Problems with the 4511b IC chip??

SO i made a circuit which is a binary adder(using the 4008b) that adds numbers in binary and then passes on the result to a 4511 IC(its a BCD to 7 segment decoder),so basically it adds numbers in binary and displays them in decimal .It seemed to work fine for a while but then suddenly when i tried adding 0011 +0001(3+1) in binary ,it still displayed 0 and then i tried tapping the battery for a second or two and then suddenly the seven segment display shows 4 .The circuitry is all fine and right .but do i have to connect latch enable(pin 5) pin of the Ic?.Both the IC's run on a 9v battery and for the 4511 decoder IC i used 33k pull down resistor .Is my pull down resistor value for the 4511 IC too high ?The binary adder part seems to work very well,its the bcd to 7 segment decoder IC part that I'm very much concerned about.Is there too less power for both the chips to run on?I've not got a single idea at all .so, >PLS help me if you can.

Question by Strontium   |  last reply


Problems with my arduino mini shield

So i built an arduino mini shield for displaying numbers(i used the 4511 bcd to 7 segment decoder ic ) using only 4 pins excluding v+ and v-(power).It seemed to work well for while but later when i tried displaying 0001 ( 1 in binary) ,it suddenly stopped working or some all the segments got dimly lit . .Also if i plug it into the breadboard and connect some jumpers to the pins of the arduino(+5v and gnd) ,it seems to work fine,however when i plug it directly into the arduino,setting pin13 high and the gnd pin near it ,it does'nt work properly and all the segments glow dimly.The control pins for the digits are pin 12,11,10 and 9.also when i plug it into the breadboard and instead of connecting the pins with jumpers to +5v and gnd of the arduino,if i connect it to pin 13(HIGH) and the gnd near it it displays only 8, also can't i use pin 13 being HIGH as 5v' s? WHAT AM  I SUPPOSED TO DO?

Question by Strontium   |  last reply