Whoops! We forgot to post this up on Friday! If you want to control our RGB LED strips, you’ll need to control a pretty big amount of current, a few Amps or so. Small transistors like a 2n2222 can only handle maybe 0.1 Amps so we need to step it up and go for a big packaged transistor such as a TO-220 type. These are much larger and have a heat sink tab. By themselves the packages can dissipate about 2 Watts, but you can connect up a heatsink easily.
It can control 60V, at 16 Amp max with a fairly good RdsOn of 0.09 ohm. That means that you can control at least 5 Amps without needing a heatink (more if the switch isn’t on all the time). They also have a threshhold of 2.5V so you can connect the gate directly to 3.3V logic
You can pick them up for about a buck at nearly any electronics supplier.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Sorry, the comment form is closed at this time.