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tpic6b595 shift register
It is generally a bad idea to make general statements :-). There are times when it is better not to multiplex the display. If you are building a large display, it is a bad idea to multiplex as you now have to distribute many high voltage/high current signals over large...
Re: 5x7 Matrix and driver
I am sure that you can connect the controllers to a PIC or AVR. You should look at the **broken link removed** for information.
Re: voice changer
Issue #187 of Circuit Cellar Magazine had an article **broken link removed** by
Aviad Bechori, Shlomo Engelberg, & Roi Rapoport. This should provide you some background. You do not specify which PIC you intend on using. I suggest that you look up some of the DSPic...
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