SoftStart
About the SoftStart PCB
SoftStart is an open source PCB design by profdc9, published on GitHub. It is a 2-layer board measuring 88 × 56 mm, with 33 components from 19 distinct parts.
By type, the board carries 13 connectors, 8 diodes, 7 resistors and 3 capacitors.
It belongs with the audio designs in this gallery.
From the project
Power Amplifier based on Michael Chua's C300 amplifier
This is a PCB layout by Daniel Marks based on Michael Chua's C300 amplifier which can be found at:
This is a project designed to be a good quality amplifier that is achieves good quality distortion (< 0.1% THD at 10 kHz and 300 W per channel max), and is both educational (to study for electronics engineering and hobbyist use) and archival (to be useful long into the future, or "future proofed"). This is a layout from 2020 but it is assumed that decades into the future, relatively few bipolar transistor models will be available as through-hole and discrete component electronics become ever…
SoftStart bill of materials (BOM)
33 components, 19 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LIVE | SpadeTerminal635 | J1 |
| 2 | NEUTRAL | SpadeTerminal635 | J2, J5 |
| 1 | SW1 | SpadeTerminal635 | J3 |
| 3 | SW2 | SpadeTerminal635 | J4, J18, J19 |
| 1 | SWOUTPUT | SpadeTerminal635 | J6 |
| 4 | LIVE | 1pin | J7, J8, J9, J10 |
| 1 | Conn_01x02 | TerminalBlock_bornier-2_P5.08mm | J11 |
| 2 | SPDTRelay | SMIHRelay | RLY1, RLY2 |
| 4 | 1N4007 | D_DO-41_SOD81_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 1 | 1N4749 | D_DO-41_SOD81_P7.62mm_Horizontal | D5 |
| 1 | LED | LED_D3.0mm | D6 |
| 2 | 1N4742 | D_DO-41_SOD81_P7.62mm_Horizontal | D7, D8 |
| 1 | 10 nF | C_Rect_L11.5mm_W4.5mm_P10.00mm_MKT | C1 |
| 1 | 1 uF | C_Rect_L24.0mm_W10.1mm_P22.50mm_MKT | C2 |
| 1 | 1000 uF | CP_Radial_D10.0mm_P5.00mm | C3 |
| 1 | 220R | R_Axial_Power_L20.0mm_W6.4mm_P22.40mm | R1 |
| 1 | 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 4 | 150R | R_Axial_Power_L20.0mm_W6.4mm_P22.40mm | R3, R4, R5, R6 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
SoftStart design files
The KiCad project lives in the profdc9/PowerAmpAudio repository on GitHub; these links point at the commit this page was built from.
SoftStart: common questions
How big is the SoftStart PCB?
The SoftStart measures 88 × 56 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the SoftStart?
33 components, from 19 distinct parts. The full bill of materials is listed on this page.
Where can I download the SoftStart design files?
From the profdc9/PowerAmpAudio repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the SoftStart design in my own project?
The repository has no license, so all rights stay with profdc9. Use it as a reference, and ask the author before reusing the design.
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