20 Input AND Gate
author: SyncChannelBlog
2 layer board of 2.50 x 2.20 inches (63.5 x 55.9 mm)
Uploaded:
September 16, 2017
Shared:
September 16, 2017
Total Price:
$27.50
What to do when you have a partial reel of 74AHCT08 chips burning a hole in your pocket? Design a 20 Input AND gate of course.
Yes, this actually works. There are 10k pulldowns on all inputs so that they won’t pick up on noise. Apply logic high signals to all inputs to test it.
I made this board just for fun. Perhaps it would make for a good SMD soldering challenge… I gave one to a Digital Electronics professor who was retiring and he loved it.
BOM
- U1-U5: 74AHCT08 SOIC-14 (or similar logic family)
- U6: 74LVC2G17 SOT-23-6
- D1: B340A Schottky Diode SMA
- PWR LED: 0805 SMD (color of your choice)
- HIGH and LOW LEDs: 1206 SMD (colors of your choice)
- R1-R3: 330 ohm 0603
- Pulldown resistors (back side): 20x 10k ohm 0603
- C1-C6: 100 nF 0603
- C7: 10 uF 1206 SMD 10V (or substitute with ceramic cap)
- 2 Pin Headers: 1x2 0.1" standard header pins
- 40 pin Header: 2x20 0.1" standard header pins
Eagle Files
What to do when you have a partial reel of 74AHCT08 chips burning a hole in your pocket? Design a 20 Input AND gate of course.
Yes, this actually works. There are 10k pulldowns on all inputs so that they won’t pick up on noise. Apply logic high signals to all inputs to test it.
I made this board just for fun. Perhaps it would make for a good SMD soldering challenge… I gave one to a Digital Electronics professor who was retiring and he loved it.
BOM
- U1-U5: 74AHCT08 SOIC-14 (or similar logic family)
- U6: 74LVC2G17 SOT-23-6
- D1: B340A Schottky Diode SMA
- PWR LED: 0805 SMD (color of your choice)
- HIGH and LOW LEDs: 1206 SMD (colors of your choice)
- R1-R3: 330 ohm 0603
- Pulldown resistors (back side): 20x 10k ohm 0603
- C1-C6: 100 nF 0603
- C7: 10 uF 1206 SMD 10V (or substitute with ceramic cap)
- 2 Pin Headers: 1x2 0.1" standard header pins
- 40 pin Header: 2x20 0.1" standard header pins
