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CD4047 mono/astable multivibrator

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uceesdp

New Member
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
 
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.
 
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