Small SMD based night clock with RTC and battery/supercap backup
Clock is an open-source printed circuit board by dunkelstern, from the dunkelstern/NightClock repository on GitHub, published under the BSD-3-Clause licence. It is a 2-layer board of 99 × 57.5 mm with 42 parts on 63 nets, routed with 585 tracks and 44 vias.
It is built around the ATTINY2313-20SU, BC848 and BC848C, with the BC858A among its other parts. Its parts include 16 resistors, 8 ICs, 4 capacitors, 3 diodes and 3 transistors. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 150 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R6, R7, R8, R9, R10, R11 |
| 4 | KCSC02-123 | Display_7Segment:7SegmentLED_LTS6760_LTS6780 | U1, U2, U3, U4 |
| 3 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R3, R5, R14 |
| 2 | 100nF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C3 |
| 2 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R2, R4 |
| 2 | 4.7k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R15, R16 |
| 2 | LED | LED_THT:LED_D3.0mm | D1, D2 |
| 1 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R13 |
| 1 | 120 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
| 1 | 160 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R12 |
| 1 | 1F | Capacitor_THT:CP_Radial_D14.0mm_P5.00mm | C4 |
| 1 | 4.7uF | Capacitor_SMD:CP_Elec_6.3x5.7 | C1 |
| 1 | 4543 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U5 |
| 1 | 74LS138 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | ATtiny2313-20SU | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U7 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical_SMD | J1 |
| 1 | BC848 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q5 |
| 1 | BC848C | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q6 |
| 1 | BC858A | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q7 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_1058_1x2032 | BT1 |
| 1 | D | Diode_SMD:D_SOD-123 | D3 |
| 1 | Inc | Button_Switch_THT:SW_PUSH_6mm_H13mm | SW1 |
| 1 | Prgm | Button_Switch_THT:SW_PUSH_6mm_H13mm | SW2 |
| 1 | RV-8564-C2 | RV-8564-C2:RV-8564-C2 | U8 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex-105017-0001 | J2 |
The 39 most common of 42 parts.
It measures 99 × 57.5 mm and has 2 copper layers, 1.6 mm thick.
42 parts, built around the ATTINY2313-20SU, BC848, BC848C and BC858A. 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.
From the dunkelstern/NightClock repository on GitHub, at the commit this page was made from: the board is Kicad/Clock.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the BSD-3-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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