Hi
I have designed a digital led clock using 89s52 mic. and pcf 8583p rtc chip. I use a total of 6 digit for HH:MM :SS format. I use here normal multiplexed display technic in which only one digit is active at any instence. It is common cathode type display. and each sigment is made up with 12 leds(4x3led serese) . a uln 2003 driver is used as cathode driver and 7 anodes are being driven by 7 pnp transistors..The clock is running ok, brightness also ok.but some sigments are slightly lit
unexpectedly according to active sideby digit. I use some software as well as hardware tricks to solve it but all in vain.Please
help me.
I have designed a digital led clock using 89s52 mic. and pcf 8583p rtc chip. I use a total of 6 digit for HH:MM :SS format. I use here normal multiplexed display technic in which only one digit is active at any instence. It is common cathode type display. and each sigment is made up with 12 leds(4x3led serese) . a uln 2003 driver is used as cathode driver and 7 anodes are being driven by 7 pnp transistors..The clock is running ok, brightness also ok.but some sigments are slightly lit
unexpectedly according to active sideby digit. I use some software as well as hardware tricks to solve it but all in vain.Please
help me.