PART FINDER FRIDAY – Small signal BJT! We’re continuing our tradition of showcasing the useful basics that everyone needs to have in their shop. Today we’ll be talking about the PN2222 (NOT to be confused with the P2N2222) NPN transistor. This is our ‘go to’ every-day NPN transistor. Its pin compatible with the the also-popular 2n3904 but with more current capability. It’s been great in the TV-B-Gone kit for pulsing the IR LEDs. You can use it to drive small motors, relays, or solenoids, audio amplification, level shifting, etc etc.
As far as small-signal transistors go, this is a good one to keep stocked up on so we suggest buying 25 or so.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.