![]() I was multiplexing like the first schematic attached (pic1) and multiplexing with code that looked like this: //set all pins connected to the cathodes high ![]() But obviously something else is my problem. (since it seems to contradict the manufacturer's datasheet)Ĭan you please help us understand how you came to be saying this ? That doesn't sound like a very informed conclusion. I'm not sure but I think I realized that these transistors are not able to switch fast enough. What is the basis of your conclusion that the transistors can't switch fast enough ? If you were switching a laser diode for communication purposes it would be relevant. I assume you realize there is no point in switching leds fast for human observation. Do you have any prior electronics experience ? Do you have a scope ?ĮXACTLY HOW are you measuring the rise time if you don't have a scope or any other means of measuring it ? Are you using an arduino to measure it ? If so, how ? (analog, digital ?) Obviously, if you are using a 30nS device and reporting a much long rise time, something is not adding up. Post your circuit schematic and if applicable your code. Am I right in saying that? or is that just stupid? If so, can anyone point me in the right direction as to what transistors might be faster?Īs mentioned, your post is not consistent with the datasheet for the devices. Like they can, but it would be much better if I had faster switching transistors. Ok, so I was using 2n4401 npn transistors for this project I'm working on but I am using them to switch LEDs on and off really really fast. ![]()
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