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Eurorack Mixer

Eurorack Modular Mixer Utility Easy-Build Through-Hole

This module is part of my Eurorack series. It is a simple mixer with four channels. There is an inverted output signal in addition to the not inverted one.

The PCBs are available in my store

Key features
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  • four channel mixer
  • for audio and CV
  • additional inverted output
  • easy to build, all through hole components
  • 6HP

How it works
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The four channels are summed up and can be attenuated individually. In addition to the normal output there is an inverted one. This makes it not only great as an output section for your modular but can also be used to mix control voltages.

Assembly
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The build is pretty straight forward. The module only consists of through-hole components and is easy to assemble. There are three boards: a front panel, a board for controls/jacks and a board for the circuit.

First, solder all parts on the component board. Keep the jacks and potentiometers for the end. Begin with the components with the lowest profile and work your way up. Screw the jacks and potentiometer to the front panel before soldering them. All components have a fixed designator and a component value printed on the board. Additional information on the parts can be found in the BOM below.

BOM
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Link to interactive BOM of the component board

ReferenceValueFootprintDescriptionQty
C1, C210uCapacitor_THT:CP_Radial_D5.0mm_P2.50mmelectrolytic2
C3100nCapacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mmceramic1
J7EXTConnector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Verticaladditional inputs, optional1
J8CONNConnector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical5-pin socket 2.54mm1
POWER1Conn_02x05_Odd_EvenConnector_IDC:IDC-Header_2x05_P2.54mm_VerticalIDC 10-pin1
R1, R210Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor2
R3-R5100kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor3
R10, R111kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor2
U1TL072Package_DIP:DIP-8_W7.62mm_Socket_LongPads1

Link to interactive BOM of the control board

ReferenceValueFootprintDescriptionQty
J1IN1Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J2IN2Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J3IN3Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J4IN4Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J5OUT_NEGConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J6OUTConnector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets1
J7CONNConnector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical5-pin header 2.54mm1
R1-R4100kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor4
RV1-RV4100kPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Verticallinear, vertical, threaded, 6mm4

Schematics
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