I have an NPN type Tip31c transistor wired up to control a 12v load at .5 amps(max) from an Arduino Uno Pin. The load is signal amplifier for tv. There is the appropriate resistor between the transistor base and Arduino pin. The circuit works just as intended with no issues but after reading around some I discovered that maybe I should add a capacitor to help. However, i am unsure really what the capacitor does and where to add it(is between GND and the corresponding Arduino pin correct)? And what is the appropriate value for the capacitor? I have read multiple different things. I have multiple 104, 103, and 1 101 valued capacitors if needed. Thank You
Update: I am unsure of the resistor added as It is in heat shrink... multi-meter reads it as 555 ohms. The first diagram is the currently working circuit and the second is the proposed with a capacitor.