Open555
About the Open555 PCB
Open555 is an open source PCB design by cheyao, published on GitHub under the Zlib license. It is a 2-layer board measuring 92.6 × 46.8 mm, with 44 components from 12 distinct parts.
By type, the board carries 22 transistors, 15 resistors, 1 connector, 1 battery holder, 1 switch and 1 diode.
From the project
An 555 circuit entirely made out of THT transistors
Ever wondered how a 555 timer IC worked? Here you have it! A 555 IC, made entirely with THT transistors.
Made as a part of http://solder.hackclub.com/!
Open555 bill of materials (BOM)
44 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 11 | PNP | TO-92L_HandSolder | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q13 +3 |
| 11 | NPN | TO-92L_HandSolder | Q8, Q9, Q10, Q11, Q12, Q15, Q16, Q19 +3 |
| 1 | Conn_01x05_Pin | PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | Battery_Cell | BatteryHolder_Multicomp_BC-2001_1x2032 | BT1 |
| 2 | R_Potentiometer | Potentiometer_Runtron_RM-065_Vertical | RV1, RV2 |
| 1 | SW_Push | SW_PUSH_6mm | SW1 |
| 1 | LED | LED_D5.0mm | D1 |
| 1 | 10uF | CP_Radial_D8.0mm_P5.00mm | C3 |
| 10 | 4.7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R4, R5, R6, R10, R11, R12, R14 +2 |
| 3 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R7, R8 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 1 | 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R16 |
Open555 design files
The KiCad project lives in the cheyao/Open555 repository on GitHub; these links point at the commit this page was built from.
- Layoutsrc/Open555.kicad_pcb
- Schematicsrc/Open555.kicad_sch
Open555: common questions
How big is the Open555 PCB?
The Open555 measures 92.6 × 46.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Open555?
44 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the Open555 design files?
From the cheyao/Open555 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Open555 design in my own project?
Yes, under the terms of its Zlib license, which cheyao chose for the repository.