I am looking for a simple yes or no on “will this work?”:
I am building a PWM controller for light strips from DealExtreme. The strips come in both Common Anode (CA) and Common Cathode (CC) varieties depending on what is in stock at the moment… Aside from that, they use 12volts out of the box. Since I intend to buy these in quantity, I need my final product to be flexible…
To describe the fragment of my controller schematic attached:
RCHAN1 - PWM line from arduino Mega for Red LED’s Channel 1
GCHAN1 - PWM line from arduino Mega for Green LED’s Channel 1
BCHAN1 - PWM line from arduino Mega for Blue LED’s Channel 1
RCHAN2, etc… Channel 2 Blah Blah Blah (same as channel 1)
From the above lines, a 2N2222 is triggered, further switching TIP120’s setup to drive 12 Volt lines of either CA or CC.
So, Will it work?
Almost forgot, on the Common Anode half, the LED strip’s +12 is connected to +12, and on the Common Cathode hale, the LED strip’s GND is connected to GND. Also, the ROUT,GOUT,BOUT, etc, are broken out to screw terminals in my proposed design, along with GND/+12