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| Image | Part # & Datasheet | Description | Distributor | 
|---|---|---|---|
      | PN2222 |  General purpose NPN - EBC  30V to 40V, 600 mA to 1 A Complement of PN2907 DIFFERENT PINOUT THAN P2N2222!  | Mouser Digikey | 
| " | P2N2222 |  General purpose NPN - CBE  40V 600 mA DIFFERENT PINOUT THAN PN2222!  | Mouser Digikey | 
| " | PN2907 |  General purpose PNP - EBC  40 V 800 mA Complement of PN2222  | Mouser Digikey | 
| " | 2N4401 |  General purpose NPN - EBC  40V 500 mA Complement of 2N4403  | Mouser Digikey | 
| " | 2N4403 |  General purpose PNP - EBC  40V 500 mA Complement of 2N4401  | Mouser Digikey | 
| " | 2N3904 |  General purpose NPN - EBC  40V 100 mA Complement of 2N3906 Lower noise than many general purpose NPN  | Mouser Digikey | 
| " | 2N3906 |  General purpose PNP - EBC  40V 100 mA Complement of 2N3904 Lower noise than many general purpose PNP  | Mouser Digikey | 
| Image | Part # & Datasheet | Description | Distributor | 
|---|---|---|---|
           | TIP120 | Common Darlington high-power transistor | Mouser Digikey | 
           | ULN2003(TI) |   7-element common-collector Darlington array  ULN2003 has 2.7k input resistors for 5V driving voltage ULN2004 has 10.5k input resistors for 6-15V driving voltage Output clamp diodes included for driving inductive loads  | Mouser Digikey | 
| Image | Part # & Datasheet | Description | Distributor | 
|---|---|---|---|
      | ZVP3306 |   P-Channel MOSFET  General purpose low-power  | Digikey | 
       | STP16NF06 or STP16NF06: |   N-channel Power MOSFET  General purpose power FET 60V @ 16A with 90 mOhm Rdson  | Digikey Mouser | 
      | Vishay IRFD110PBF | N-Channel 100V HEXFET | Digikey Mouser |