Minimax8085-keypad vfd
About the Minimax8085-keypad vfd PCB
Minimax8085-keypad vfd is an open source PCB design by skiselev, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 80 mm, with 35 components from 29 distinct parts.
Other key parts include the 74C923, 74HC138 and 74HC32. By type, the board carries 20 switches, 6 capacitors, 3 ICs and 2 connectors.
It belongs with the displays & leds designs in this gallery.
From the project
VFD and keypad extension board for the minimax 8085
The Keypad and VFD extension board provides simple 20-key keypad and display for MiniMax8085 SBC. It is designed to be plugged on the top of MiniMax8085 using 2x20 pin header / pin socket.
The Keypad and VFD extension board uses 74HCT138 3-to-8 decoder and 74HCT32 quad 2-input OR gate ICs for address decode: Enable signal G1 of 74HCT138 is connected to IO/M signal, and therefore the decoder is enabled only during I/O operations, when IO/M signal value is HIGH Enable signals /G2A and /G2B of 74HCT138 are connected to address lines A6 and A7, so that decoder is enabled when both of these…
Main components on the Minimax8085-keypad vfd
Minimax8085-keypad vfd bill of materials (BOM)
35 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74C923 | IC_DIP20_300 | U1 |
| 1 | 74HC138 | IC_DIP16_300 | U2 |
| 1 | 74HC32 | IC_DIP14_300 | U3 |
| 1 | EXTENSION | Conn_Pin_Header_20x2_2.54mm | P1 |
| 1 | VFD | Conn_Pin_Header_7x2_2.54mm | P2 |
| 4 | HOLE | Hole_3mm | HOLE1, HOLE2, HOLE3, HOLE4 |
| 1 | 0 | Switch_Tactile_12mm | SW1 |
| 1 | 1 | Switch_Tactile_12mm | SW2 |
| 1 | 2 | Switch_Tactile_12mm | SW3 |
| 1 | 3 | Switch_Tactile_12mm | SW4 |
| 1 | 4 | Switch_Tactile_12mm | SW5 |
| 1 | 5 | Switch_Tactile_12mm | SW6 |
| 1 | 6 | Switch_Tactile_12mm | SW7 |
| 1 | 7 | Switch_Tactile_12mm | SW8 |
| 1 | 8 | Switch_Tactile_12mm | SW9 |
| 1 | 9 | Switch_Tactile_12mm | SW10 |
| 1 | A | Switch_Tactile_12mm | SW11 |
| 1 | B | Switch_Tactile_12mm | SW12 |
| 1 | C | Switch_Tactile_12mm | SW13 |
| 1 | D | Switch_Tactile_12mm | SW14 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | E | Switch_Tactile_12mm | SW15 |
| 1 | F | Switch_Tactile_12mm | SW16 |
| 1 | Control_0 | Switch_Tactile_12mm | SW17 |
| 1 | Control_1 | Switch_Tactile_12mm | SW18 |
| 1 | Control_2 | Switch_Tactile_12mm | SW19 |
| 1 | Control_3 | Switch_Tactile_12mm | SW20 |
| 4 | 0.1uF | Cap_Cer_508 | C1, C2, C3, C4 |
| 1 | 1uF | Cap_Pol_508_3 | C5 |
| 1 | 10uF | Cap_Pol_508_3 | C6 |
Minimax8085-keypad vfd design files
The KiCad project lives in the skiselev/minimax8085-keypad-vfd repository on GitHub; these links point at the commit this page was built from.
Minimax8085-keypad vfd: common questions
How big is the Minimax8085-keypad vfd PCB?
The Minimax8085-keypad vfd measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Minimax8085-keypad vfd?
35 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the Minimax8085-keypad vfd design files?
From the skiselev/minimax8085-keypad-vfd repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Minimax8085-keypad vfd design in my own project?
Yes, under the terms of its GPL-3.0 license, which skiselev chose for the repository.
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