Hi guys,
Sorry I haven't been around for a while, I was very busy during most of the school year and had no time for electronics. But now im free.
I am driving 3 7x5 dot matrix's(21 rows x 5 columns) with 3 4017 counters for the rows and a AVR uc for the columns. The leds become dimmer as more turn on. I knew that this would happen and its was not a problem while testing. Now I am designing a PCB and need some help adding a few transistor. I think that the best place to put some transistors is on the columns, but so far I cant get them to work. I need some advice.
Circuit http://arthur92710.byethost31.com/elec/757hrmatrix.bmp
Matrix http://arthur92710.byethost31.com/elec/dotmatrix.bmp
*EDIT* copy the links into your browser, host is giving a linking error.
Thanks guys.
Sorry I haven't been around for a while, I was very busy during most of the school year and had no time for electronics. But now im free.
I am driving 3 7x5 dot matrix's(21 rows x 5 columns) with 3 4017 counters for the rows and a AVR uc for the columns. The leds become dimmer as more turn on. I knew that this would happen and its was not a problem while testing. Now I am designing a PCB and need some help adding a few transistor. I think that the best place to put some transistors is on the columns, but so far I cant get them to work. I need some advice.
Circuit http://arthur92710.byethost31.com/elec/757hrmatrix.bmp
Matrix http://arthur92710.byethost31.com/elec/dotmatrix.bmp
*EDIT* copy the links into your browser, host is giving a linking error.
Thanks guys.
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