Transistor circuit 1 NPN BJT 2N2222 switch for beginner DIY electronics hobbyists https://youtu.be/IAyGYiBQExk Transistor circuit 2 PNP BJT 2N3906 switch for beginner DIY electronics hobbyists https://youtu.be/NjD7eUZIg1U Transistor circuit 3 2N3904 NPN BJT wired as NOT Gate signal inverter explained https://youtu.be/V8WIDmS_x9c Transistor circuit 4 two NPN BJTs 2N2222 pulse generator circuit beginner DIY electronics hobbyists https://youtu.be/mZXoAvbHxo8 Transistor circuit 5 Trimpot voltage divider controlled NPN 2N3904 PNP BJT 2N3906 DIY electronics https://youtu.be/F6psgJ1QSUQ Transistor circuit 6 2N2222 NPN Bipolar Junction Transistor BJT Constant Current Source https://youtu.be/fNiEFyYy36U Transistor circuit 7 AND gate switches 2N2222 NPN BJT and SN74HC08N quad 2 input pos AND gates https://youtu.be/_8rpTcDwj98 Transistor circuit 8 NAND gate switches 2N2222 NPN BJT and SN74HC00N quad 2 input NAND gate IC https://youtu.be/EkO0WD3Ba0I Transistor circuit 9 Schmitt Trigger 2N2222 NPN Bipolar Junction Transistors BJTs trimpot https://youtu.be/UzeM8cyCSy8 https://www.amazon.com/shop/electronzapdotcom for links to where I bought most of the things I use in my videos. Electronzap earns money from this storefront. https://www.patreon.com/electronzap If you'd like to support my efforts directly ... https://www.youtube.com/watch?v=Z6_BzfcgEvQ

Current source circuit. This circuit actually sinks current through a 2N3904 NPN bipolar junction transistor. But, the circuit sets a certain current through a load, so it is still commonly called a current source. PNP transistors make a more accurate current sources. https://www.youtube.com/c/electronzap https://www.amazon.com/shop/electronzapdotcom Electronzap earns money from this storefront and many of the links to products. https://www.patreon.com/electronzap https://www.twitch.tv/electronzap I now do my gaming, Fallout 4 for the time being, on Twitch. #2N3904 #current #electronics ... https://www.youtube.com/watch?v=VkHyp85vA6I