4 layers252 × 152 mm
CTA control board
PySpice-org/eda-rw
Python library to read/write KiCad and LibrePCB Sexpr file format
619 parts9
2 layers60 × 90 mm
Palemka
kardTaczka/easter_pcbFor soldering learning. 15 leds connected to breathing 555. Frequency around 0.2 Hz for smooth breathing-like behaviour.
- Size
- 60 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 86
- Nets
- 29
- Pads
- 180
- Tracks, vias
- 301, 152
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 May 2026
- Updated
- 27 May 2026
Overview
Palemka is an open-source printed circuit board by kardTaczka, from the kardTaczka/easter_pcb repository on GitHub. It is a 2-layer board of 60 × 90 mm with 86 parts on 29 nets, routed with 301 tracks and 152 vias.
It is built around the NE555P, SM5059 and BCP53, with the BCP56 among its other parts. Its parts include 37 capacitors, 19 resistors, 17 diodes, 2 transistors and 2 connectors.
Main components
4
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
SM5059
DO-213AB(MELF)DO-213AB(MELF) Diodes - General Purpose ROHSDIOTECDiodes - General Purpose
BCP53
SOT-223-65℃~+150℃ 1 PNP 100nA 145MHz 1A 500mV 5V 63 650mW 80V PNP SOT-223 Bipolar (BJT) ROHSNexperiaBipolar (BJT)BCP56
SOT-223-55℃~+150℃ 1 NPN 1.5W 100MHz 100nA 1A 250 500mV 5V 80V NPN SOT-223 Bipolar (BJT) ROHSHXY MOSFETBipolar (BJT)
README
README.mdEaster PCB
Quick view of PCB
Below are presented screenshots of 3d render PCB and schematic.
1. Front
2. Back
3. Schematic
About
Dual-Channel Alternating Output - The NE555 timer operates at approximately 0.2 Hz. Its square wave output is smoothed by an RC integration network consisting of a 10 kΩ resistor and a 50 µF capacitor bank (achieved by placing five 10 µF MLCCs in parallel). This analog signal drives a complementary transistor pair consisting of a BCP56 (NPN) and a BCP53 (PNP).
Instead of driving a single array, the load is split into two separate LED rails. Because the NPN and PNP transistors conduct on opposite voltage swings, they create an alternating "breathing" effect. When the capacitor charges, the NPN rail fades in while the PNP rail fades out. When the voltage drops, the cycle reverses. The peak forward current is hardware-limited to a safe and visually pleasing 3 mA per LED.
Parts
86| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30 +9 |
| 15 | 470 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19 |
| 15 | LED_r | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17 |
| 12 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C9, C10, C11, C12, C13, C14 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | LOGO | LOGO | G***, G***, G*** |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 2 | SM5059 | Diode_SMD:D_SMA | D1, D2 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 68k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | BCP53 | Package_TO_SOT_SMD:SOT-223 | Q2 |
| 1 | BCP56 | Package_TO_SOT_SMD:SOT-223 | Q1 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | NE555P | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | Thermistor_PTC | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | TH1 |
| 1 | USB_C_Receptacle_PowerOnly_6P | palemka:usb4970 | J2 |
Questions
How big is the Palemka PCB?
It measures 60 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Palemka use?
86 parts, built around the NE555P, SM5059, BCP53 and BCP56. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Palemka KiCad files?
From the kardTaczka/easter_pcb repository on GitHub, at the commit this page was made from: the board is palemka.kicad_pcb and its schematic palemka.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Palemka design in my own project?
Its repository states no licence, so its author keeps all rights: ask kardTaczka before reusing the design.
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