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Eurorack Buffered Multiple/Attenuator

Eurorack Modular Buffer Multiple Attenuator Utility Easy-Build Through-Hole

This module is part of my Eurorack series. It is a simple utility module that makes two copies of one input signal.

The PCBs are available in my store

Key features
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  • dual buffered multiple
  • attenuator
  • input can range from -12V to +12V
  • easy to build, all through hole components
  • 6HP

How it works
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The input voltage is buffered and copied to both outputs. This is great for having multiple copies of one control voltage which are not interfering each other, e.g. to use it in multiple oscillators or filters. The output can be attenuated and can also be used for audio signals.

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
J1CONN1Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical5-pin socket 2.54mm1
J2CONN2Connector_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, R210RResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor2
R3-R6100RResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1/4W 1% resistor4
U1TL074Package_DIP:DIP-14_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
J3, J4OUT1Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets2
J5, J6OUT2Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesThonkiconn 3.5mm jack sockets2
J7CONN1Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical5-pin header 2.54mm1
J8CONN2Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical5-pin header 2.54mm1
RV1LEVEL1Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Verticallinear, vertical, threaded, 6mm1
RV2LEVEL2Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Verticallinear, vertical, threaded, 6mm1

Schematics
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