Counters and Timers - Electronic Circuits Projects Diagrams Free

Nanya · 9th December 2006, 09:29 PM

Hi Guys,

I was given this project at school that uses the 555timer, 7490 counter chip, 7448 BCD decoder and the common cathode seven segement display. After all the connections on the bread board... my output was just the digit 8 but this was not the desired output which is a display of digits 0-9.

Please if anyone has done a project using timers and counters, can you help me out here.

Thanks.

ljcox · 9th December 2006, 09:42 PM

Have you searched this forum for "counter" or "timer".

There have been plenty posted in the past. Study those and then ask more questions if you need to.

eblc1388 · 10th December 2006, 08:57 AM

On 7448, besides connecting pin 1,2,6 & 7 to 7490, you'll need to connect pins 3,4 and 5 to +5V too.

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9th December 2006, 09:29 PM	(permalink)
Nanya	Counters and Timers Hi Guys, I was given this project at school that uses the 555timer, 7490 counter chip, 7448 BCD decoder and the common cathode seven segement display. After all the connections on the bread board... my output was just the digit 8 but this was not the desired output which is a display of digits 0-9. Please if anyone has done a project using timers and counters, can you help me out here. Thanks.

9th December 2006, 09:42 PM	(permalink)
ljcox	Have you searched this forum for "counter" or "timer". There have been plenty posted in the past. Study those and then ask more questions if you need to. __________________ Len

10th December 2006, 08:57 AM	(permalink)
eblc1388	On 7448, besides connecting pin 1,2,6 & 7 to 7490, you'll need to connect pins 3,4 and 5 to +5V too. __________________ L.Chung Last edited by eblc1388; 10th December 2006 at 09:05 AM.