Snubby
About the Snubby PCB
Snubby is an open source PCB design by Broosky, published on GitHub. It is a board, with 59 components from 15 distinct parts.
By type, the board carries 31 resistors, 15 transistors, 9 diodes and 4 connectors.
From the project
An overvoltage detection subsystem for Patchworks using discrete components.
Snubby is a subsystem of Patchworks that I designed and built to detect overvoltage conditions on supply rails using independent, fully discrete comparator circuits.
The circuit operates in either latching (with hysteresis) or non-latching mode. Red and green LEDs indicate fault status, and a buffered output can drive a load or interface with an MCU or other circuitry.
Snubby bill of materials (BOM)
59 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 9 | 2N3904 | TO-92_Inline | Q1, Q4, Q5, Q8, Q9, Q12, Q13, Q14 +1 |
| 6 | 2N3906 | TO-92_Inline | Q2, Q3, Q6, Q7, Q10, Q11 |
| 1 | VCC 12V (VCC Rail Input) | J1 | |
| 1 | 5V Rail Input | J2 | |
| 1 | 3V3 Rail Input | J3 | |
| 1 | Rail Overvoltage Active Low | J4 | |
| 1 | 12V | D1 | |
| 3 | Red | D2, D5, D8 | |
| 3 | Green | D3, D6, D9 | |
| 1 | 5V1 | D4 | |
| 1 | 3V3 | D7 | |
| 1 | 750R | R1 | |
| 19 | 10K | R2, R3, R4, R5, R7, R10, R12, R13 +11 | |
| 3 | 5K6 | R6, R16, R25 | |
| 8 | 2K2 | R8, R9, R11, R18, R19, R21, R28, R29 |
Snubby design files
The KiCad project lives in the Broosky/Snubby repository on GitHub; these links point at the commit this page was built from.
- SchematicKiCad/Rev A/Snubby.kicad_sch
Snubby: common questions
How many components are on the Snubby?
59 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Snubby design files?
From the Broosky/Snubby repository on GitHub, which has the schematic; the links under Design files point to each one.
Can I use the Snubby design in my own project?
The repository has no license, so all rights stay with Broosky. Use it as a reference, and ask the author before reusing the design.