Which is better? Why?But some of them are OK, but they don't have 138. Do you have 138? Which one is better?
138 decoding drive 4953, three input ABC, you can control 8 lines at most.
You can drive 4953 without 138, and the signal is directly connected to 4953. But an input signal can only control one line, and now the LED display is rarely used this way.
138 is the 3-8 decoder, so: to 16 scan, you must have 16 scanning lines, then line input a, B, C, D four lines, must use 2 138 to decode into 16 lines; and so on, 2 sweep above must be decoded. But if it's a static scan, it doesn't seem necessary to decode it So there is no 138.
