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U1 DS3231 SO-16W |
x 1 | |
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U2 Atmega88(168, 328) TQFP32 |
x 1 | |
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U3 КФ1211ЕУ1 SO-8 |
x 1 | |
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U4 IRF7313 SO-8 |
x 1 | |
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D3 Zener 5v1 miniMELF |
x 1 | |
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D4 BAW56 SOT-23 |
x 1 | |
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D5-D9 SK6805 |
x 5 | |
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Q1-Q12 BC857W SOT-323 |
x 12 | |
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R2 1k 0603 |
x 1 | |
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R3-R8, R15-R20, R28, R31 10k 0603 |
x 14 | |
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R9-R14, R21-R26 220k 0603 |
x 12 | |
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R27 10k 0805 |
x 1 | |
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C1 270p 0603 |
x 1 | |
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C2 1u 0603 |
x 1 | |
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C3, C6-C12 100n 0603 |
x 8 | |
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C4 10V 100u 5x11 |
x 1 | |
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C5 63v 10u 5x11 |
x 1 | |
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T1 10x6x4 Toroid N87 |
x 1 | |
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HL1, HL2, HL4, HL5 IV-6 |
x 4 | |
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HL3 IV-1 |
x 1 | |
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BT1 CR1220 holder |
x 1 | |
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key G71Y |
x 1 | |
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micro USB female |
x 1 |
VFD Tube Clock
I would like to present to the public the project of my watches on VLI. The IV-6 indicators are used to indicate the time, and the IV-1 is used for the dividing point. To obtain -40 volts DC and ~ 4 volts AC, a converter based on the KF1211EU1 microcircuit, power switches IRF7313 is used. The transformer has one primary winding with a midpoint, two secondary windings with a midpoint. In the primary winding 2 x 6 turns, in the secondary 2 x 50 turns and 2 x 4 turns, the material of the ferrite ring is N87, dimensions 10x6x4. To control the grids and segments of the indicators, the “bottom” BC857 keys in the SOT323 package are used. Real-time microcircuit - DS3231 in SO-16 package, microcontroller - Atmega328P in TQFP32 package. Installation is performed on two double-sided boards, boards are connected by a board-to-board connector. Also, under the indicators, an optional installation of SK6805 addressable LEDs is provided. The device operates on any 5 volt power supply unit that has a USB connector.
For the firmware of the microcontroller, the corresponding contacts are displayed. You can use Atmega88, Atmega168, Atmega328, the firmware takes about 8kb without LED backlighting. The firmware is written in C (avr-gcc), the code is available on GitHub
When ordering, you need to choose a thickness of 1mm or 1.2mm and a panel from pcbway.
!!!The circuit uses a rare microcircuit KF1211EU1 (made in Russia)!!!
VFD Tube Clock
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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