DigitalTimer
About the DigitalTimer PCB
DigitalTimer is an open source PCB design by Bican-Valeriu-Cristian, published on GitHub under the MIT license. It is a 2-layer board measuring 82 × 84 mm, with 35 components from 17 distinct parts.
Other key parts include the L7805, 74LS73, 74LS08, 4071 and HDSP-7403. By type, the board carries 14 resistors, 11 ICs, 4 capacitors, 2 switches and 1 connector.
It belongs with the displays & leds designs in this gallery.
From the project
The project involves a digital timer that counts up to one minute. Each counter's 4-bit output is fed into a binary-to-7-segment decoder, enabling number display on 7-segment displays. The circuit includes switches for starting/stopping the timer and resetting the count.
The project involves a digital timer that counts up to one minute. Each counter's 4-bit output is fed into a binary-to-7-segment decoder, enabling number display on 7-segment displays. The circuit includes switches for starting/stopping the timer and resetting the count.
This circuit diagram represents a digital timer capable of counting seconds up to one minute. The circuit operates by generating a clock signal with a precise frequency of 1 Hz (once per second) using an oscillator based on the NE555 timer. This signal is connected to the count-up input of an integrated circuit counter.…
Main components on the DigitalTimer
DigitalTimer bill of materials (BOM)
35 components, 17 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | L7805 | TO-220-3_Vertical | U1 |
| 1 | 74LS73 | DIP-14_W7.62mm | U2 |
| 1 | 74LS08 | DIP-14_W7.62mm | U3 |
| 1 | 4071 | DIP-14_W7.62mm | U4 |
| 2 | HDSP-7403 | HDSP-7401 | U5, U11 |
| 2 | 4511 | DIP-16_W7.62mm | U6, U10 |
| 2 | 74LS193 | DIP-16_W7.62mm | U7, U8 |
| 1 | NE555D | DIP-8_W7.62mm | U9 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Altech_AK300-2_P5.00mm | J1 |
| 1 | 1k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | 1K |
| 1 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | 10K |
| 1 | 300 | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | 300 |
| 2 | SW_Push | SW_PUSH_6mm | SW1, SW2 |
| 2 | 100n | C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2 |
| 1 | 10n | C_Rect_L7.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 47u | C_Radial_D5.0mm_H11.0mm_P2.00mm | C4 |
| 14 | 300R | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 +6 |
DigitalTimer design files
The KiCad project lives in the Bican-Valeriu-Cristian/DigitalTimer repository on GitHub; these links point at the commit this page was built from.
- LayoutPCB.kicad_pcb
- SchematicPCB.kicad_sch
DigitalTimer: common questions
How big is the DigitalTimer PCB?
The DigitalTimer measures 82 × 84 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DigitalTimer?
35 components, from 17 distinct parts. The full bill of materials is listed on this page.
Where can I download the DigitalTimer design files?
From the Bican-Valeriu-Cristian/DigitalTimer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the DigitalTimer design in my own project?
Yes, under the terms of its MIT license, which Bican-Valeriu-Cristian chose for the repository.
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