types
- ref - https://www.censtry.com/blog/transistor-npn-vs-pnp-difference-between-pnp-and-npn-transistor.html
common used
S8050
-
relay-dat drive
-
S8050 SOT-23 footprint = BC817
| pin | name | common |
|---|---|---|
| 1 | base | io input |
| 2 | emittor | gnd |
| 3 | collector | output |
