Andres Rodriguez
New Member
The photo shows an RC airplane propeller with a number of surface mounted LEDs. The purpose is to create a POV sign as the propeller rotates.
The problem is that I soldered the LEDs with a common cathode. I did this before I realised that the total current would exceed the max tolerated by the 28X1. To handle the current I added the ULN2803 (see attached schematic) and now I don't think that the common cathode set-up will work.
If there is a way to avoid reworking the propeller I would appreciate your input.
I thank you in advance
The problem is that I soldered the LEDs with a common cathode. I did this before I realised that the total current would exceed the max tolerated by the 28X1. To handle the current I added the ULN2803 (see attached schematic) and now I don't think that the common cathode set-up will work.
If there is a way to avoid reworking the propeller I would appreciate your input.
I thank you in advance
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