Digimaniac
New Member
Hi Guys and Girls,
I am so glad to find such forum on the internet after about 4 days searching so I wish you can help me here.
First , I wannna inform you that I am a Student in The Faculty of Engineering here in Egypt but I have my own works too , So that's my first try to make my first Electronic Device, so forgive my unconscious mistakes in writing this topic.
Now I am trying to make a Digital clock using 555 to make a pulse , 7490 as a counter ,7447 as a BCD Decoder and a 7 segment displays.
Now I managed to make a units of the seconds I mean by the units the 0-9 part and went to make the tens part (0-5) but here is the problem as I can't force the 7490 to work as a 6 decade counter so please inform me on how to do with it and if you got any idea of R91,R92,R01 and R02 please tell me about them As I think that the problem is in joining those pins , Yours Aly
I am so glad to find such forum on the internet after about 4 days searching so I wish you can help me here.
First , I wannna inform you that I am a Student in The Faculty of Engineering here in Egypt but I have my own works too , So that's my first try to make my first Electronic Device, so forgive my unconscious mistakes in writing this topic.
Now I am trying to make a Digital clock using 555 to make a pulse , 7490 as a counter ,7447 as a BCD Decoder and a 7 segment displays.
Now I managed to make a units of the seconds I mean by the units the 0-9 part and went to make the tens part (0-5) but here is the problem as I can't force the 7490 to work as a 6 decade counter so please inform me on how to do with it and if you got any idea of R91,R92,R01 and R02 please tell me about them As I think that the problem is in joining those pins , Yours Aly