affects output volume. Bigger = more volume. May cause clipping
R2012k12k1/4 watt resistor
R2110R101/4 watt resistor
Capacitors 21
C12.2u2.2uelectrolytic cap 1u-4.7u Forms HPF with R13. Bigger = more bass/mud.
C20.1u100nMLCC
C32.2n2.2nfilm cap 1n-4.7n Forms input LPF with R1. Bbigger = mud, smaller = possible RF.
C422n22nfilm cap
C5100u100uelectrolytic cap 47u-220u power filtercap
C6100u100uelectrolytic cap 47u-220u power filtercap
C710u10uelectrolytic cap 4.7u-22u Forms HPF with R16. Bigger = more bass/mud.
C81n1nMLCC 680p-2.2n Smooths highfrequencies related to clipping of ssecond stage.
C947n47nfilm cap
C1027n27nfilm cap
C11300p300pMLCC
C120.22u220nfilm cap
C131n1nfilm cap 470p-2.2n Switchable system LPF
C14270p270pfilm cap 100p-470p System LPF
C151.5u1.5ufilm cap 1u-2.2u Forms HPF with R15 and Response. Bigger = more mud.
C160.1u100nfilm cap
C171u1ufilm cap
C181u1ufilm cap
C19120p120pMLCC 47p-470p Smooths highfrequencies related to clipping of first stage.
C20470p470pMLCC
C21270p270pMLCC
Diodes 5
D2YellowYELLOW3mm LED
D31n41481N4148Si diode
D41n41481N4148Si diode
D61n34a1N34AGe diode
D71n58181N5818Scottky diode 1n5817, 1n4001 Any suitablepolarity protection diode
ICs 2
IC1MC1458MC1458dual op amp TL072, TLC2272, LM833 Pin compatible dual op amp
IC2TL072TL072dual op amp TLC2272, NE5532, OPA2132 Pin compatible dual op amp
Potentiometers 4
DISTORTIONB10kB10kDUALGANG 16mm pot
RESPONSEC1kC1k16mm pot
LOUDNESSB1MB1M16mm pot
LEVELA100kA100k16mm pot
Switches 4
CLIPSPDT.PINSSPDT.PINSon/off/on 3 position switch!
MIDDPDT.PINSDPDT.PINSon/on 2 position switch!
DARKSPDT.PINSSPDT.PINSon/on 2 position switch!
SPADPADsend to PCB
LEDs 3
LEDL1L1LED
L+PADPADLED+
L-PADPADLED-
Other 3
RPADPADreturn from PCB
VPADPAD9V input
GPADPADground