2 layers
2 layers45 × 42 mm
Attiny pwm
OE8HSR/Fancy-Dimmera pwm dimmer for Led Flatpanels
- Size
- 45 × 42 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 14
- Pads
- 78
- Tracks, vias
- 121, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Mar 2025
- Updated
- 21 Apr 2025
Overview
Attiny pwm is an open-source printed circuit board by OE8HSR, from the OE8HSR/Fancy-Dimmer repository on GitHub. It is a 2-layer board of 45 × 42 mm with 29 parts on 14 nets, routed with 121 tracks and 10 vias.
It is built around the ATTINY402-SSN and IRLZ44N. Its parts include 8 resistors, 3 capacitors, 3 diodes, 3 switches and 2 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2README
README.mdFancy-Dimmer
The Fancy-Dimmer is "designed" to dim LED Flatpanels.
(Flatpanels are used to make CallibrationFrames in Astrophotography)
Input: 12Vdc (10V-14,4V)
Output: 12V PWM
PWM-Frequency: 30kHz (Programable)
Imax: 5A
PWM-Resolution: 668 Counts
Potentiometer controlled
2 x "programable" Presets
Programable via UPDI
\
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10k | Resistor_SMD:R_0805_2012Metric | R4, R5, R6, R7 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
| 3 | SW_Push | Button_Switch_SMD:SW_SPST_B3SL-1002P | SW1, SW2, SW3 |
| 2 | 10µF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D1, D3 |
| 1 | 0 | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 2k2 | Resistor_SMD:R_0805_2012Metric | R8 |
| 1 | 560 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | ATtiny402-SS | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Battery | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | BT1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | D | Diode_SMD:D_0603_1608Metric | D2 |
| 1 | IRLZ44N | Package_TO_SOT_SMD:TO-263-3_TabPin2 | Q1 |
| 1 | LM2937xMP | Package_TO_SOT_SMD:TO-263-3_TabPin4 | U1 |
| 1 | LOGO | hmst:logo6 | G*** |
| 1 | R_Potentiometer | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-03P_1x03_P5.00mm | RV1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
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Questions
How big is the Attiny pwm PCB?
It measures 45 × 42 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Attiny pwm use?
29 parts, built around the ATTINY402-SSN and IRLZ44N. 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 Attiny pwm KiCad files?
From the OE8HSR/Fancy-Dimmer repository on GitHub, at the commit this page was made from: the board is attiny_pwm.kicad_pcb and its schematic attiny_pwm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Attiny pwm design in my own project?
Its repository states no licence, so its author keeps all rights: ask OE8HSR before reusing the design.