ericmar
Full Member level 5
sn74ls47 circuit
Hi all,
I hv problem using this IC. For some reason, it just doesnt drive out enough output voltage or current to light up the 7 segments LED.
I supplied +5V an +7V but both dont work. With +5V, I'm getting Output voltage: 0.11V (for HIGH), 0.03V (for LOW), and Output current: 1.42mA (for HIGH), 0mA (for LOW).
Can anyone help me? I try to search from the web but some of them just simply connect to the 7 segments LED and it seems to be working but not for me! I hv no idea with the Open collector output too. I did try to use 2k ohm as a pull-up resistor but it fails too!
I really need help in urgent! So pls do help me if u know how to use this IC!
Thanks a lot!
Regards,
Eric
Hi all,
I hv problem using this IC. For some reason, it just doesnt drive out enough output voltage or current to light up the 7 segments LED.
I supplied +5V an +7V but both dont work. With +5V, I'm getting Output voltage: 0.11V (for HIGH), 0.03V (for LOW), and Output current: 1.42mA (for HIGH), 0mA (for LOW).
Can anyone help me? I try to search from the web but some of them just simply connect to the 7 segments LED and it seems to be working but not for me! I hv no idea with the Open collector output too. I did try to use 2k ohm as a pull-up resistor but it fails too!
I really need help in urgent! So pls do help me if u know how to use this IC!
Thanks a lot!
Regards,
Eric