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Chineese led diaplay boards

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codename25

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Hi,
I would like to know how these Chinese led sign board is made.
1. How many rows of shift registers are used in a led board.?
2. Whether I can connect ONBON LED CONTROLLER with my home made led board with one set row of shift registers?

Thank you.
 

schmitt trigger

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For these instances, where the information is very scarce, the best approach is to contact the vendor or vendors directly, and ask the exact same question.
 
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deniah

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I do not know for RGB model, but for single color 16 x 32 dot chinese led modul there is 16 pcs of 74hc595 (1/4 refresh). Each panel have 74hc245 buffer on data, clk, latch and enable line. There is one NOT gate, i think on enable line, hc138 decoder and 8 pcs dual p-channel fet transistors in SOP8 package for driving rows
 

codename25

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Thank you deniah, I have a doubt why they use 74HC245? Also why for 16 rows only 8 pcs of get transistor is used?
 

wavelet1208

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1.The 74HC245 used to filter,Signal amplification.
2.Maybe there has two channel rgb signal,so just need 8pcs
 

deniah

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There is actually two fets in one SOP8 package. Search for FDS4953 datasheet.
 

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