A syncronous counter based on 555 timing IC.
A complete circuit that clocks with 555 IC and a syncronous counter that counts up based on the clock output from 555 IC.
Switch is added in circuit to freeze the capacitor from discharging and using push button clock the 555 IC when needed. Provides interupt to 555 IC and manually clock the IC. Syncronous counter will count up from 0 to 7 based on how fast 555 IC clocks (Speed of 555 IC can be changed with potentiometer.)
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