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Difference Between Sn7447 And 7447pc, ss

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Fromtheinside	Posted: June 04, 2011 10:42 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	All i wanna know is the difference because i made a cirrcuit with 7447 pc and it doesnt work..

kellys_eye	Posted: June 05, 2011 12:13 am
Forum Addict ++ Group: Spamminator Taskforce Posts: 10,013 Member No.: 2,735 Joined: June 21, 2005	Datasheets? The generic 7447 should be identical - post your schematic and/or check for errors in construction. -------------------- May contain nuts

Fromtheinside	Posted: June 05, 2011 02:40 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	http://s1009.photobucket.com/albums/af220/...nt=SDC11073.jpg In EBW it works.. I verified it after mounting a thousand times, but still not working..

kellys_eye	Posted: June 05, 2011 02:56 pm
Forum Addict ++ Group: Spamminator Taskforce Posts: 10,013 Member No.: 2,735 Joined: June 21, 2005	Have you TESTED the circuit? Checked the logic levels at the ABCD inputs to the 7447? Checked the output levels? Where is the common connection for the display? -------------------- May contain nuts

Fromtheinside	Posted: June 05, 2011 06:44 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	Hmm the display is common cathode, i connected it on the ground, here's the foto: http://s1009.photobucket.com/albums/af220/...nt=SDC11075.jpg I can't find 7447PC on datashit.. and.. as you can see in the photo i didn't put the reset switch.. Can i check the logic levels with normal digital multimeter? This post has been edited by Fromtheinside on June 05, 2011 06:44 pm

Fromtheinside	Posted: June 05, 2011 06:54 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	I tested with multimeter: at the pin 9 of 7447 there is 0.03V, han i press the button, there is 0.04V than if i prass another one time thare is 0.03V again and also for other pins ABCDEFG what it means?

johansen	Posted: June 05, 2011 07:07 pm
Forum Addict ++ Group: Trusted Members Posts: 2,787 Member No.: 10,912 Joined: September 06, 2007	from the datasheet . Each segment output is guaranteed to sink 24 mA in the ON (LOW) state and withstand 15V in the OFF (HIGH) state with a maximum leakage current of 250 µA this means the display needs to be connected to the positive rail, not the grounds. it needs to be a common anode display. -------------------- Siriusly? Anyone paying attention knows it’s Apollyon 2112

Fromtheinside	Posted: June 05, 2011 07:57 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	OK, thanx a lot, now that i put common anode display it works fine..

CWB	Posted: June 06, 2011 11:40 am
Forum Addict ++ Group: Spamminator Taskforce Posts: 19,624 Member No.: 15,154 Joined: May 15, 2008	"I can't find 7447PC on datashit.. and.. " gotta love some of those typos ! -------------------- "Know how to solve every problem that has been solved" R. Feynman '88

Ice-Tea	Posted: June 06, 2011 12:35 pm
Forum Addict ++ Group: Spamminator Taskforce Posts: 2,897 Member No.: 462 Joined: October 07, 2003	What makes you think it is a typo? I can think of a few examples where "datashit" is entirely accurate

Fromtheinside	Posted: June 07, 2011 03:42 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	What means when there is little c on the display?

Gorgon	Posted: June 07, 2011 04:42 pm
Forum Addict ++ Group: Trusted Members Posts: 2,931 Member No.: 3,861 Joined: December 18, 2005	It is telling you that your inputs are 10 or A hexadecimal. You will get a different symbol for all the values from A-F.(10-15). These combinations is listed in the datasheet for the chip. TOK -------------------- Light travels faster than sound. That's why some people appear bright until they speak!

Fromtheinside	Posted: June 07, 2011 11:46 pm
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	Thanks guys, with your halp i finally completed check it out: http://www.youtube.com/watch?v=8r3PjwaMaWY

Nothing40	Posted: June 08, 2011 05:24 am
Forum Addict ++ Group: Spamminator Taskforce Posts: 3,306 Member No.: 181 Joined: October 05, 2002	Cool! You might want to de-bounce the manual switch though,it's sometimes counting multiple pulses per button press. -------------------- "we need an e-kick-in-the-nuts button" -Colt45

Fromtheinside	Posted: June 08, 2011 09:16 am
Newbie Group: Members+ Posts: 30 Member No.: 34,861 Joined: April 12, 2011	yeah, i know..

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