Sequswit
About the Sequswit PCB
Sequswit is an open source PCB design by versusentropy, published on GitHub under the Custom license license. It is a 2-layer board measuring 20.1 × 100 mm, with 55 components from 25 distinct parts.
Other key parts include the 4022B and DG412xY. By type, the board carries 19 resistors, 12 diodes, 8 connectors, 6 capacitors, 5 transistors and 2 ICs.
From the project
seqswt 4(3,2) to 1 sequential switch
Known bug: Label 2 and 3 at the switch are reversed.
4hp +/-12V 10mA/1mA 1 PCB 2 layer common jack is connected to one output at a time DG412 Rail2Rail analog switch recommended step input move to next position TN pin header on pcb reset input move to step 1 * locked on step 1, while gate high.
Schematic and layout with KiCad 5. Panel with Inkscape + shenzen2svg → Kicad
Main components on the Sequswit
Sequswit bill of materials (BOM)
55 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 4022B | TSSOP-16_4.4x5mm_P0.65mm | U1 |
| 1 | DG412xY | SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 5 | MMBT3904 | SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 1 | 1 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J1 |
| 1 | 2 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J2 |
| 1 | 3 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J3 |
| 1 | 4 | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J4 |
| 1 | com | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J5 |
| 1 | rst | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J6 |
| 1 | stp | Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHolesSMALL | J7 |
| 1 | Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Vertical | J8 |
| 1 | 2 4 3 | SW_SPDT_2_5mm | SW1 |
| 6 | 1N4148W | D_SOD-123 | D1, D2, D3, D4, D5, D6 |
| 4 | LED | LED_D3.0mm | D7, D8, D9, D10 |
| 2 | 1N5819W | D_SOD-123 | D11, D12 |
| 2 | Ferrite_Bead_Small | L_0805_2012Metric | FB1, FB2 |
| 1 | 1u | C_0402_1005Metric | C1 |
| 3 | 100n | C_0402_1005Metric | C2, C3, C4 |
| 1 | 22u | C_0805_2012Metric | C5 |
| 1 | 10u | C_0805_2012Metric | C6 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 47k | R_0402_1005Metric | R1, R4, R8, R9 |
| 4 | 1k | R_1206_3216Metric | R2, R13, R14, R15 |
| 6 | 10k | R_0402_1005Metric | R3, R5, R6, R7, R11, R12 |
| 1 | 100k | R_0402_1005Metric | R10 |
| 4 | 1k | R_0603_1608Metric | R16, R17, R18, R19 |
Sequswit design files
The KiCad project lives in the versusentropy/seqswt repository on GitHub; these links point at the commit this page was built from.
- Layoutkicad/sequswit.kicad_pcb
Sequswit: common questions
How big is the Sequswit PCB?
The Sequswit measures 20.1 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Sequswit?
55 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the Sequswit design files?
From the versusentropy/seqswt repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Sequswit design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.