2 layers177 × 119.4 mm
Strobe torch panelized
PublicDomainProject/strobe-torch
Little flashlight (or torch in UK) to generate 50, 60 and 300 Hz strobe light to calibrate turntables with a strobe discs
300 parts
2 layers33.4 × 59.3 mm
Strobe torch
PublicDomainProject/strobe-torchLittle flashlight (or torch in UK) to generate 50, 60 and 300 Hz strobe light to calibrate turntables with a strobe discs
- Size
- 33.4 × 59.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 14
- Pads
- 64
- Tracks, vias
- 156, 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 28 Feb 2018
- Updated
- 9 Feb 2025
Overview
Strobe torch is an open-source printed circuit board by PublicDomainProject, from the PublicDomainProject/strobe-torch repository on GitHub. It is a 2-layer board of 33.4 × 59.3 mm with 30 parts on 14 nets, routed with 156 tracks and 2 vias.
It is built around the ATTINY25V-10SU, BAT54A and BSS138. Its parts include 5 diodes, 3 capacitors, 3 switches, 2 resistors and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY25V-10SU
SOIC-8-208mil-40℃~+85℃ 1.8V~5.5V 10MHz 10bit 128Byte 128Byte 2KB 6 8 Bit AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BAT54A
SOT-231 Pair Common Anode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky DiodesBSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
README
README.mdStrobe Torch
Purpose
Little flashlight (or torch in UK) to calibrate the speed of a turntable with the help of a strobe disc or the strobe rings along the platter.
To use such strobe discs one needs a light source with a 50, 60 or 300 Hz strobe light. In the older days a simple light bulb with filament was enough to did the job. In the time of LEDs and compact fluorescent light sources one needs an additional helper like this to work with a strobe disc.
The needed frequency depends on your strobe disc. Most of them have at least 50 and 60 Hz in parallel (or two sides). There are "high-resolution" strobe discs that need a 300 Hz light source for calibration.
Also because this strobe torch uses a crystal oscillator it is more precise than a light bulb.
Usage
The device is designed to be very simple to use.
There are three momentary buttons on the front. Each button represents one frequency. So simply press the 50 Hz button and you get a white light beam that flickers with 50 Hz.
When you release the button, the light goes off and the device consumes no energy.
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 20pF | Capacitors_SMD:C_0603 | C2, C3 |
| 2 | BAT54A | TO_SOT_Packages_SMD:SOT-23 | D4, D5 |
| 2 | White Sideemitting | LEDs_Side_Emitting:LED_215 | D1, D2 |
| 1 | 100n | Capacitors_SMD:C_0805 | C1 |
| 1 | 150 | Resistors_SMD:R_0603 | R2 |
| 1 | 1k8 | Resistors_SMD:R_0603 | R1 |
| 1 | 300Hz | Button:SW_SPST_FSM6JSMA | SW2 |
| 1 | 300Hz | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP4 |
| 1 | 4.9152MHz | Crystals:Crystal_SMD_HC49-SD | Y1 |
| 1 | 50Hz | Button:SW_SPST_FSM6JSMA | SW1 |
| 1 | 50Hz | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP3 |
| 1 | 60Hz | Button:SW_SPST_FSM6JSMA | SW3 |
| 1 | 60Hz | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP5 |
| 1 | ATTINY25V-10SU | Housings_SOIC:SO-8_5.3x6.2mm_Pitch1.27mm | U1 |
| 1 | BSS138 | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | Bat+ | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP1 |
| 1 | Bat- | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP2 |
| 1 | Battery | Battery_Holder:Teko_1112x_battery_compartment | BT1 |
| 1 | Clki | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP8 |
| 1 | Clko | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP9 |
| 1 | GND | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP7 |
| 1 | Green InGaN | LEDs:LED_0603 | D3 |
| 1 | LED1 | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP12 |
| 1 | LED2 | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP11 |
| 1 | PWMout | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP13 |
| 1 | Udrain | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP10 |
| 1 | VCC | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | TP6 |
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Questions
How big is the Strobe torch PCB?
It measures 33.4 × 59.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Strobe torch use?
30 parts, built around the ATTINY25V-10SU, BAT54A and BSS138. 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 Strobe torch KiCad files?
From the PublicDomainProject/strobe-torch repository on GitHub, at the commit this page was made from: the board is cad/strobe-torch.kicad_pcb and its schematic cad/strobe-torch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Strobe torch design in my own project?
Its repository states no licence, so its author keeps all rights: ask PublicDomainProject before reusing the design.