Schmitt trigger circuit inputs a wavering analog signal and outputs a distinct digital (solidly on or off) signal. I use a couple 2N2222 NPN Bipolar Junction Transistors wired as a Schmitt trigger controlled by a trimmer potentiometer trimpot based voltage divider on a prototype breadboard and a diagram I put together to demonstrate and explain the basics.
Diagram used in video posted to my Twitter [ Ссылка ]
Transistor circuit 1 NPN BJT 2N2222 switch for beginner DIY electronics hobbyists [ Ссылка ]
Transistor circuit 2 PNP BJT 2N3906 switch for beginner DIY electronics hobbyists [ Ссылка ]
Transistor circuit 3 2N3904 NPN BJT wired as NOT Gate signal inverter explained [ Ссылка ]
Transistor circuit 4 two NPN BJTs 2N2222 pulse generator circuit beginner DIY electronics hobbyists [ Ссылка ]
Transistor circuit 5 Trimpot voltage divider controlled NPN 2N3904 PNP BJT 2N3906 DIY electronics [ Ссылка ]
Transistor circuit 6 2N2222 NPN Bipolar Junction Transistor BJT Constant Current Source [ Ссылка ]
Transistor circuit 7 AND gate switches 2N2222 NPN BJT and SN74HC08N quad 2 input pos AND gates [ Ссылка ]
Transistor circuit 8 NAND gate switches 2N2222 NPN BJT and SN74HC00N quad 2 input NAND gate IC [ Ссылка ]
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