Quad-7segment display (again)

Armagon

Member
Deal all:

Some weeks ago, I built a Quad-7segment display, I used 4 digits (18mm), the pins are multiplexed, 8 pines for segments and 4 pines for common anodes, and it worked excellent, but now I tried to build the same display with a big display 25mm and the intensity is very low, Could someone explain me how can increase the intensity?
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moxhamj

New Member
I wonder if no-one is answering because the circuit is incomplete.

Can you please repost the pdf with higher resolution and without the bottom bit cut off. Also can you indicate what is connected to the jumpers. Is it a picaxe or a led driver chip or transistors or something else?

If it is a picaxe, the 150 ohm resistors are not going to work. It will overload the picaxe. There are lots of solutions - dedicated driver chips etc, but the bottom line is you need more current to each led. I wouldn't go much under 1k for each led on a picaxe. Sure you can go down to 220 ohms for one led, but once you try to drive lots of them the chip overloads.

If you can post the full circuit diagram we can work out a better solution.
 
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