Pro tip: Use ULN2803 for the LED cathodes and UDN2981 for the Anodes. The UDN's can switch up to 50 volts I think. They contain 8 drivers in one chip and can be easily put right after the shift registers. The ULN chips sink up to 500 mA. They're basically like 8 transistors in one chip thaat can be hooked up to the microcontroller's ports or shift registers. Good luck!
Pro tip: Use ULN2803 for the LED cathodes and UDN2981 for the Anodes. The UDN's can switch up to 50 volts I think. They contain 8 drivers in one chip and can be easily put right after the shift registers. The ULN chips sink up to 500 mA. They're basically like 8 transistors in one chip thaat can be hooked up to the microcontroller's ports or shift registers. Good luck!
nrdesign1991 8 months ago
@nrdesign1991 Thanks, I needed to source 500 ma hence the 4017 and 7 x TIP120. I am not familiar with the UDN2981
bobdavis321 8 months ago
I'm happy to help. I used UDN2981's to switch 24 Volts DC with an ATMega32 microcontroller that can handle only 5 Volts DC. Works perfectly!
nrdesign1991 8 months ago