With all the controls at half, except the Depth, which is dimed, my Circulator has these results
IC3 Voltage readings
pin 3 - fluctuates up and down from 0.8v to 6v in a regular frequency
pin 4 - same as above but range is 1.5 to 4.8v
pin 5 - same as above but range is 2.4 to 6.0v
IC5 voltage...