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Summing mixer

pythagorean-comma·summing-mixer·summing-mixer/summing-mixer.kicad_pcb

Summing mixer PCB layout, top view — open source board by pythagorean-comma

About the Summing mixer PCB

Summing mixer is an open source PCB design by pythagorean-comma, published on GitHub. It is a 4-layer board measuring 122.8 × 50.4 mm, with 59 components from 27 distinct parts.

Other key parts include the OPA1612AID, LM317MDCYR and ICL7660SCBAZ. By type, the board carries 22 resistors, 19 capacitors, 6 connectors, 3 ICs and 3 diodes.

It belongs with the audio designs in this gallery.

From the project

A six-channel active summing mixer in a pedal enclosure: three TRS inputs from a Cycfi Nexus-GK, one mono 1/4" output, generated from source rather than drawn by hand.

A six-channel active summing mixer in a pedal enclosure: three TRS inputs from a Cycfi Nexus-GK, one mono 1/4" output, generated from source rather than drawn by hand.

The Nexus has no mono sum — twelve channels on six TRS jacks, MIDI, and a 13-pin Roland DIN, with the GK module's MIX SW explicitly excluded. This fills that gap for the six Cycfi Nu capsules on a viola da gamba whose piezo side is rmc-pizz-arco and whose Nu wiring is cycfi-nu-hub.

Main components on the Summing mixer

OPA1612AIDLM317MDCYRICL7660SCBAZ

Summing mixer bill of materials (BOM)

59 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
OPA1612AID
OPA1612
U1
1
LM317MDCYR
LM317
U2
1
ICL7660SCBAZ
ICL7660S
U3
1
61300311121
OUT
J7
1
61300211121
PWR
J8
1
61300411121
LEVEL
J9
1
61300511121
TO JACKS 1/2
J11
1
61300511121
TO JACKS 3/4
J13
1
61300511121
TO JACKS 5/6
J15
6
3299W-1-103LF
10k lin
RV101, RV201, RV301, RV401, RV501, RV601
1
B340A-13-F
B340A
D801
2
1N4148W-7-F
1N4148W
D802, D803
6
B32529C0105J000
1u/63V film
C101, C201, C301, C401, C501, C601
2
GRM3195C1H101JA01D
100p/50V C0G
C701, C702
1
B32529D0225J189
2u2/63V film
C703
1
UWT1V101MCL1GS
100u/35V
C801
3
GRM31MR71H104KA01L
100n/50V
C802, C809, C810
2
GRM31CR71C106KAC7L
10u/16V X7R
C803, C804
2
GRM32ER71E226KE15L
22u/25V X7R
C805, C806
2
PCJ1C101MCL1GS
100u/16V polymer <50mR
C807, C808
Show 7 more
QtyPartRefs
7
ERA8AEB103V
10k 0.1%
R101, R201, R301, R401, R501, R601, R701
8
RC1206JR-070RL
0R
R102, R202, R302, R402, R502, R602, R705, R901
2
ERA8AEB222V
2k2 0.1%
R702, R703
1
RC1206FR-07100RL
100R
R704
1
RC1206FR-07240RL
240R 1%
R801
1
RC1206FR-071K5L
1k5 1%
R802
2
RC1206FR-0710RL
10R
R803, R804

Summing mixer design files

The KiCad project lives in the pythagorean-comma/summing-mixer repository on GitHub; these links point at the commit this page was built from.

Summing mixer: common questions

How big is the Summing mixer PCB?

The Summing mixer measures 122.8 × 50.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Summing mixer?

59 components, from 27 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Summing mixer design files?

From the pythagorean-comma/summing-mixer repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Summing mixer design in my own project?

The repository has no license, so all rights stay with pythagorean-comma. Use it as a reference, and ask the author before reusing the design.

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