Front-Stage-3-Channel-AB
About the Front-Stage-3-Channel-AB PCB
Front-Stage-3-Channel-AB is an open source PCB design by bunny-assassin, published on GitHub. It is a 4-layer board measuring 240 × 160 mm, with 318 components from 65 distinct parts.
Other key parts include the INA1651IPW, OPA1642, LM339, LM317TG and LM337TG. By type, the board carries 143 resistors, 84 capacitors, 48 transistors, 12 ICs, 12 diodes and 10 connectors.
It belongs with the audio designs in this gallery.
From the project
Front Stage 3 Channel A/B
A per-side, three-channel discrete Class-AB car amplifier designed for a fully active three-way front stage. Two identical units are built: one for the left stage, one for the right, so left and right share no power supply, no ground return and no chassis.
Design priority: sound quality above cost, size, efficiency and feature count.
Simulated, on the netlist generated from the design source of truth: 0.0013 % THD at 1 kHz / 52 W into 4 Ω, 0.0245 % at 20 kHz, 88.7° worst-case phase margin, zero step overshoot into any resistive load. Full tables and the caveats that go with them are in…
Main components on the Front-Stage-3-Channel-AB
Front-Stage-3-Channel-AB bill of materials (BOM)
318 components, 65 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | INA1651IPW | TSSOP-14_4.4x5mm_P0.65mm | U101, U201, U301 |
| 3 | OPA1642 | SOIC-8_3.9x4.9mm_P1.27mm | U102, U202, U302 |
| 2 | LM339 | SOIC-14_3.9x8.7mm_P1.27mm | U401, U402 |
| 2 | LM317TG | TO-220-3_Vertical | U403, U405 |
| 2 | LM337TG | TO-220-3_Vertical | U404, U406 |
| 3 | BCM857BS | SOT-363_SC-70-6 | Q101A, Q201A, Q301A |
| 3 | BC857C | SOT-23 | Q102, Q202, Q302 |
| 3 | BCM847BS | SOT-363_SC-70-6 | Q103A, Q203A, Q303A |
| 3 | BC847C | SOT-23 | Q104, Q204, Q304 |
| 6 | TTC004B | TO-126N_Vertical_HeatsinkWall | Q105, Q108, Q205, Q208, Q305, Q308 |
| 6 | TTA004B | TO-126N_Vertical_HeatsinkWall | Q106, Q109, Q206, Q209, Q306, Q309 |
| 9 | NJW0281G | TO-3P_Vertical_HeatsinkWall | Q107, Q112, Q113, Q207, Q212, Q213, Q307, Q312 +1 |
| 3 | MJE15032 | TO-220-3_Vertical_HeatsinkWall | Q110, Q210, Q310 |
| 3 | MJE15033 | TO-220-3_Vertical_HeatsinkWall | Q111, Q211, Q311 |
| 6 | NJW0302G | TO-3P_Vertical_HeatsinkWall | Q114, Q115, Q214, Q215, Q314, Q315 |
| 3 | BSS138 | SOT-23 | Q116, Q216, Q316 |
| 3 | TB003-500-02BE | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J401, J402, J403 |
| 3 | TB006-508-02BE | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J404, J405, J406 |
| 1 | TB007-762-03BE | TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J407 |
| 1 | REMOTE | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J408 |
Show 45 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SHUTDOWN | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J409 |
| 1 | AUX | Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J410 |
| 3 | 10k | Potentiometer_Bourns_3296W_Vertical | RV101, RV201, RV301 |
| 3 | 100R | Potentiometer_Bourns_3296W_Vertical | RV102, RV202, RV302 |
| 6 | LED_RED | R_0805_2012Metric | D101, D102, D201, D202, D301, D302 |
| 3 | BZX84C5V1 | SOT-23 | D103, D203, D303 |
| 1 | LED_GN | LED_D3.0mm | D401 |
| 1 | LED_AM | LED_D3.0mm | D402 |
| 1 | LED_RD | LED_D3.0mm | D403 |
| 3 | 2u2 | L_AirCore_12mm | L101, L201, L301 |
| 3 | 1u | C_0805_2012Metric | C101, C201, C301 |
| 30 | 100n | C_0805_2012Metric | C102, C104, C108, C111, C112, C116, C117, C118 +22 |
| 6 | 10u | C_0805_2012Metric | C103, C105, C203, C205, C303, C305 |
| 3 | 0R link | R_0805_2012Metric | C106, C206, C306 |
| 3 | 220p | C_0805_2012Metric | C107, C207, C307 |
| 3 | 68p | C_0805_2012Metric | C109, C209, C309 |
| 3 | 1n | C_0805_2012Metric | C110, C210, C310 |
| 9 | 100n/100V | C_Film_5mm_P5.00mm | C113, C121, C122, C213, C221, C222, C313, C321 +1 |
| 3 | 10p | C_0805_2012Metric | C114, C214, C314 |
| 3 | 2u2 | C_Film_10mm_P15.00mm | C115, C215, C315 |
| 6 | 220u/35V | CP_Radial_D10.0mm_P5.00mm | C119, C120, C219, C220, C319, C320 |
| 8 | 10u/50V | C_0805_2012Metric | C123, C124, C223, C224, C323, C324, C405, C406 |
| 2 | 4700u/35V | CP_Radial_D18.0mm_P7.50mm | C401, C402 |
| 2 | 220u/63V | CP_Radial_D10.0mm_P5.00mm | C403, C404 |
| 15 | 100R | R_0805_2012Metric | R101, R102, R105, R115, R118, R201, R202, R205 +7 |
| 3 | 2k2 | R_0805_2012Metric | R103, R203, R303 |
| 12 | 100k | R_0805_2012Metric | R104, R143, R146, R147, R204, R243, R246, R247 +4 |
| 15 | 1k | R_0805_2012Metric | R106, R116, R122, R145, R149, R206, R216, R222 +7 |
| 3 | 1M | R_0805_2012Metric | R107, R207, R307 |
| 6 | 220R | R_0805_2012Metric | R108, R109, R208, R209, R308, R309 |
| 3 | 287R | R_0805_2012Metric | R110, R210, R310 |
| 6 | 15k | R_0805_2012Metric | R111, R120, R211, R220, R311, R320 |
| 6 | 68R | R_0805_2012Metric | R112, R113, R212, R213, R312, R313 |
| 9 | 10k | R_0805_2012Metric | R114, R148, R150, R214, R248, R250, R314, R348 +1 |
| 6 | 115R | R_0805_2012Metric | R119, R138, R219, R238, R319, R338 |
| 3 | 4k42 | R_0805_2012Metric | R121, R221, R321 |
| 9 | 2k2 | R_1206_3216Metric | R123, R124, R137, R223, R224, R237, R323, R324 +1 |
| 6 | 220R | R_1206_3216Metric | R125, R126, R225, R226, R325, R326 |
| 12 | 4R7 | R_1206_3216Metric | R127, R128, R129, R130, R227, R228, R229, R230 +4 |
| 12 | 0R22 | R_TO220-2_PWR221T | R131, R132, R133, R134, R231, R232, R233, R234 +4 |
| 6 | 10R | R_TO220-2_PWR221T | R135, R136, R235, R236, R335, R336 |
| 3 | 470k | R_0805_2012Metric | R144, R244, R344 |
| 4 | 240R | R_0805_2012Metric | R401, R403, R405, R407 |
| 2 | 5k62 | R_0805_2012Metric | R402, R404 |
| 2 | 2k67 | R_0805_2012Metric | R406, R408 |
Front-Stage-3-Channel-AB design files
The KiCad project lives in the bunny-assassin/Front-Stage-3-Channel-AB repository on GitHub; these links point at the commit this page was built from.
- Layoutfs3w-amp/fs3w-amp.kicad_pcb
- Schematicfs3w-amp/fs3w-amp.kicad_sch
Front-Stage-3-Channel-AB: common questions
How big is the Front-Stage-3-Channel-AB PCB?
The Front-Stage-3-Channel-AB measures 240 × 160 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Front-Stage-3-Channel-AB?
318 components, from 65 distinct parts. The full bill of materials is listed on this page.
Where can I download the Front-Stage-3-Channel-AB design files?
From the bunny-assassin/Front-Stage-3-Channel-AB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Front-Stage-3-Channel-AB design in my own project?
The repository has no license, so all rights stay with bunny-assassin. Use it as a reference, and ask the author before reusing the design.
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