I encountered no problems building the circuit and with the low current LED the output was clearly visible. The only detail that puzzles me is that the 74LS92 counter has a Clock input B (pin 1) and Clock input A (pin 14). The output from the 555 chip (pin 3) is connected to Clock input A nevertheless Clock input B needs to be connected to Binary output A (pin 12) of the 74LS92 counter. Anyway everything works fine.
Breadboard with the binary counter. The 74LS92 counter (left) is triggered once every second by the 555 chip. The three LED on the left indicated the output from the counter. |
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