Crossover
About the Crossover PCB
Crossover is an open source PCB design by nict41, published on GitHub. It is a 4-layer board measuring 149.6 × 63.5 mm, with 86 components from 26 distinct parts.
Other key parts include the MC33079. By type, the board carries 40 resistors, 19 capacitors, 6 connectors, 4 diodes, 3 ICs and 3 transistors.
From the project
An EasyEDA-importable schematic for the 3-way state variable electronic crossover from Elliott Sound Products Project 148 (), redrawn from Figure 2.
An EasyEDA-importable schematic for the 3-way state variable electronic crossover from Elliott Sound Products Project 148 (), redrawn from Figure 2.
Two cascaded 2nd-order state variable filters, 12 dB/octave, with continuously variable crossover frequencies and adjustable Q. One channel — build two for stereo.
Four variants are provided. They are the same circuit — identical filter topology and identical signal connectivity, which the generator asserts on every build — differing in the components that set the frequency range, in whether the eight op-amp sections are packaged as four duals…
Main components on the Crossover
Crossover bill of materials (BOM)
86 components, 26 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | MC33079 | SOIC-14 | U1, U2, U3 |
| 3 | MMBFJ112 | SOT-23 | Q1, Q2, Q3 |
| 1 | TB-3P-3.5 | TB-3P-3.5 | J1 |
| 4 | TB-2P-3.5 | TB-2P-3.5 | J2, J3, J4, J5 |
| 1 | MUTE | HDR-1X4 | J6 |
| 3 | DPDT LOCK | SW-PS22E05 | SW1, SW2, SW3 |
| 1 | TP1 | THT-PAD | TP1 |
| 1 | TP2 | THT-PAD | TP2 |
| 2 | 20k dual | POT-9MM-DUAL | VR1, VR2 |
| 3 | 10k log | POT-9MM-SINGLE | VR3, VR4, VR5 |
| 1 | 50k log | POT-9MM-SINGLE | VR6 |
| 4 | 1N4148W | SOD-123 | D1, D2, D3, D4 |
| 7 | 10UF 10uF | CASE-D5xL5.4 | C0, C11, C12, C13, C14, C15, C16 |
| 2 | 33NF 33nF | 1210 | C1, C2 |
| 4 | 33nF | 1210 | C3A, C3B, C4A, C4B |
| 6 | 100NF 100nF | 0805 | C5, C6, C7, C8, C9, C10 |
| 1 | 47K 47k | 0805 | R1 |
| 10 | 5.6K 5.6k | 0805 | R2, R4, R5, R6, R12, R14, R15, R16 +2 |
| 2 | 11K 11k | 0805 | R3, R13 |
| 2 | 4.7K 4.7k | 0805 | R7, R8 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | 100R | 0805 | R9, R19, R22, R25, R26, R27 |
| 7 | 10K 10k | 0805 | R10, R11, R23, R24, R31, R32, R33 |
| 2 | 13K 13k | 0805 | R17, R18 |
| 3 | 100K 100k | 0805 | R28, R29, R30 |
| 4 | 1M | 0805 | R34, R35, R36, R40 |
| 3 | 2.2K 2.2k | 0805 | R37, R38, R39 |
Crossover design files
The KiCad project lives in the nict41/crossover repository on GitHub; these links point at the commit this page was built from.
Crossover: common questions
How big is the Crossover PCB?
The Crossover measures 149.6 × 63.5 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Crossover?
86 components, from 26 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 Crossover design files?
From the nict41/crossover 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 Crossover design in my own project?
The repository has no license, so all rights stay with nict41. Use it as a reference, and ask the author before reusing the design.