The Learning Circuit | element14 presents | Project Videos | VCP Biography: Karen
In the previous lesson, Karen explained the logic behind AND, NAND, OR, NOR, NOT, XOR, and XNOR logic gates. In that episode, we also learned that logic gates are typically contained in IC chips, with multiple gates within each chip. For this episode’s project, Karen has decided to throw out the ICs, and instead, use transistors to create each logic gate, further demonstrating how the logic of each gate type works. Follow along to continue the journey of understanding logic gates through the use of transistors. Solder along and you’ll end up with a tidy little project contained within a couple of Altoid tins! In the end, Karen dares you to try your hand at creating the more complicated XOR and XNOR gates out of transistors. Are you up to the challenge?
Bill of Materials
| Product Name | Manufacturer | Quantity | Buy KitBuy Kit |
|---|---|---|---|
| Prototype Board, 25 x 15 grid, 1.6 mm, 72 mm, 47 mm | Multicomp | 1 | Buy NowBuy Now |
| Prototype Board, Phenolic, 30 x 25 grid, 1.6 mm, 94 mm, 71 mm | Multicomp | 1 | Buy NowBuy Now |
| Transistor, BC547, NPN | Multicomp | 9 | Buy NowBuy Now |
| Hook Up Wire, Blue, 22 AWG, 25 ft, solid | NTE ELECTRONICS | 1 | Buy NowBuy Now |
| Resistor Set, 480pcs, 16 x E3 Series Values, 1/4W Through Hole (1kohm, (2) 10kohm) | Velleman | 1 | Buy NowBuy Now |
| Tactile Switch, 10mm, Blue, 24 VDC, 50mA, 2.54mm | NKK SWITCHES | 2 | Buy NowBuy Now |
| Slide Switch, SPDT, 2.5mm, Through Hole, 6 pin | E-SWITCH | 1 | Buy NowBuy Now |
| LED, Red, Through Hole, T-3 (10mm), 20 mA, 1.8 V, 640 nm | Clear Lens | 1 | Buy NowBuy Now |
| Board-To-Board Connector, 2.54 mm, 4 Contacts, Female-Receptacle, 1 Rows | Multicomp | 10 | Buy NowBuy Now |
| Board-To-Board Connector, 2.54 mm, 4 Contacts, Male-Header, 1 Rows | Multicomp | 2 | Buy NowBuy Now |
| 9V battery snap, flexible | Multicomp | 1 | Buy NowBuy Now |
| Battery, 9 V, PP3, Alkaline | Pro Elec | 1 | Buy NowBuy Now |
Additional Parts:
| Product Name |
|---|
| Altoid Tins |
Top Comments
Nice episode.
When I started learning electronics back in the late 1960's, I purchased some surplus circuit boards that turned out to be Resistor-Transistor Logic (RTL) boards.
I learned about logic…
This is something I found, but did not make myself. Give it a try and let us know how it turns out!
I got the idea for the episode here. https://www.instructables.com/id/Logic-Gates-with-NPN-transistors/
But redrew all the schematics.