I'm building a circuit that reads from the BCD input of a 7-segment decoder.
I'm using LE as the trigger to the PIC16F84 to capture the BCD code. Problem
is when I connect to the input of the BCD chip 4511 the 7-segment display
flickers and displays wrong digits, I tried using a opto-isolator and an
Op-amp 741( as Unity Gain Follower) but the display I'm reading from is
still affected by branching the trigger to my circuit, circuit works OK on
breadboard with clock for trigger. Anyone any ideas?

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