U uceesdp New Member Aug 13, 2010 #1 Hi all, just purchased the cd4047b ic and cannot get the monostable operation to work. i'm using a 33uf cap and 100k resistor for timing. pins 4,8,14 are connected to vdd and 5,7,9,12 are ground. i should be getting 8.125seconds but it remains on forever. can somebody help me? thanks
Hi all, just purchased the cd4047b ic and cannot get the monostable operation to work. i'm using a 33uf cap and 100k resistor for timing. pins 4,8,14 are connected to vdd and 5,7,9,12 are ground. i should be getting 8.125seconds but it remains on forever. can somebody help me? thanks
crutschow Well-Known Member Most Helpful Member Aug 14, 2010 #3 You need pin 4 connected to ground and pin 5 connected to vdd for astable operation. The bar over the astable label means it's an inverted command and must be low to be active.
You need pin 4 connected to ground and pin 5 connected to vdd for astable operation. The bar over the astable label means it's an inverted command and must be low to be active.
krytenrobot New Member Aug 14, 2010 #4 4047 info check the data sheet.. https://www.fairchildsemi.com/ds/CD/CD4047BC.pdf