2 layers99.8 × 43.9 mm
2 layers82 × 32.4 mm
Counter
Hal9k-dk/lasersaurEverything related to the Lasersaur
- Size
- 82 × 32.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 20
- Pads
- 64
- Tracks, vias
- 117, 4
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 1 Jan 2022
- Updated
- 20 Oct 2026
Overview
Counter is an open-source printed circuit board by Hal9k-dk, from the Hal9k-dk/lasersaur repository on GitHub. It is a 2-layer board of 82 × 32.4 mm with 22 parts on 20 nets, routed with 117 tracks and 4 vias.
It is built around the 74HCT08D and MMBT3904. Its parts include 7 connectors, 6 resistors, 4 diodes, 2 capacitors and 1 IC.
Main components
2
74HCT08D
SOP-14-40℃~+125℃ 100mV、330mV 16ns@4.5V,15pF 2 2V 3.84V、4.4V 4 4.5V~5.5V 74HCT 800mV AND Gate TTL compatible CMOS SOP-14 Logic Gates ROHSMDDLogic Gates
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | Conn_01x01 | Connector_Pin:Pin_D1.0mm_L10.0mm | J1, J2, J3 |
| 2 | 1N4148 | Diode_SMD:D_MiniMELF | D1, D4 |
| 2 | 820 | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | LED | LED_THT:LED_D5.0mm_Horizontal_O1.27mm_Z3.0mm | D2, D3 |
| 1 | 0.2" | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J5 |
| 1 | 0.2" | TerminalBlock:TerminalBlock_bornier-6_P5.08mm | J4 |
| 1 | 0.2" | TerminalBlock:TerminalBlock_Altech_AK300-3_P5.00mm | J7 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 100u | Capacitor_Tantalum_SMD:CP_EIA-7343-40_Kemet-Y | C2 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 74HCT08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | JST XH | Connector_JST:JST_XH_B05B-XH-A_1x05_P2.50mm_Vertical | J6 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | RELAY_DIL16 | custom:DIP-16_Relay | RLY1 |
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Questions
How big is the Counter PCB?
It measures 82 × 32.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Counter use?
22 parts, built around the 74HCT08D and MMBT3904. 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 Counter KiCad files?
From the Hal9k-dk/lasersaur repository on GitHub, at the commit this page was made from: the board is pcb/counter/counter.kicad_pcb and its schematic pcb/chillercontrol/chillercontrol.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Counter design in my own project?
Its repository states no licence, so its author keeps all rights: ask Hal9k-dk before reusing the design.